A mortar for airport prefabricated runway mortaring technology

Abstract

The present invention discloses a mortar for airport prefabricated runway mortaring technology, wherein the mortar comprises the following components by weight: 300-400 parts of cement, 620-820 parts of fine aggregate, 40-80 parts of fly ash, 15-60 parts of acrylic emulsion polymer, 15-60 parts of vinyl acetate-ethylene copolymer emulsion, 2-5 parts of polyethylene fiber, 4-10 parts of basalt fiber, 1.5-6 parts of graphene oxide aqueous solution, 1-4 parts of water reducer, and 150-250 parts of water. The present invention uses polymer modification, bubble control, fiber toughening and other technologies to prepare a mortar with long working time, moderate fluidity, low shrinkage, good volume stability, high compressive and flexural strength, good impact resistance and vibration reduction performance, and high bonding strength, which is suitable for airport prefabricated runway mortaring technology.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and in particular relates to mortar used in airport assembled runway mortaring technology. Background Art

[0002] The western border area of ​​my country is in a hub position, but the number of airports is scarce and the airport facilities are weak, which has formed an unfavorable situation of empty and weak forces on the border, which has had a serious impact on ensuring the national defense security of the border area. Therefore, it is urgent to strengthen the construction of airport facilities and ensure peace and stability in the western border area. The airport pavement is the core of the airport infrastructure. The existing airport runways mainly adopt the cast-in-place method. The cast-in-place concrete pavement faces problems such as long cycle, difficult quality assurance, and lack of human resources. The most effective way to solve these problems is to adopt airport prefabricated runway technology. Airport prefabricated runway technology is not only the direction of field runway technology development, but also an important emergency means for future wartime support. my country's prefabricated pavement technology has made certain progress, but airport prefabricated runway technology is still in its infancy.

[0003] The design requirements for airport prefabricated runways are much higher than those for ordinary prefabricated pavements. Airport runways need to withstand the dynamic loads, heavy pressure and friction of aircraft landing and taking off for a long time, and have higher requirements for flatness, impact resistance, and pressure resistance. Ordinary prefabricated runway technology mostly adopts the bottom grouting method, which has a complex process and is difficult to control. The grouting technology can effectively solve the above problems and is more suitable for airport prefabricated runways. The performance of the grouting material directly affects the degree of adhesion between the prefabricated pavement panel, the grouting layer and the base layer, and further affects the dynamic and static mechanical response and degradation process of the entire pavement structure. The existing grouting material has an unstable volume, which increases the difficulty of leveling the surface, resulting in a flatness that is difficult to meet the construction requirements of the prefabricated runway. In addition, the existing grouting material has insufficient adhesion. Under the impact of aircraft impact loads and complex and harsh environments, the entire pavement structure has poor durability and a short service life. Therefore, it is a difficult problem that needs to be solved urgently to select suitable mortar and performance improvement technology according to the structural characteristics of the airport prefabricated runway, and to prepare mortar with long working time, moderate fluidity, low shrinkage, good volume stability, high compressive and flexural strength, good impact resistance and vibration reduction performance, and high bonding strength. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a mortar for airport prefabricated runway mortaring technology. The mortar provided by the present invention not only has the advantages of long working time and good volume stability, but also has the characteristics of good static and dynamic mechanical properties and high bonding strength. It can meet the use of airport prefabricated runway mortaring technology, and can also be used for other building structures with high dynamic performance requirements and high bonding requirements.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] The present invention discloses a mortar for airport prefabricated runway mortaring technology, wherein the mortar comprises the following components in parts by weight:

[0007] 300-400 parts of cement, 620-820 parts of fine aggregate, 40-80 parts of fly ash, 15-60 parts of acrylic emulsion polymer, 15-60 parts of vinyl acetate-ethylene copolymer emulsion, 2-5 parts of polyethylene fiber, 4-10 parts of basalt fiber, 1.5-6 parts of graphene oxide aqueous solution, 1-4 parts of water reducer, and 150-250 parts of water.

[0008] The mortar for airport prefabricated runway mortaring technology provided by the present invention is blended with acrylic emulsion polymer and vinyl acetate-ethylene copolymer emulsion, which can form a network structure in the cement matrix, disperse and conduct stress, inhibit the generation and spread of cracks, and improve the durability, toughness, flexural strength, bonding strength and impact resistance of the mortar. In addition, during the glass transition of the amorphous polymer, most of the vibration energy can be dissipated by relaxing the polymer chain segments, thereby improving the vibration damping performance of the mortar. In order to avoid the air entrainment effect associated with the blending modification of the acrylic emulsion polymer and the vinyl acetate-ethylene copolymer emulsion, which will reduce the compressive strength of the mortar, the present invention uses an aqueous solution of graphene oxide as a defoaming agent. The inventors found that the aqueous solution of graphene oxide can effectively prevent the air entrainment effect, reduce the pore volume, and thus greatly improve the mechanical properties of the mortar. In addition, due to the large specific surface area and nano-micro size effect of graphene oxide, cement particles are prompted to form a flocculated structure, which also increases the bonding strength of the mortar. In addition, basalt fibers and polyethylene fibers are also added to the mortar of the present invention. The mixing of basalt fibers and polyethylene fibers can transmit stress, inhibit the spread of cracks, and improve the durability, toughness, flexural strength, and compressive and impact resistance of the mortar. In addition, when a dynamic load is applied, the energy generated can be dissipated in the form of microplastic strain of debonding or broken fibers of basalt fibers and polyethylene fibers, and the stress concentration generated by the vibration frequency inside the matrix can also be released, which means that the mixing of basalt fibers and polyethylene fibers can improve the vibration reduction performance of the mortar. Under the synergistic effect of the formula and ingredients of the present invention, the mortar provided not only has the advantages of long working time and good volume stability, but also has the characteristics of good static and dynamic mechanical properties and high bonding strength, which can well meet the requirements of airport prefabricated runway mortaring technology.

[0009] In a preferred embodiment, the mortar is composed of the following components by weight: 300-350 parts of cement, 620-720 parts of fine aggregate, 40-60 parts of fly ash, 15-60 parts of acrylic emulsion polymer, 15-60 parts of vinyl acetate-ethylene copolymer emulsion, 2-5 parts of polyethylene fiber, 4-9 parts of basalt fiber, 1.5-3 parts of graphene oxide aqueous solution, 1-3 parts of water reducer, and 150-200 parts of water.

[0010] Further preferably, the mortar is composed of the following components by weight: 300-320 parts of cement, 620-720 parts of fine aggregate, 40-50 parts of fly ash, 15-50 parts of acrylic emulsion polymer, 15-50 parts of vinyl acetate-ethylene copolymer emulsion, 2-4 parts of polyethylene fiber, 4-7 parts of basalt fiber, 1.5-2 parts of graphene oxide aqueous solution, 1-2 parts of water reducer, and 150-200 parts of water.

[0011] In a preferred embodiment, the mass ratio of the acrylic emulsion polymer to the vinyl acetate-ethylene copolymer emulsion is 1:0.5-2, preferably 1:1.

[0012] The inventors have found that when the mass ratio of the acrylic emulsion polymer to the vinyl acetate-ethylene copolymer emulsion is controlled within the above range, the modification effect on the mortar is ultimately optimal.

[0013] In a preferred embodiment, the mass ratio of the polyethylene fiber to the basalt fiber is 1:1-2, preferably 1:2.

[0014] The inventors have found that when the mass ratio of the acrylic emulsion polymer to the vinyl acetate-ethylene copolymer emulsion is controlled within the above range, the modification effect on the mortar is ultimately optimal.

[0015] In the present invention, the cement is 42.5R type ordinary Portland cement (OPC) conforming to GB / T 175 standard.

[0016] In a preferred embodiment, the fine aggregate is natural river sand, the particle size of the fine aggregate is ≤4.75 mm, and the fineness modulus is 3.0. The performance of the fine aggregate used in the present invention meets the requirements of the Chinese standard (GB / T 14684).

[0017] In the present invention, the fly ash used is F-type fly ash, the SiO2 content in the fly ash is 49.53%, and the Al2O3 content in the fly ash is 27.84%.

[0018] In a preferred embodiment, the acrylic emulsion polymer has a pH value of 6.5 to 8.5, a viscosity of less than 100, a glass transition temperature of less than 0° C., and a solid content of 46% to 48%.

[0019] In a preferred embodiment, the vinyl acetate-ethylene copolymer emulsion has a pH value of 6.5 to 8.5, a viscosity of 50 to 500, a glass transition temperature of -17°C, and a minimum film-forming temperature of <0°C.

[0020] In a preferred embodiment, the polyethylene fiber has a length of 9 to 18 mm and a diameter of 20 to 60 μm.

[0021] The inventors found that when the length of the polyethylene fiber is controlled within the above range, the performance of the final mortar is optimal, while if the fiber is too short, it is difficult to bridge the cracks, and if the fiber is too long, it is not convenient to sample the following test samples.

[0022] Preferably, the polyethylene fibers have a single and clustered microstructure.

[0023] The polyethylene fiber used in the present invention has a single and clustered microstructure in the scanning electron microscope image.

[0024] In a preferred embodiment, the basalt fiber has a density of 2.65 to 3.05 g / cm 3 , softening point 960℃.

[0025] In a preferred embodiment, in the graphene oxide aqueous solution, the solid-liquid mass volume ratio of graphene oxide to water is 2 to 6 mg:1 mL.

[0026] In a preferred solution, the water reducer is a polycarboxylic acid high-efficiency water reducer, the water reduction rate of the water reducer is ≥20%, and the solid content is 40-55%.

[0027] The polycarboxylate high-efficiency water reducer used in the present invention is RMC-3, with a density of 1.102 g / cm 3 .

[0028] A preferred solution is that the preparation method of the mortar for the airport prefabricated runway mortaring technology is as follows: divide water into two parts, disperse acrylic emulsion polymer and vinyl acetate-ethylene copolymer emulsion in the first part of water to obtain a polymer dispersion, then mix the polymer dispersion with a graphene oxide aqueous solution, ultrasonically treat for 8 to 12 minutes to obtain a graphene oxide-polymer composite solution, add cement, fine aggregate, and fly ash and stir for 1 to 3 minutes, then add the graphene oxide-polymer composite solution and a water reducer and stir for 3 to 5 minutes; finally, add polyethylene fiber and basalt fiber, add the second part of water, and continue stirring for 2 to 4 minutes.

[0029] Through the above method, the raw materials can be fully dispersed and stirred evenly.

[0030] The advantages of the present invention are as follows:

[0031] (1) The blending modification of acrylic emulsion polymer and vinyl acetate-ethylene copolymer emulsion improves the volume stability, durability, toughness, flexural strength, vibration reduction performance, impact resistance, bonding strength, etc. of the mortar. The blending of acrylic emulsion polymer and vinyl acetate-ethylene copolymer emulsion can optimize the pore structure, reduce shrinkage, and increase the volume stability of the mortar. Acrylic emulsion polymer and vinyl acetate-ethylene copolymer emulsion form a network structure in the cement matrix, which can disperse and conduct stress, inhibit the generation and diffusion of cracks, and improve the durability, toughness, flexural strength, bonding strength, and impact resistance of the mortar. In addition, during the glass transition of the amorphous polymer, most of the vibration energy can be dissipated by relaxing the polymer chain segments, thereby improving the vibration reduction performance of the mortar.

[0032] (2) The air entrainment effect associated with polymer modification will reduce the compressive strength of the mortar. The present invention uses a two-dimensional nanomaterial graphene oxide aqueous solution to regulate the bubbles, further increase the mechanical properties of the mortar, and at the same time improve the bonding strength of the mortar. The two-dimensional nanomaterial graphene oxide aqueous solution can regulate the interaction between the polymer and the cement matrix, act as a defoamer in the graphene oxide polymer modified composite material, prevent its air entrainment effect, reduce the pore volume, and thus greatly improve the mechanical properties of the mortar. In addition, because graphene oxide has a large specific surface area and nano-micro size effect, it promotes the cement particles to form a flocculated structure, which increases the bonding strength of the mortar.

[0033] (3) The blending of basalt fiber and polyethylene fiber further improves the durability, toughness, flexural and compressive strength, vibration reduction performance, impact resistance, etc. of the mortar, while appropriately reducing the flow properties of the mortar. The blending of basalt fiber and polyethylene fiber can transmit stress, inhibit the spread of cracks, and improve the durability, toughness, flexural strength, and compressive and impact resistance of the mortar. In addition, when dynamic loads are applied, the energy generated can be dissipated in the form of microplastic strain of debonding or broken fibers of basalt and polyethylene fibers, and the stress concentration generated by the vibration frequency inside the matrix can also be released, which means that the blending of basalt fiber and polyethylene fiber can improve the vibration reduction performance of the mortar. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of mortar used in airport prefabricated runway mortaring technology.

[0035] Figure 2 It is the structural diagram of the airport prefabricated runway pavement system. DETAILED DESCRIPTION

[0036] The present invention is described in detail with reference to examples and drawings, as follows.

[0037] A mortar for airport prefabricated runway mortaring technology, such as Figure 1As shown, it is composed of cement, fine aggregate, fly ash, acrylic emulsion polymer, vinyl acetate-ethylene copolymer emulsion, polyethylene fiber, basalt fiber, two-dimensional nanomaterial graphene oxide aqueous solution, water reducer and water. The components by weight are: 300-400 parts of cement, 620-820 parts of fine aggregate, 40-80 parts of fly ash, 15-60 parts of acrylic emulsion polymer, 15-60 parts of vinyl acetate-ethylene copolymer emulsion, 2-5 parts of polyethylene fiber, 4-10 parts of basalt fiber, 1.5-6 parts of two-dimensional nanomaterial graphene oxide aqueous solution, 1-4 parts of water reducer, and 150-250 parts of water.

[0038] The cement is 42.5R type ordinary Portland cement (OPC) conforming to GB / T 175 standard.

[0039] The fine aggregate is natural river sand, the performance of which meets the requirements of Chinese standards (GB / T 14684), and is from Xiamen ISO Standard Sand Co., Ltd. (Xiamen, China). The maximum particle size of the aggregate is 4.75 mm and the fineness modulus is 3.0.

[0040] The fly ash is F-type fly ash, with a density of 1.8-2.3 g / cm3, a SiO2 content of 49.53%, and an Al2O3 content of 27.84%. SiO2 and Al2O3 react with Ca(OH)2 to generate hydrated calcium silicate, hydrated calcium aluminate, etc., which strengthen the concrete and block the capillary structure in the concrete, thereby improving the compactness and durability of the concrete.

[0041] The acrylic emulsion polymer has a pH value of 6.5 to 8.5, a viscosity of less than 100, a glass transition temperature of less than 0°C, and a solid content of 47% ± 1%, and is from Changsha Libo Chemical Co., Ltd. Acrylic emulsion polymer can improve the strength, durability, flexibility, abrasion resistance and adhesion of cement-based materials, and is suitable for places that require thin layers and are subject to excessive vibration and heavy traffic.

[0042] The density of the vinyl acetate-ethylene copolymer emulsion is 0.92-0.98 g / cm 3 , melting point 99℃, from Changsha Libo Chemical Co., Ltd. Cement mortar modified by vinyl acetate-ethylene copolymer emulsion has the advantages of high initial adhesion, excellent construction performance, low water absorption, high bonding strength, good flexibility and crack resistance, good adhesion to the substrate, and low cost.

[0043] The polyethylene fiber has a length of 12 mm, a diameter of 40 μm, a Poisson's ratio of 0.38, and a tensile elastic modulus of 0.84-0.95 GPa. It comes from Guangdong Tewilong New Materials Application Co., Ltd., and its scanning electron microscope image has a single and clustered microstructure morphology.

[0044] The basalt fiber density is 2.65-3.05 g / cm 3 , softening point 960℃, elastic modulus 75GPa, tensile strength 1200MPa, elongation at break 3.5%, from Zhengzhou China Communications Construction Materials Co., Ltd.

[0045] The two-dimensional nanomaterial graphene oxide aqueous solution has a concentration of 4 mg / ml and is prepared from graphite oxide as raw material. It comes from Jiangsu Changzhou Sixth Element Co., Ltd. The two-dimensional nanomaterial graphene oxide aqueous solution can adjust the interaction between the polymer and the cement matrix, prevent its air entrainment effect, reduce the pore volume, and thus greatly improve the mechanical properties of the mortar. At the same time, due to the large specific surface area and nano-micro size effect of graphene oxide, cement particles are prompted to form a flocculated structure, which increases the bonding strength of the mortar.

[0046] The water reducer is a polycarboxylic acid high-efficiency water reducer of model RMC-3, with a water reduction rate of ≥20%, a solid content of about 49%, a density of 1.102g / cm3, and a pH of 8.09, from Zhengzhou Zhongjiao Building Materials Co., Ltd. Appropriate water reducers can reduce the shrinkage of cement mortar, improve the construction and workability of cement mortar, and give cement mortar good strength development and excellent durability.

[0047] The preparation method of the mortar for the airport prefabricated runway mortaring technology comprises:

[0048] Step 1: Disperse acrylic emulsion polymer and vinyl acetate-ethylene copolymer emulsion in a portion of water in a ratio of 1:1.

[0049] Step 2: Mix the polymer aqueous solution and the graphene oxide suspension, and ultrasonically treat for 10 minutes to obtain a graphene oxide-polymer composite solution.

[0050] Step 3: Stir cement, fine aggregate and fly ash for 2 minutes, then add graphene oxide-polymer composite solution and water reducer and stir for 4 minutes.

[0051] Step 4: Slowly introduce polyethylene fiber and basalt fiber in a ratio of 1:1.5, add the remaining water, and stir at low speed for 3 minutes.

[0052] After completing the above steps, prepare the mortar, such as Figure 1 As shown, polyethylene fibers and basalt fibers are evenly distributed without orientation, fine aggregates are evenly distributed, and graphene oxide interacts with polymers to form graphene-polymer composites. The mortar can be used in airport prefabricated runway mortaring technology, such as Figure 2 As shown in the figure, in the airport prefabricated runway pavement system, as the bonding layer between the pavement and the base layer, it can improve the entire pavement system and enhance the compression resistance, flexural resistance, impact resistance, friction resistance, vibration reduction and other capabilities of the entire pavement system.

[0053] Example 1

[0054] The mortar for airport prefabricated runway mortaring technology described in Example 1 is composed of cement, fine aggregate, fly ash, acrylic emulsion polymer, vinyl acetate-ethylene copolymer emulsion, polyethylene fiber, basalt fiber, two-dimensional nanomaterial graphene oxide aqueous solution, water reducing agent and water, and its components by weight are:

[0055] 300 parts of cement, 720 parts of fine aggregate, 40 parts of fly ash, 15 parts of acrylic emulsion polymer, 15 parts of vinyl acetate-ethylene copolymer emulsion, 2 parts of polyethylene fiber, 4 parts of basalt fiber, 1.5 parts of two-dimensional nanomaterial graphene oxide aqueous solution, 1 part of water reducer, and 150 parts of water.

[0056] Example 2

[0057] The mortar for airport prefabricated runway mortaring technology described in Example 2 is composed of cement, fine aggregate, fly ash, acrylic emulsion polymer, vinyl acetate-ethylene copolymer emulsion, polyethylene fiber, basalt fiber, two-dimensional nanomaterial graphene oxide aqueous solution, water reducing agent and water, and its components by weight are:

[0058] 320 parts of cement, 620 parts of fine aggregate, 50 parts of fly ash, 30 parts of acrylic emulsion polymer, 30 parts of vinyl acetate-ethylene copolymer emulsion, 3 parts of polyethylene fiber, 5 parts of basalt fiber, 1.5 parts of two-dimensional nanomaterial graphene oxide aqueous solution, 2 parts of water reducer, and 170 parts of water.

[0059] Example 3

[0060] The mortar for airport prefabricated runway mortaring technology described in Example 3 is composed of cement, fine aggregate, fly ash, acrylic emulsion polymer, vinyl acetate-ethylene copolymer emulsion, polyethylene fiber, basalt fiber, two-dimensional nanomaterial graphene oxide aqueous solution, water reducing agent and water, and its components by weight are:

[0061] 350 parts of cement, 620 parts of fine aggregate, 60 parts of fly ash, 60 parts of acrylic emulsion polymer, 60 parts of vinyl acetate-ethylene copolymer emulsion, 4 parts of polyethylene fiber, 7 parts of basalt fiber, 1.5 parts of two-dimensional nanomaterial graphene oxide aqueous solution, 2 parts of water reducer, and 200 parts of water.

[0062] Comparative Example 1

[0063] Other conditions were the same as those in Example 1, except that no acrylic emulsion polymer and vinyl acetate-ethylene copolymer emulsion were added.

[0064] Comparative Example 2

[0065] Other conditions are the same as those in Example 1, except that no two-dimensional nanomaterial graphene oxide aqueous solution is added.

[0066] Comparative Example 3

[0067] The other conditions were the same as those in Example 1, except that basalt fiber and polyethylene fiber were not added.

[0068] Comparative Example 4

[0069] Other conditions were the same as those in Example 1, except that no acrylic emulsion polymer was added.

[0070] Comparative Example 5

[0071] The other conditions are the same as those in Example 1, except that no basalt fiber is added.

[0072] Performance Testing

[0073] (1) Liquidity test

[0074] The fluidity and consistency of concrete play a vital role in ensuring the immediate quality of concrete. The fluidity of mortar was tested using a small collapse cone with a top inner diameter of 36mm, a bottom inner diameter of 60mm and a height of 60mm. The test method was carried out in accordance with GB / T2419-2005 (2005).

[0075] (2) Shrinkage test

[0076] The shrinkage test is carried out in accordance with the technical standard JGJ / T 70-2009 to measure drying shrinkage. The testing instruments mainly include a vertical mortar shrinkage meter, a shrinkage head and a 40mm×40mm×160mm test mold.

[0077] (3) Bond strength test

[0078] The tensile bond strength test is carried out in accordance with the technical standard JGJ / T 70-2009. The testing instruments mainly include tensile testing machine, special tensile fixture, forming frame, steel pad, etc.

[0079] (4) Static mechanical properties test

[0080] Static mechanical properties tests mainly include flexural strength test and compressive strength test. The static bending properties of mortar were evaluated according to GB / T17671-1999. The MTS tester was used for loading at a displacement rate of 2 mm / min. In addition, according to the provisions of GB / T17671-1999 (1999), the compressive strength of the mortar was tested at a pressure of 2.4 kN / s.

[0081] (5) Dynamic mechanical properties test

[0082] The dynamic mechanical properties test mainly includes dynamic compressive strength and dissipation capacity. In order to obtain the dynamic impact performance of the mortar, a series of Hopkinson pressure bar tests were carried out. The Hopkinson pressure bar used has a diameter of 100mm, a 1.5-meter impact bar, a 6.0-meter input bar and a 4.0-meter output bar. In addition, the dynamic thermomechanical analyzer Eplexor500N was selected to characterize the energy dissipation capacity of the mortar for 28 days. The specimen length is 20mm, the width is 20mm, and the height is 20mm. The test adopts compression mode, static force -100N, and maximum dynamic force 80N.

[0083] Results Analysis

[0084]

[0085] It can be seen from Examples 1-3 that the mortar for airport prefabricated runway mortaring technology described in the present invention has moderate fluidity, low shrinkage, good volume stability, high compressive and flexural strength, good impact resistance and vibration reduction performance, and high bonding strength, and is suitable for airport prefabricated runway mortaring technology.

[0086] It can be seen from Example 1, Comparative Example 1 and Comparative Example 4 that, compared with the single polymer without admixture, the 1:1 blending of acrylic emulsion polymer and vinyl acetate-ethylene copolymer emulsion can improve the volume stability, durability, toughness, flexural strength, vibration reduction performance, impact resistance, bonding strength, etc. of the mortar to a greater extent. Because the 1:1 blending of acrylic emulsion polymer and vinyl acetate-ethylene copolymer emulsion can optimize the pore structure and form a tighter network structure in the cement matrix. It can be seen from Example 1 and Comparative Example 2 that the two-dimensional nanomaterial graphene oxide aqueous solution can further increase the mechanical properties of the mortar and improve the bonding strength of the mortar. Because graphene oxide has a large specific surface area and nano-micro size effect, and the two-dimensional nanomaterial graphene oxide aqueous solution can adjust the interaction between the polymer and the cement matrix, it acts as a defoamer in the graphene oxide polymer modified composite material to prevent its air entrainment effect. It can be seen from Example 1, Comparative Example 3 and Comparative Example 5 that, compared with single fiber without admixture, the blending of basalt fiber and polyethylene fiber further improves the durability, toughness, bending and compressive strength, vibration reduction performance, impact resistance, vibration reduction performance, etc. of the mortar, while appropriately reducing the flow performance of the mortar. Because the blending of basalt fiber and polyethylene fiber can conduct stress and inhibit the spread of cracks. In addition, when dynamic loads are applied, the energy generated can be dissipated in the form of microplastic strain of debonding or broken fibers of basalt fiber and polyethylene fiber, and the stress concentration generated by the vibration frequency inside the matrix can also be released.

[0087] The present invention uses polymer modification, bubble control, fiber toughening and other technologies to prepare a mortar with long working time, moderate fluidity, low shrinkage, good volume stability, high compressive and flexural strength, good impact resistance and vibration reduction performance, and high bonding strength. The mortar is suitable for airport prefabricated runway mortaring technology or other building structures with high dynamic performance requirements and high bonding requirements. The present invention can be used in the above examples, but is not limited to the above examples, and the weight of each material can be changed.

Claims

1. A mortar for airport prefabricated runway mortaring technology, characterized by: The mortar comprises the following components by weight: 300-400 parts of cement, 620-820 parts of fine aggregate, 40-80 parts of fly ash, 15-60 parts of acrylic emulsion polymer, 15-60 parts of vinyl acetate-ethylene copolymer emulsion, 2-5 parts of polyethylene fiber, 4-10 parts of basalt fiber, 1.5-6 parts of graphene oxide aqueous solution, 1-4 parts of water reducer, and 150-250 parts of water; The mass ratio of the acrylic emulsion polymer to the vinyl acetate-ethylene copolymer emulsion is 1:0.5-2.

2. The mortar for airport prefabricated runway mortaring technology according to claim 1 is characterized by: The mortar, by weight, consists of the following components: Composition: 300-350 parts of cement, 620-720 parts of fine aggregate, 40-60 parts of fly ash, 15-60 parts of acrylic emulsion polymer, 15-60 parts of vinyl acetate-ethylene copolymer emulsion, 2-5 parts of polyethylene fiber, 4-9 parts of basalt fiber, 1.5-3 parts of graphene oxide aqueous solution, 1-3 parts of water reducer, and 150-200 parts of water.

3. The mortar for airport prefabricated runway mortaring technology according to claim 2 is characterized by: The mortar is composed of the following components by weight: 320-350 parts of cement, 620-720 parts of fine aggregate, 40-50 parts of fly ash, 15-50 parts of acrylic emulsion polymer, 15-50 parts of vinyl acetate-ethylene copolymer emulsion, 2-4 parts of polyethylene fiber, 4-7 parts of basalt fiber, 1.5-2 parts of graphene oxide aqueous solution, 1-2 parts of water reducer, and 150-200 parts of water.

4. A mortar for airport prefabricated runway mortaring technology according to any one of claims 1 to 3, characterized in that: The mass ratio of the polyethylene fiber to the basalt fiber is 1:1-2.

5. The mortar for airport prefabricated runway mortaring technology according to any one of claims 1 to 3, characterized in that: The fine aggregate is natural river sand, the particle size of the fine aggregate is ≤4.75 mm, and the fineness modulus is 3.

0.

6. A mortar for airport prefabricated runway mortaring technology according to any one of claims 1 to 3, characterized in that: The acrylic emulsion polymer has a pH value of 6.5 to 8.5, a viscosity of less than 100, a glass transition temperature of less than 0°C, and a solid content of 46% to 48%; The pH value of the vinyl acetate-ethylene copolymer emulsion is 6.5-8.5, the viscosity is 50-500, the glass transition temperature is -17°C, and the minimum film-forming temperature is less than 0°C.

7. The mortar for airport prefabricated runway mortaring technology according to any one of claims 1 to 3, characterized in that: The polyethylene fiber has a length of 9 to 18 mm and a diameter of 20 to 60 μm.

8. The mortar for airport prefabricated runway mortaring technology according to any one of claims 1 to 3, characterized in that: In the graphene oxide aqueous solution, the solid-liquid mass volume ratio of graphene oxide to water is 2-6 mg:1 ml; The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the water reducing rate of the water reducing agent is ≥20%, and the solid content is 40-55%.

9. The mortar for airport prefabricated runway mortaring technology according to any one of claims 1 to 3, characterized in that: The preparation method of the mortar for the airport prefabricated runway mortaring technology is as follows: water is divided into two parts, acrylic emulsion polymer and vinyl acetate-ethylene copolymer emulsion are dispersed in the first part of water to obtain a polymer dispersion, and then the polymer dispersion is mixed with a graphene oxide aqueous solution, ultrasonically treated for 8 to 12 minutes to obtain a graphene oxide-polymer composite solution, cement, fine aggregate, and fly ash are added and stirred for 1 to 3 minutes, and then the graphene oxide-polymer composite solution and a water reducer are added and stirred for 3 to 5 minutes; finally, polyethylene fiber and basalt fiber are added, and the second part of water is added, and stirring is continued for 2 to 4 minutes.

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