Roller compacted water-resistant foamed asphalt concrete and method for producing the same

Abstract

The present application belongs to the technical field of building materials, and particularly relates to a roller compacted and cured water-resistant foamed asphalt concrete and a preparation method thereof. The roller compacted and cured water-resistant foamed asphalt concrete comprises the following components: foamed asphalt, aggregate, cement, lime, fiber, glue powder, unsaturated polyester, silane coupling agent, initiator microcapsule and accelerator microcapsule. The roller compacted and cured water-resistant foamed asphalt concrete retains the workability, environmental protection and application performance advantages of foamed asphalt concrete, and realizes the roller compacting and curing of the foamed asphalt concrete by using the microcapsule technology. That is, the foamed asphalt concrete does not undergo a chemical curing reaction during storage, transportation and paving; during the molding process, the stones are extruded to each other by the roller compacting of the road construction equipment, so that the initiator microcapsule and the accelerator microcapsule are broken, and the unsaturated polyester in the mixture undergoes a curing reaction with the initiator and the accelerator.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of building materials, and particularly relates to a roller compacted curing type water-resistant foamed asphalt concrete and a preparation method thereof. BACKGROUND

[0002] At present, the asphalt pavement of road construction mainly adopts hot-mixed asphalt mixture to form hot-mixed asphalt concrete pavement after being compacted. The production of hot-mixed asphalt mixture needs to heat the asphalt and aggregate to above 160 DEG C, and then mix at high temperature. The temperature of the mixed material is generally required to be not less than 150 DEG C. The compacting process has strict requirements on the compacting temperature. If the temperature of the hot-mixed asphalt mixture is too low or too high, the compacting quality will be defective, and then the quality of the asphalt concrete pavement will be defective. Most importantly, the hot-mixed asphalt concrete needs to consume a large amount of energy and emit CO2, asphalt smoke and other waste gas during the mixing process, which causes environmental pollution and harms the health of the surrounding personnel. The foamed asphalt technology is a relatively green and environmentally friendly new technology.

[0003] The foamed asphalt technology is to add cold water into hot asphalt. Due to the high temperature of the hot asphalt, the water is instantaneously vaporized, the volume of the asphalt is instantaneously increased to become foamed asphalt, the viscosity of the asphalt is reduced, and the workability of the asphalt mixture is improved.

[0004] The foamed asphalt concrete is a stable structure formed after foamed asphalt mixture is compacted. Compared with the hot-mixed asphalt mixture, the foamed asphalt mixture only needs to heat the asphalt, and the stone does not need to be heated, which can save a large amount of resources. After the foamed asphalt mixture is mixed, it can be immediately compacted, and the traffic can be opened after the compaction is completed, so the construction period can be greatly shortened. The foamed asphalt mixture can be stored for about one month without affecting its performance, which can be very convenient for application in daily road maintenance. The foamed asphalt concrete increases the shear strength of the granular material and reduces the water sensitivity of the granular material. The strength characteristics are close to those of cement, lime and other stabilizing materials (semi-rigid materials), and have flexibility and good fatigue resistance. The use of the foamed asphalt concrete to replace semi-rigid materials for paving the base of the road can effectively reduce the reflection cracks.

[0005] The foamed asphalt concrete has good structural strength and its performance can meet the application requirements of the road base. It is generally used for the road base. However, compared with the hot-mixed asphalt concrete, the foamed asphalt concrete has larger porosity and poorer wear resistance. Although the overall strength is good, it is easy to be locally damaged. The water stability is poor, and the performance decreases obviously after being eroded by water. Therefore, the foamed asphalt concrete is generally not used as the upper layer directly contacting the tire.

[0006] Foamed asphalt mixture has better workability than hot-mixed asphalt mixture, can be constructed under the condition of 20-30℃ lower than traditional hot-mixed asphalt mixture, can make up for the defects of reduced road performance of hot-mixed asphalt concrete caused by temperature loss, can be stored for a long time after mixing (sealed storage, prevent moisture loss) without losing performance, has the advantages of reducing energy consumption, reducing emissions, saving cost, widening construction season, etc.

[0007] According to the characteristics of foamed asphalt concrete, researchers have conducted extensive research. The invention patent application with application number 202010474671.7 discloses a method for improving the performance of foamed asphalt cold recycling mixture by using water-based epoxy resin as a cold mixing external agent to improve the performance of foamed asphalt recycling mixture. According to the description, this method can improve the water damage resistance of foamed asphalt recycling mixture by about 10%, and improve the high-temperature stability by 30%-50%. However, this method requires strict control of the transportation time of the mixture. The transportation time at room temperature should be within 45 minutes. If the temperature is too high or too low, the transportation time should be controlled within 30 minutes. This point actually destroys the advantage of long storage period and convenient and flexible use of foamed asphalt mixture. Even a 40-minute transportation time is very demanding for construction, and it is difficult to achieve in actual engineering applications. The main reason is that water-based epoxy asphalt will start to react after being prepared. If the transportation time is too long, the water-based epoxy resin will complete most or even all of the reaction. At this time, the three-dimensional network structure of the water-based epoxy resin that has been solidified and formed will be irreversibly damaged, which will actually reduce the performance of foamed asphalt concrete.

[0008] The invention patent with application number 201610487737.2 discloses a foamed asphalt mixture and a preparation method thereof. According to the description, the foamed asphalt mixture prepared by the invention has the characteristics of green and environmental protection, and can completely wrap the surface of the stone to form an asphalt film, and has good stability. However, in fact, the right requirements clearly state that "foamed asphalt 2.5 parts by weight to 8.5 parts by weight, aggregate 5 parts by weight to 100 parts by weight…". This invention replaces hot asphalt with foamed asphalt based on traditional hot-mixed asphalt mixture, and obtains foamed asphalt concrete with good performance. Since the oil-stone ratio has reached the specification requirement of traditional hot-mixed asphalt concrete, it is reasonable that the performance of the concrete is excellent. SUMMARY

[0009] In order to solve the defects of poor wear resistance and poor water stability of foamed asphalt concrete, and enable it to be directly applied to the upper layer of asphalt pavement, the present application provides a rolling and curing type water-resistant foamed asphalt concrete and a preparation method thereof.

[0010] The technical scheme of the present application is: a roller compacted and cured water-resistant foam asphalt concrete, comprising the following components by weight:

[0011] foam asphalt 1.8-3.5 parts, aggregate 99-101 parts, cement 0.1-1.8 parts, lime 0.5-1.5 parts, fiber 0.1-0.5 parts, glue powder 2.5-8.5 parts, unsaturated polyester 2.5-8.5 parts, silane coupling agent 0.5-3 parts, initiator microcapsule 2.5-8.5 parts, and accelerator microcapsule 2.5-8.5 parts;

[0012] The preparation of the initiator microcapsule comprises the following steps:

[0013] In the first step, the initiator is frozen into a solid in an environment of-10-20℃, and then crushed and sieved to obtain solid initiator particles of 0.3-2.36 mm;

[0014] In the second step, the solid initiator particles obtained in the first step are placed in a saturated rosin ethanol solution in an environment of-10-20℃, and then mixed, dispersed, filtered, and air-dried to obtain rosin-coated initiator particles;

[0015] In the third step, the rosin-coated initiator particles obtained in the third step are mixed with cement in a normal temperature environment, and cement-coated initiator particles are separated out;

[0016] In the fourth step, water is sprayed on the cement-coated initiator particles obtained in the third step in a normal temperature environment, and the cement is solidified and hardened to obtain initiator microcapsules;

[0017] The preparation of the accelerator microcapsule comprises the following steps:

[0018] In the first step, the accelerator is frozen into a solid in an environment of-10-20℃, and then crushed and sieved to obtain solid accelerator particles of 0.3-2.36 mm;

[0019] In the second step, the solid accelerator particles obtained in the first step are placed in a saturated rosin ethanol solution in an environment of-10-20℃, and then mixed, dispersed, filtered, and air-dried to obtain rosin-coated accelerator particles;

[0020] In the third step, the rosin-coated accelerator particles obtained in the third step are mixed with cement in a normal temperature environment, and cement-coated accelerator particles are separated out;

[0021] In the fourth step, water is sprayed on the cement-coated accelerator particles obtained in the third step in a normal temperature environment, and the cement is solidified and hardened to obtain accelerator microcapsules.

[0022] The curing initiator is tert-butyl hydroperoxide, the curing accelerator is dodecyl mercaptan, the aggregate is one of new stone, building solid waste recycled aggregate, and asphalt mixture recycling material (RAP), and the building solid waste recycled aggregate is recycled stone formed after waste concrete blocks are crushed, screened, washed, and dried.

[0023] The preparation method of the roller compacted and cured water-resistant foam asphalt concrete comprises the following steps:

[0024] In the first step, the aggregate, cement, lime, fiber, powder, unsaturated polyester, and silane coupling agent are uniformly mixed;

[0025] In the second step, water is added to the uniformly mixed materials in the first step, and the mixture is uniformly mixed again;

[0026] In the third step, foam asphalt is added to the mixture obtained in the second step, and the mixture is uniformly mixed again;

[0027] In the fourth step, initiator microcapsules and accelerator microcapsules are added to the mixture obtained in the third step, and the mixture is uniformly stirred to obtain a roller compacted and cured water-resistant foam asphalt mixture;

[0028] In the fifth step, the roller compacted and cured water-resistant foam asphalt mixture obtained in the fourth step is subjected to paving and rolling at the construction site to obtain a roller compacted and cured water-resistant foam asphalt concrete.

[0029] The roller compacted and cured water-resistant foam asphalt concrete retains the workability, environmental protection, and application performance advantages of foam asphalt concrete, and realizes the roller compacting and curing of foam asphalt concrete by using the microcapsule technology. That is, the foam asphalt concrete does not undergo a chemical curing reaction during storage, transportation, and paving; during the molding process, the stone is pressed against each other through the rolling of the road construction equipment, so that the curing agent microcapsules and the accelerator microcapsules are broken, and the unsaturated polyester in the mixture reacts with the curing agent and the accelerator.

[0030] Compared with the traditional RAP foam asphalt concrete, the roller compacted and cured water-resistant foam asphalt concrete has an increase of 12.2% in the un-frozen and thawed splitting strength, an increase of 21.5% in the frozen and thawed splitting strength, an increase of 8.4% in the frozen and thawed splitting strength ratio, an increase of 44.5% in the Marshall stability, and an increase of 5.2% in the residual stability, and the frozen and thawed splitting strength ratio and the residual stability reach the technical requirements of new stone hot mix asphalt concrete. DETAILED DESCRIPTION

[0031] Example 1

[0032] The roller compacted and cured water-resistant foam asphalt concrete described in this example comprises the following weight components:

[0033] Foamed asphalt 3.5 parts, aggregate (new stone) 101 parts, cement 0.1 part, lime 0.5 part, fiber 0.1 part, rubber powder 2.5 parts, unsaturated polyester 2.5 parts, silane coupling agent 0.5 part, initiator (tert-butyl hydroperoxide) microcapsule 2.5 parts, accelerator (dodecyl mercaptan) microcapsule 2.5 parts;

[0034] The preparation of the initiator microcapsule comprises the following steps:

[0035] Firstly, the initiator is frozen into solid at-10℃ to-20℃, and then crushed and sieved to obtain solid initiator particles of 0.3mm to 2.36mm,

[0036] Secondly, the solid initiator particles obtained in the first step are placed in a saturated rosin ethanol solution at-10℃ to-20℃, and stirred, dispersed, filtered and air-dried to obtain rosin-coated initiator particles,

[0037] Thirdly, the rosin-coated initiator particles obtained in the third step are placed in cement at room temperature and stirred to separate out cement-coated initiator particles,

[0038] Fourthly, water is sprayed on the cement-coated initiator particles obtained in the third step at room temperature to cure and harden the cement, and initiator microcapsules are obtained;

[0039] The preparation of the accelerator microcapsule comprises the following steps:

[0040] Firstly, the accelerator is frozen into solid at-10℃ to-20℃, and then crushed and sieved to obtain solid accelerator particles of 0.3mm to 2.36mm,

[0041] Secondly, the solid accelerator particles obtained in the first step are placed in a saturated rosin ethanol solution at-10℃ to-20℃, and stirred, dispersed, filtered and air-dried to obtain rosin-coated accelerator particles,

[0042] Thirdly, the rosin-coated accelerator particles obtained in the third step are placed in cement at room temperature and stirred to separate out cement-coated accelerator particles,

[0043] Fourthly, water is sprayed on the cement-coated accelerator particles obtained in the third step at room temperature to cure and harden the cement, and accelerator microcapsules are obtained.

[0044] The specific preparation method of the roller compacted and cured water-resistant foamed asphalt concrete comprises the following steps:

[0045] Firstly, the aggregate, cement, lime, fiber, rubber powder, unsaturated polyester, and silane coupling agent are uniformly mixed;

[0046] Second step, add water to the first step of the mixture and continue to mix evenly;

[0047] Third step, add foamed asphalt to the second step of the mixture and continue to mix evenly;

[0048] Fourth step, add initiator microcapsules and accelerator microcapsules to the third step of the mixture and mix evenly to obtain a roller compacted and cured water-resistant foamed asphalt mixture;

[0049] Fifth step, the roller compacted and cured water-resistant foamed asphalt mixture obtained in the fourth step is rolled and compacted on site to obtain a roller compacted and cured water-resistant foamed asphalt concrete.

[0050] Example 2

[0051] The roller compacted and cured water-resistant foamed asphalt concrete described in this example comprises the following components by weight:

[0052] Foamed asphalt 2.2 parts, aggregate (new stone) 100 parts, cement 0.3 parts, lime 0.6 parts, fiber 0.3 parts, rubber powder 3.5 parts, unsaturated polyester 3.5 parts, silane coupling agent 1.5 parts, initiator (tert-butyl hydroperoxide) microcapsules 3.5 parts, accelerator (dodecyl mercaptan) microcapsules 3.5 parts;

[0053] The preparation of the initiator microcapsules comprises the following steps:

[0054] First step, freeze the initiator into a solid at -10°C to -20°C, then crush and sieve to obtain solid initiator particles of 0.3mm to 2.36mm,

[0055] Second step, place the solid initiator particles obtained in the first step in a saturated rosin ethanol solution at -10°C to -20°C, mix, disperse, filter, and air dry to obtain rosin-coated initiator particles,

[0056] Third step, place the rosin-coated initiator particles obtained in the third step in cement at room temperature and mix, separate out the cement-coated initiator particles,

[0057] Fourth step, sprinkle water on the cement-coated initiator particles obtained in the third step at room temperature to cure and harden the cement, and obtain initiator microcapsules;

[0058] The preparation of the accelerator microcapsules comprises the following steps:

[0059] First step, freeze the accelerator into a solid at -10°C to -20°C, then crush and sieve to obtain solid accelerator particles of 0.3mm to 2.36mm,

[0060] Second step, in the environment of-10℃ to-20℃, the solid accelerator particles obtained in the first step are put into the saturated rosin ethanol solution, mixed, dispersed, filtered and air-dried to obtain rosin-coated accelerator particles,

[0061] Third step, in the normal temperature environment, the rosin-coated accelerator particles obtained in the third step are put into the cement and mixed to separate out the cement-coated accelerator particles,

[0062] Fourth step, in the normal temperature environment, water is sprinkled on the cement-coated accelerator particles obtained in the third step for curing, so that the cement is solidified and hardened to obtain the accelerator microcapsules.

[0063] A preparation method of a roller compacted and cured water-resistant foam asphalt concrete, comprising the following steps:

[0064] First step, the aggregate, cement, lime, fiber, rubber powder, unsaturated polyester and silane coupling agent are mixed uniformly;

[0065] Second step, water is added to the uniformly mixed materials in the first step and continues to be mixed uniformly;

[0066] Third step, foam asphalt is added to the materials obtained in the second step and continues to be mixed uniformly;

[0067] Fourth step, initiator microcapsules and accelerator microcapsules are added to the materials obtained in the third step, and a roller compacted and cured water-resistant foam asphalt mixture is stirred uniformly;

[0068] Fifth step, the roller compacted and cured water-resistant foam asphalt mixture obtained in the fourth step is subjected to paving and rolling at the construction site to obtain a roller compacted and cured water-resistant foam asphalt concrete.

[0069] Example 3

[0070] The roller compacted and cured water-resistant foam asphalt concrete described in the example comprises the following weight components:

[0071] Foam asphalt 1.8 parts, aggregate (new stone) 99 parts, cement 0.5 parts, lime 0.7 parts, fiber 0.5 parts, rubber powder 4.5 parts, unsaturated polyester 4.5 parts, silane coupling agent 2.5 parts, initiator (tert-butyl hydroperoxide) microcapsules 4.5 parts, and accelerator (dodecyl mercaptan) microcapsules 4.5 parts;

[0072] The preparation of the initiator microcapsules comprises the following steps:

[0073] First step, in the environment of-10℃ to-20℃, the initiator is frozen into a solid, and then crushed and sieved to obtain solid initiator particles of 0.3mm to 2.36mm,

[0074] Second step, in the environment of-10℃ to-20℃, the solid initiator particles obtained in the first step are put into the saturated rosin ethanol solution, mixed, dispersed, filtered, and air-dried to obtain rosin-coated initiator particles,

[0075] Third step, in the normal temperature environment, the rosin-coated initiator particles obtained in the third step are put into the cement and mixed, and the cement-coated initiator particles are separated out,

[0076] Fourth step, in the normal temperature environment, water is sprinkled on the cement-coated initiator particles obtained in the third step for curing, so that the cement is solidified and hardened, and the initiator microcapsules are obtained;

[0077] The preparation of the accelerator microcapsules comprises the following steps:

[0078] First step, in the environment of-10℃ to-20℃, the accelerator is frozen into a solid, and then broken and sieved to obtain solid initiator particles of 0.3mm to 2.36mm,

[0079] Second step, in the environment of-10℃ to-20℃, the solid accelerator particles obtained in the first step are put into the saturated rosin ethanol solution, mixed, dispersed, filtered, and air-dried to obtain rosin-coated accelerator particles,

[0080] Third step, in the normal temperature environment, the rosin-coated accelerator particles obtained in the third step are put into the cement and mixed, and the cement-coated accelerator particles are separated out,

[0081] Fourth step, in the normal temperature environment, water is sprinkled on the cement-coated accelerator particles obtained in the third step for curing, so that the cement is solidified and hardened, and the accelerator microcapsules are obtained.

[0082] The specific preparation method of the roller compacted and cured water-resistant foam asphalt concrete comprises the following steps:

[0083] First step, the aggregate, cement, lime, fiber, rubber powder, unsaturated polyester, and silane coupling agent are mixed uniformly;

[0084] Second step, water is added to the uniformly mixed materials in the first step and continues to be mixed uniformly;

[0085] Third step, foam asphalt is added to the materials obtained in the second step and continues to be mixed uniformly;

[0086] Fourth step, the initiator microcapsules and the accelerator microcapsules are added to the materials obtained in the third step, and a roller compacted and cured water-resistant foam asphalt mixture is stirred uniformly;

[0087] Fifth step, the roller compacted and cured water-resistant foam asphalt mixture obtained in the fourth step is subjected to paving and rolling at the construction site to obtain a roller compacted and cured water-resistant foam asphalt concrete.

[0088] Example 4

[0089] The roller compacted, cured, water resistant, foam asphalt concrete described in this example comprises the following components by weight:

[0090] foam asphalt 3.5 parts, aggregate (construction solid waste recycled aggregate) 101 parts, cement 0.7 parts, lime 0.8 parts, fiber 0.2 parts, glue powder 5 parts, unsaturated polyester 5 parts, silane coupling agent 1 part, initiator (tert-butyl hydroperoxide) microcapsule 5 parts, accelerator (dodecyl mercaptan) microcapsule 5 parts;

[0091] The preparation of the initiator microcapsule comprises the following steps:

[0092] First, freeze the initiator into a solid in an environment of -10°C to -20°C, and then crush and sieve to obtain solid initiator particles of 0.3mm to 2.36mm,

[0093] Second, place the solid initiator particles obtained in the first step in a saturated rosin ethanol solution in an environment of -10°C to -20°C, mix and disperse, filter, and air dry to obtain rosin-coated initiator particles,

[0094] Third, place the rosin-coated initiator particles obtained in the third step in cement in a normal temperature environment, mix and separate out the cement-coated initiator particles,

[0095] Fourth, in a normal temperature environment, sprinkle water on the cement-coated initiator particles obtained in the third step to allow the cement to solidify and harden, obtaining initiator microcapsules;

[0096] The preparation of the accelerator microcapsule comprises the following steps:

[0097] First, freeze the accelerator into a solid in an environment of -10°C to -20°C, and then crush and sieve to obtain solid accelerator particles of 0.3mm to 2.36mm,

[0098] Second, place the solid accelerator particles obtained in the first step in a saturated rosin ethanol solution in an environment of -10°C to -20°C, mix and disperse, filter, and air dry to obtain rosin-coated accelerator particles,

[0099] Third, place the rosin-coated accelerator particles obtained in the third step in cement in a normal temperature environment, mix and separate out the cement-coated accelerator particles,

[0100] Fourth, in a normal temperature environment, sprinkle water on the cement-coated accelerator particles obtained in the third step to allow the cement to solidify and harden, obtaining accelerator microcapsules.

[0101] The specific preparation method of the roller compacted and cured water-resistant foam asphalt concrete comprises the following steps:

[0102] Firstly, the aggregate, cement, lime, fiber, rubber powder, unsaturated polyester, and silane coupling agent are uniformly mixed;

[0103] Secondly, water is added to the uniformly mixed materials of the first step for further uniform mixing;

[0104] Thirdly, foam asphalt is added to the materials obtained in the second step for further uniform mixing;

[0105] Fourthly, initiator microcapsules and accelerator microcapsules are added to the materials obtained in the third step for uniform stirring to obtain a roller compacted and cured water-resistant foam asphalt mixture;

[0106] Fifthly, the roller compacted and cured water-resistant foam asphalt mixture obtained in the fourth step is subjected to paving and rolling at the construction site to obtain a roller compacted and cured water-resistant foam asphalt concrete.

[0107] Example 5

[0108] The roller compacted and cured water-resistant foam asphalt concrete described in this example comprises the following components by weight:

[0109] 2.2 parts of foam asphalt, 100 parts of aggregate (building solid waste recycled aggregate), 0.9 parts of cement, 0.9 parts of lime, 0.4 parts of fiber, 5.5 parts of rubber powder, 5.5 parts of unsaturated polyester, 1.5 parts of silane coupling agent, 5.5 parts of initiator (tert-butyl hydroperoxide) microcapsules, and 5.5 parts of accelerator (dodecyl mercaptan) microcapsules;

[0110] The preparation of the initiator microcapsules comprises the following steps:

[0111] Firstly, the initiator is frozen into a solid at -10°C to -20°C, and then crushed and sieved to obtain solid initiator particles of 0.3mm to 2.36mm,

[0112] Secondly, the solid initiator particles obtained in the first step are placed in a saturated rosin ethanol solution at -10°C to -20°C, and are mixed, dispersed, filtered, and air-dried to obtain rosin-coated initiator particles,

[0113] Thirdly, the rosin-coated initiator particles obtained in the third step are placed in cement at room temperature and mixed to separate out cement-coated initiator particles,

[0114] Fourthly, water is sprayed on the cement-coated initiator particles obtained in the third step at room temperature for curing and hardening of the cement to obtain initiator microcapsules;

[0115] The preparation of the accelerator microcapsule comprises the following steps:

[0116] In the first step, the accelerator is frozen into a solid at-10 to-20°C, and then broken and sieved to obtain solid initiator particles of 0.3 to 2.36 mm,

[0117] In the second step, the solid accelerator particles obtained in the first step are placed in a saturated rosin ethanol solution at-10 to-20°C, and stirred, dispersed, filtered and air-dried to obtain rosin-coated accelerator particles,

[0118] In the third step, the rosin-coated accelerator particles obtained in the third step are placed in cement at room temperature and stirred to separate out cement-coated accelerator particles,

[0119] In the fourth step, water is sprayed on the cement-coated accelerator particles obtained in the third step at room temperature to allow the cement to solidify and harden, and accelerator microcapsules are obtained.

[0120] The specific preparation method of the roller compacted and cured water-resistant foam asphalt concrete comprises the following steps:

[0121] In the first step, the aggregate, cement, lime, fiber, rubber powder, unsaturated polyester and silane coupling agent are uniformly mixed;

[0122] In the second step, water is added to the uniformly mixed materials of the first step and the mixture is further uniformly mixed;

[0123] In the third step, foam asphalt is added to the mixture obtained in the second step and the mixture is further uniformly mixed;

[0124] In the fourth step, initiator microcapsules and accelerator microcapsules are added to the mixture obtained in the third step, and a roller compacted and cured water-resistant foam asphalt mixture is obtained after stirring;

[0125] In the fifth step, the roller compacted and cured water-resistant foam asphalt mixture obtained in the fourth step is spread and compacted on site to obtain a roller compacted and cured water-resistant foam asphalt concrete.

[0126] Example 6

[0127] The roller compacted and cured water-resistant foam asphalt concrete described in this example comprises the following components by weight:

[0128] Foam asphalt 1.8 parts, aggregate (construction solid waste recycled aggregate) 99 parts, cement 1.1 parts, lime 1 part, fiber 0.5 part, rubber powder 6 parts, unsaturated polyester 6 parts, silane coupling agent 3 parts, initiator (tert-butyl hydroperoxide) microcapsule 6 parts, accelerator (dodecyl mercaptan) microcapsule 6 parts;

[0129] The preparation of the initiator microcapsule comprises the following steps:

[0130] First step, in the environment of-10℃ to-20℃, the initiator is frozen into solid, and then broken, screened to get 0.3mm to 2.36mm solid initiator particles,

[0131] Second step, in the environment of-10℃ to-20℃, the solid initiator particles obtained in the first step are placed in the saturated rosin ethanol solution, mixed, dispersed, filtered, and air-dried to get rosin-coated initiator particles,

[0132] Third step, in the normal temperature environment, the rosin-coated initiator particles obtained in the third step are placed in the cement to mix and separate the cement-coated initiator particles,

[0133] Fourth step, in the normal temperature environment, water is sprinkled on the cement-coated initiator particles obtained in the third step for curing, so that the cement is solidified and hardened to obtain initiator microcapsules;

[0134] The preparation of the accelerator microcapsules comprises the following steps:

[0135] First step, in the environment of-10℃ to-20℃, the accelerator is frozen into solid, and then broken, screened to get 0.3mm to 2.36mm solid accelerator particles,

[0136] Second step, in the environment of-10℃ to-20℃, the solid accelerator particles obtained in the first step are placed in the saturated rosin ethanol solution, mixed, dispersed, filtered, and air-dried to get rosin-coated accelerator particles,

[0137] Third step, in the normal temperature environment, the rosin-coated accelerator particles obtained in the third step are placed in the cement to mix and separate the cement-coated accelerator particles,

[0138] Fourth step, in the normal temperature environment, water is sprinkled on the cement-coated accelerator particles obtained in the third step for curing, so that the cement is solidified and hardened to obtain accelerator microcapsules.

[0139] The specific preparation method of the roller compacted and cured water-resistant foam asphalt concrete comprises the following steps:

[0140] First step, the aggregate, cement, lime, fiber, rubber powder, unsaturated polyester, and silane coupling agent are mixed uniformly;

[0141] Second step, water is added to the uniformly mixed materials in the first step and continues to be mixed uniformly;

[0142] Third step, foam asphalt is added to the materials obtained in the second step and continues to be mixed uniformly;

[0143] Fourth step, initiator microcapsules and accelerator microcapsules are added to the materials obtained in the third step, and a kind of roller compacted and cured water-resistant foam asphalt mixture is stirred uniformly.

[0144] Fifth step, the fourth step to get a rolling curing type water resistance foam asphalt mixture after paving, rolling in the construction site to get a rolling curing type water resistance foam asphalt concrete.

[0145] Example 7

[0146] The rolling curing type water resistance foam asphalt concrete described in this embodiment comprises the following weight components:

[0147] foam asphalt 3.5 parts, aggregate (asphalt mixture recycling material) 101 parts, cement 1.3 parts, lime 1.2 parts, fiber 0.1 part, glue powder 6.5 parts, unsaturated polyester 6.5 parts, silane coupling agent 1.8 parts, initiator (tert-butyl hydroperoxide) microcapsule 6.5 parts, accelerator (tert-butyl hydroperoxide) microcapsule 6.5 parts;

[0148] The preparation of the initiator microcapsule comprises the following steps:

[0149] First step, freeze the initiator into a solid in the environment of-10℃ to-20℃, and then crush and sieve to get solid initiator particles of 0.3mm to 2.36mm,

[0150] Second step, put the solid initiator particles obtained in the first step into the saturated rosin ethanol solution in the environment of-10℃ to-20℃, mix and disperse, filter and air dry to get rosin-coated initiator particles,

[0151] Third step, put the rosin-coated initiator particles obtained in the third step into cement in the normal temperature environment, mix and separate the cement-coated initiator particles,

[0152] Fourth step, sprinkle water on the cement-coated initiator particles obtained in the third step in the normal temperature environment, and let the cement solidify and harden to get initiator microcapsules;

[0153] The preparation of the accelerator microcapsule comprises the following steps:

[0154] First step, freeze the accelerator into a solid in the environment of-10℃ to-20℃, and then crush and sieve to get solid accelerator particles of 0.3mm to 2.36mm,

[0155] Second step, put the solid accelerator particles obtained in the first step into the saturated rosin ethanol solution in the environment of-10℃ to-20℃, mix and disperse, filter and air dry to get rosin-coated accelerator particles,

[0156] Third step, put the rosin-coated accelerator particles obtained in the third step into cement in the normal temperature environment, mix and separate the cement-coated accelerator particles,

[0157] Fourth step, in the normal temperature environment, on the cement coated accelerator particles obtained in the third step, sprinkle water curing, so that the cement solidification hardening, to obtain the accelerator microcapsule.

[0158] The specific preparation method of the roller compacted water-resistant foam asphalt concrete comprises the following steps:

[0159] First step, the aggregate, cement, lime, fiber, glue powder, unsaturated polyester, silane coupling agent are mixed uniformly;

[0160] Second step, add water to the uniformly mixed material of the first step and continue to mix uniformly;

[0161] Third step, add foam asphalt to the material obtained in the second step and continue to mix uniformly;

[0162] Fourth step, add initiator microcapsule and accelerator microcapsule to the material obtained in the third step, and stir uniformly to obtain a roller compacted water-resistant foam asphalt mixture;

[0163] Fifth step, the roller compacted water-resistant foam asphalt mixture obtained in the fourth step is obtained after paving and rolling at the construction site.

[0164] Example 8

[0165] The roller compacted water-resistant foam asphalt concrete described in this embodiment comprises the following weight components:

[0166] Foam asphalt 2.2 parts, aggregate (asphalt mixture recycling material) 100 parts, cement 1.6 parts, lime 1.4 parts, fiber 0.3 parts, glue powder 7.5 parts, unsaturated polyester 7.5 parts, silane coupling agent 2.6 parts, initiator (tert-butyl hydroperoxide) microcapsule 7.5 parts, accelerator (dodecyl mercaptan) microcapsule 7.5 parts;

[0167] The preparation of the initiator microcapsule comprises the following steps:

[0168] First step, freeze the initiator into a solid in the environment of-10℃ to-20℃, and then crush and sieve to obtain solid initiator particles of 0.3mm to 2.36mm,

[0169] Second step, place the solid initiator particles obtained in the first step in a saturated rosin ethanol solution in the environment of-10℃ to-20℃, mix, disperse, filter and air dry to obtain rosin coated initiator particles,

[0170] Third step, place the rosin coated initiator particles obtained in the third step in cement in a normal temperature environment, mix and separate the cement coated initiator particles,

[0171] Fourth step, in the normal temperature environment, on the cement coated initiator particles obtained in the third step sprinkle water curing, so that the cement solidification hardening, to obtain the initiator microcapsule;

[0172] The preparation of the accelerator microcapsule comprises the following steps:

[0173] First step, in the-10℃ to-20℃ environment, the accelerator is frozen into a solid, and then broken, screened to obtain 0.3mm to 2.36mm solid initiator particles,

[0174] Second step, in the-10℃ to-20℃ environment, the solid accelerator particles obtained in the first step are placed in a saturated rosin ethanol solution, mixed, dispersed, filtered, and air dried to obtain rosin coated accelerator particles,

[0175] Third step, in the normal temperature environment, the rosin coated accelerator particles obtained in the third step are placed in cement and mixed, and the cement coated accelerator particles are separated out,

[0176] Fourth step, in the normal temperature environment, on the cement coated accelerator particles obtained in the third step sprinkle water curing, so that the cement solidification hardening, to obtain the accelerator microcapsule.

[0177] The specific preparation method of the roller compacted and cured water-resistant foam asphalt concrete comprises the following steps:

[0178] First step, mix the aggregate, cement, lime, fiber, rubber powder, unsaturated polyester, and silane coupling agent uniformly;

[0179] Second step, add water to the uniformly mixed material in the first step and continue to mix uniformly;

[0180] Third step, add foam asphalt to the material obtained in the second step and continue to mix uniformly;

[0181] Fourth step, add initiator microcapsules and accelerator microcapsules to the material obtained in the third step, and stir to obtain a roller compacted and cured water-resistant foam asphalt mixture;

[0182] Fifth step, the roller compacted and cured water-resistant foam asphalt mixture obtained in the fourth step is subjected to paving and rolling at the construction site to obtain a roller compacted and cured water-resistant foam asphalt concrete.

[0183] Example 9

[0184] The roller compacted and cured water-resistant foam asphalt concrete described in this example comprises the following weight components:

[0185] Foamed asphalt 1.8 parts, aggregate (asphalt mixture recycling material) 99 parts, cement 1.8 parts, lime 1.5 parts, fiber 0.4 parts, glue powder 8.5 parts, unsaturated polyester 8.5 parts, silane coupling agent 2.8 parts, initiator (tert-butyl hydroperoxide) microcapsule 8.5 parts, accelerator (dodecyl mercaptan) microcapsule 8.5 parts;

[0186] The preparation of the initiator microcapsule comprises the following steps:

[0187] In the first step, the initiator is frozen into a solid in an environment of-10℃ to-20℃, and then broken and sieved to obtain solid initiator particles of 0.3mm to 2.36mm,

[0188] In the second step, the solid initiator particles obtained in the first step are placed in a saturated rosin ethanol solution in an environment of-10℃ to-20℃, and mixed, dispersed, filtered and air-dried to obtain rosin-coated initiator particles,

[0189] In the third step, the rosin-coated initiator particles obtained in the third step are placed in cement in a normal temperature environment, mixed and separated to obtain cement-coated initiator particles,

[0190] In the fourth step, water is sprayed on the cement-coated initiator particles obtained in the third step in a normal temperature environment, and the cement is allowed to solidify and harden to obtain initiator microcapsules;

[0191] The preparation of the accelerator microcapsule comprises the following steps:

[0192] In the first step, the accelerator is frozen into a solid in an environment of-10℃ to-20℃, and then broken and sieved to obtain solid accelerator particles of 0.3mm to 2.36mm,

[0193] In the second step, the solid accelerator particles obtained in the first step are placed in a saturated rosin ethanol solution in an environment of-10℃ to-20℃, and mixed, dispersed, filtered and air-dried to obtain rosin-coated accelerator particles,

[0194] In the third step, the rosin-coated accelerator particles obtained in the third step are placed in cement in a normal temperature environment, mixed and separated to obtain cement-coated accelerator particles,

[0195] In the fourth step, water is sprayed on the cement-coated accelerator particles obtained in the third step in a normal temperature environment, and the cement is allowed to solidify and harden to obtain accelerator microcapsules.

[0196] The preparation method of the roller compacted and cured water-resistant foamed asphalt concrete comprises the following steps:

[0197] In the first step, the aggregate, cement, lime, fiber, glue powder, unsaturated polyester, silane coupling agent are mixed uniformly;

[0198] Second step, add water to the first step of the uniform mixture and continue to mix evenly;

[0199] Third step, add foamed asphalt to the material obtained in the second step and continue to mix evenly;

[0200] Fourth step, add initiator microcapsules and accelerator microcapsules to the material obtained in the third step, and stir evenly to obtain a roller compacted and cured water-resistant foamed asphalt mixture;

[0201] Fifth step, the roller compacted and cured water-resistant foamed asphalt mixture obtained in the fourth step is subjected to paving and rolling at the construction site to obtain a roller compacted and cured water-resistant foamed asphalt concrete.

[0202] Application effect of the embodiment

[0203] According to the relevant provisions of "Highway Engineering Asphalt and Mixture Test Regulations" (JTG E20-2011), the performance of the roller compacted and cured water-resistant foamed asphalt concrete, the building solid waste recycled aggregate foamed asphalt concrete, the RAP recycled material foamed asphalt concrete, the new stone hot mix asphalt concrete, and the new stone foamed asphalt concrete of Examples 1-9 is tested and compared, and the performance is shown in the following table.

[0204] Table 1 Technical performance of various foamed asphalt concretes

[0205]

[0206] The new stone and the building solid waste recycled aggregate are designed with AC-13 gradation, and the RAP recycled material is designed with fine-graded gradation. As can be seen from the data in the table, under the same asphalt content, the porosity of the roller compacted and cured foamed asphalt concrete in Examples 1-9 is less than that of the non-roller compacted foamed asphalt concrete, and the un-frozen splitting strength, the frozen splitting strength, the frozen splitting strength ratio, the Marshall stability, and the residual stability indicators are significantly higher than those of the non-roller compacted foamed asphalt concrete. In particular, compared with the traditional RAP foamed asphalt concrete, the un-frozen splitting strength is increased by 12.2%, the frozen splitting strength is increased by 21.5%, the frozen splitting strength ratio is increased by 8.4%, the Marshall stability is increased by 44.5%, and the residual stability is increased by 5.2%, and the frozen splitting strength ratio and the residual stability meet the technical requirements of the new stone hot mix asphalt concrete. Therefore, the roller compacted and cured foamed asphalt concrete has more excellent water stability and mechanical strength.

Claims

1. A roller compacted, cured, water-resistant, foamed asphalt concrete, characterized in that, Comprising the following weight components: foamed asphalt 1.8-3.5 parts, aggregate 99-101 parts, cement 0.1-1.8 parts, lime 0.5-1.5 parts, fiber 0.1-0.5 parts, powder 2.5-8.5 parts, unsaturated polyester 2.5-8.5 parts, silane coupling agent 0.5-3 parts, initiator microcapsule 2.5-8.5 parts, accelerator microcapsule 2.5-8.5 parts; Preparation of the initiator microcapsule comprises the following steps: First, freeze the initiator into a solid at-10℃ to-20℃, then crush and sieve to obtain solid initiator particles of 0.3mm to 2.36mm; Second, place the solid initiator particles obtained in the first step in a saturated rosin ethanol solution at-10℃ to-20℃, mix and disperse, filter and air dry to obtain rosin-coated initiator particles; Third, place the rosin-coated initiator particles obtained in the second step in cement at room temperature, mix and separate the cement-coated initiator particles; Fourth, sprinkle water on the cement-coated initiator particles obtained in the third step at room temperature to allow the cement to solidify and harden, obtaining initiator microcapsules; Preparation of the accelerator microcapsule comprises the following steps: First, freeze the accelerator into a solid at-10℃ to-20℃, then crush and sieve to obtain solid accelerator particles of 0.3mm to 2.36mm; Second, place the solid accelerator particles obtained in the first step in a saturated rosin ethanol solution at-10℃ to-20℃, mix and disperse, filter and air dry to obtain rosin-coated accelerator particles; Third, place the rosin-coated accelerator particles obtained in the second step in cement at room temperature, mix and separate the cement-coated accelerator particles; Fourth, sprinkle water on the cement-coated accelerator particles obtained in the third step at room temperature to allow the cement to solidify and harden, obtaining accelerator microcapsules.

2. The roll-mixing, cured, water-resistant, foamed asphalt concrete according to claim 1, characterized in that, The solid initiator is t-butyl hydroperoxide, the solid accelerator is dodecyl mercaptan, and the aggregate is one of new stone, construction waste recycled aggregate, and asphalt mixture recycling material (RAP).

3. The roller compacted and cured water-resistant foamed asphalt concrete according to claim 2, wherein the construction waste recycled aggregate is recycled stone formed by crushing, sieving, washing, and drying of waste concrete blocks.

4. A method of producing the roller compacted, cured, water-resistant foam bituminous concrete according to claim 1, characterized in that, The method comprises the following steps: First, mix the aggregate, cement, lime, fiber, powder, unsaturated polyester, and silane coupling agent uniformly; Second, add water to the uniformly mixed material of the first step and continue to mix uniformly; Third, add foamed asphalt to the material obtained in the second step and continue to mix uniformly; Fourth, add the initiator microcapsule and the accelerator microcapsule to the material obtained in the third step, and mix uniformly to obtain a roller compacted and cured water-resistant foamed asphalt mixture; Fifth, the roller compacted and cured water-resistant foamed asphalt mixture obtained in the fourth step is subjected to paving and rolling at the construction site to obtain a roller compacted and cured water-resistant foamed asphalt concrete.

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