A kind of papermaking white mud calcined clay-based lightweight grouting material and preparation method thereof

Abstract

The present invention relates to a papermaking white mud calcined clay-based lightweight grouting material and a preparation method thereof, and belongs to the technical field of grouting materials. In order to solve the problem that the papermaking white mud is used as a raw material to prepare a lightweight grouting material with poor mechanical properties and durability, the present invention provides a papermaking white mud calcined clay-based lightweight grouting material, the components of which include cement clinker, papermaking white mud, calcined clay, glass microspheres, gypsum, polycarboxylic acid water reducer and water. The present invention uses papermaking white mud and calcined clay as the base materials of the lightweight grouting material, obtains a lightweight grouting material with excellent mechanical properties and durability through scientific proportioning and process optimization, further improves the fluidity of the lightweight grouting material, and enables it to meet the use requirements of building materials. On the basis of not affecting the performance of the grouting material, the present invention increases the addition amount of papermaking white mud and calcined clay to about 50%, which can not only reduce costs, but also realize the resource utilization of papermaking white mud, and has significant economic and environmental benefits.

Description

Technical Field

[0001] The invention belongs to the technical field of grouting materials, and in particular relates to a papermaking white mud calcined clay-based lightweight grouting material and a preparation method thereof. Background Art

[0002] Grouting material is a special type of concrete used in engineering projects. It is often used to reinforce concrete structures and treat cracks in concrete structures. In emergency repair projects such as wall structure thickening, water seepage repair, and foundation engineering collapse, grouting materials can quickly respond and solve problems. Traditional grouting materials mainly use materials such as cement and gypsum, which have problems such as heavy weight, high cost, and heavy environmental burden.

[0003] Papermaking mud is one of the most important solid wastes in the papermaking industry. Its main components are fiber, calcium carbonate, clay and some organic matter. Long-term stacking not only occupies a large amount of land, but also pollutes the environment. At present, the main resource utilization methods of papermaking mud are agricultural utilization, energy utilization and construction material utilization.

[0004] The invention patent with publication number CN115140983A, "A Sleeve Grouting Material Mixed with Industrial Waste Slag and Its Preparation Method", uses dry white mud slag to replace light calcium carbonate, reducing the cost of the grouting material. However, the weight of the white mud slag in its components is only about 5%, which has limited effect on reducing the overall cost of the grouting material. Moreover, more than 40% of the weight of mixed sand is added as aggregate, which undoubtedly increases the weight of the grouting material.

[0005] The weight of traditional grouting materials often cannot meet the construction conditions where space is limited or the load on the original structure needs to be reduced. High-rise buildings, bridges and other construction projects that need to reduce the deadweight of the structure are more suitable for lightweight grouting materials. Using papermaking white mud as a raw material to prepare grouting materials can reduce its weight, but its mechanical properties and durability still need to be further improved. Summary of the invention

[0006] In order to solve the problem that papermaking white mud is used as a raw material to prepare a lightweight grouting material with poor mechanical properties and durability, the present invention provides a papermaking white mud calcined clay-based lightweight grouting material and a preparation method thereof.

[0007] The technical solution of the present invention:

[0008] A papermaking white mud calcined clay-based lightweight grouting material comprises the following components in parts by weight: 480-600 parts of cement clinker, 150-360 parts of papermaking white mud, 300-540 parts of calcined clay, 300 parts of glass microspheres, 48 ​​parts of gypsum, 12 parts of polycarboxylic acid water reducer and 540 parts of water.

[0009] Furthermore, the main components of the cement clinker are 60-65wt% CaO, 20-25wt% SiO2, 6.2-6.6wt% Al2O3 and 4.2-4.6wt% Fe2O3.

[0010] Furthermore, the main component of the papermaking white mud is 92-96wt% CaO.

[0011] Furthermore, the calcined clay is a calcined clay, and main components of the calcined clay are 42-47wt% Al2O3, 43-48wt% SiO2 and 3.2-3.6wt% Fe2O3.

[0012] Furthermore, the main components of the gypsum are 61-62wt% SO3 and 38-39wt% CaO.

[0013] Furthermore, the model of the glass microspheres is QK-300, and the particle size of the glass microspheres is 100 to 1000 μm.

[0014] Furthermore, the polycarboxylic acid water-reducing agent is SBT-CCP ​​(Ⅰ) polycarboxylic acid high-performance water-reducing agent for prefabricated components.

[0015] A method for preparing a papermaking white mud calcined clay-based lightweight grouting material comprises the following steps:

[0016] Step 1, cement clinker, papermaking white mud, calcined clay and gypsum are dried and ground respectively, sieved and the sieved materials are collected;

[0017] Step 2: Evenly mix the sieved cement clinker, papermaking white mud, calcined clay, gypsum and glass beads obtained in step 1, then add the mixed water and polycarboxylate water-reducing agent mixture, and mix evenly to obtain a lightweight grouting material.

[0018] Furthermore, the specific conditions for drying in step 1 are drying at 105° C. for 24 hours.

[0019] Furthermore, the sieving in step 1 is performed through a 200-mesh sieve.

[0020] Beneficial effects of the present invention:

[0021] The present invention uses papermaking white mud and calcined clay as the base material of the lightweight grouting material, and obtains the lightweight grouting material with excellent mechanical properties and durability through scientific proportioning and process optimization. The dry density of the lightweight grouting material of the present invention is only 1100-1300kg / m 3The maximum compressive strength after 28 days can reach 53.7MPa, and the electric flux can be as low as 684C. The present invention adds glass microspheres to the lightweight grouting material to increase fluidity, optimize particle grading and improve porosity, further improving the fluidity of the lightweight grouting material so that it can meet the use requirements of building materials.

[0022] The invention increases the addition amount of papermaking white mud and calcined clay to about 50% without affecting the performance of the grouting material, reduces the amount of cement used, can not only reduce costs, but also realize the resource utilization of papermaking white mud, and has significant economic and environmental benefits. The lightweight grouting material provided by the invention can not only be used as a building material, but also can be used in soil improvement, energy recovery and other fields to achieve multiple uses, further improving its application value. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below in conjunction with the embodiments, but it is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention shall be included in the protection scope of the present invention. The process equipment or devices not specifically noted in the following embodiments are all conventional equipment or devices in the art. If not specifically specified, the raw materials used in the embodiments of the present invention can be obtained commercially; if not specifically specified, the technical means used in the embodiments of the present invention are all conventional means well known to those skilled in the art.

[0024] Example 1

[0025] The present embodiment provides a papermaking white mud calcined clay-based lightweight grouting material and a preparation method thereof.

[0026] The papermaking white mud calcined clay-based lightweight grouting material of this embodiment is composed of the following components by mass: 480 parts of cement clinker, 360 parts of papermaking white mud, 360 parts of calcined clay, 300 parts of glass microspheres, 48 ​​parts of gypsum, 12 parts of polycarboxylic acid water reducer and 540 parts of water.

[0027] The main components of the cement clinker in this embodiment are 62.23wt% CaO, 22.90wt% SiO2, 6.48wt% Al2O3 and 4.41wt% Fe2O3.

[0028] The main component of the papermaking white mud in this embodiment is 94.20wt% of CaO.

[0029] The calcined clay in this embodiment is a high-temperature clay calcined at 750° C., and the main components of the calcined clay are 44.99wt% Al2O3, 45.50wt% SiO2 and 3.44wt% Fe2O3.

[0030] The main components of the gypsum in this embodiment are 61.38 wt % SO3 and 38.30 wt % CaO.

[0031] The model of the glass microspheres in this embodiment is QK-300, and the particle size of the glass microspheres is 100 to 1000 μm.

[0032] The polycarboxylic acid water-reducing agent in this embodiment is SBT-CCP ​​(Ⅰ) polycarboxylic acid high-performance water-reducing agent for prefabricated components.

[0033] The present embodiment provides a method for preparing a papermaking white mud calcined clay-based lightweight grouting material, comprising the following steps:

[0034] Step 1: Cement clinker, papermaking white mud, calcined clay and gypsum are dried at 105°C for 24 hours, then ground and passed through a 200-mesh sieve, and the sieve residue is collected;

[0035] Step 2: Evenly mix the sieved cement clinker, papermaking white mud, calcined clay, gypsum and glass beads obtained in step 1, then add the mixed water and polycarboxylate water-reducing agent mixture, and mix evenly to obtain a lightweight grouting material.

[0036] The lightweight grouting material obtained in this embodiment is poured into a mold, placed on a vibration table for vibration, smoothed, and coated on the surface. It is then cured indoors at a curing temperature of 20±5°C and a relative humidity of 90%. The curing times are 3 days, 7 days, and 28 days, respectively. The lightweight grouting material test blocks are then demolded to obtain.

[0037] Example 2

[0038] The present embodiment provides a papermaking white mud calcined clay-based lightweight grouting material and a preparation method thereof.

[0039] The papermaking white mud calcined clay-based lightweight grouting material of this embodiment is composed of the following components by mass: 480 parts of cement clinker, 240 parts of papermaking white mud, 480 parts of calcined clay, 300 parts of glass microspheres, 48 ​​parts of gypsum, 12 parts of polycarboxylic acid water reducer and 540 parts of water.

[0040] The main components of the cement clinker in this embodiment are 62.23wt% CaO, 22.90wt% SiO2, 6.48wt% Al2O3 and 4.41wt% Fe2O3.

[0041] The main component of the papermaking white mud in this embodiment is 94.20wt% of CaO.

[0042] The calcined clay in this embodiment is a high-temperature clay calcined at 750° C., and the main components of the calcined clay are 44.99wt% Al2O3, 45.50wt% SiO2 and 3.44wt% Fe2O3.

[0043] The main components of the gypsum in this embodiment are 61.38 wt % SO3 and 38.30 wt % CaO.

[0044] The model of the glass microspheres in this embodiment is QK-300, and the particle size of the glass microspheres is 100 to 1000 μm.

[0045] The polycarboxylic acid water-reducing agent in this embodiment is SBT-CCP ​​(Ⅰ) polycarboxylic acid high-performance water-reducing agent for prefabricated components.

[0046] The present embodiment provides a method for preparing a papermaking white mud calcined clay-based lightweight grouting material, comprising the following steps:

[0047] Step 1: Cement clinker, papermaking white mud, calcined clay and gypsum are dried at 105°C for 24 hours, then ground and passed through a 200-mesh sieve, and the sieve residue is collected;

[0048] Step 2: Evenly mix the sieved cement clinker, papermaking white mud, calcined clay, gypsum and glass beads obtained in step 1, then add the mixed water and polycarboxylate water-reducing agent mixture, and mix evenly to obtain a lightweight grouting material.

[0049] The lightweight grouting material obtained in this embodiment is poured into a mold, placed on a vibration table for vibration, smoothed, and coated on the surface. It is then cured indoors at a curing temperature of 20±5°C and a relative humidity of 90%. The curing times are 3 days, 7 days, and 28 days, respectively. The lightweight grouting material test blocks are then demolded to obtain.

[0050] Example 3

[0051] The present embodiment provides a papermaking white mud calcined clay-based lightweight grouting material and a preparation method thereof.

[0052] The papermaking white mud calcined clay-based lightweight grouting material of this embodiment is composed of the following components by mass: 480 parts of cement clinker, 180 parts of papermaking white mud, 540 parts of calcined clay, 300 parts of glass microspheres, 48 ​​parts of gypsum, 12 parts of polycarboxylic acid water reducer and 540 parts of water.

[0053] The main components of the cement clinker in this embodiment are 62.23wt% CaO, 22.90wt% SiO2, 6.48wt% Al2O3 and 4.41wt% Fe2O3.

[0054] The main component of the papermaking white mud in this embodiment is 94.20wt% of CaO.

[0055] The calcined clay in this embodiment is a high-temperature clay calcined at 750° C., and the main components of the calcined clay are 44.99wt% Al2O3, 45.50wt% SiO2 and 3.44wt% Fe2O3.

[0056] The main components of the gypsum in this embodiment are 61.38 wt % SO3 and 38.30 wt % CaO.

[0057] The model of the glass microspheres in this embodiment is QK-300, and the particle size of the glass microspheres is 100 to 1000 μm.

[0058] The polycarboxylic acid water-reducing agent in this embodiment is SBT-CCP ​​(Ⅰ) polycarboxylic acid high-performance water-reducing agent for prefabricated components.

[0059] The present embodiment provides a method for preparing a papermaking white mud calcined clay-based lightweight grouting material, comprising the following steps:

[0060] Step 1: Cement clinker, papermaking white mud, calcined clay and gypsum are dried at 105°C for 24 hours, then ground and passed through a 200-mesh sieve, and the sieve residue is collected;

[0061] Step 2: Evenly mix the sieved cement clinker, papermaking white mud, calcined clay, gypsum and glass beads obtained in step 1, then add the mixed water and polycarboxylate water-reducing agent mixture, and mix evenly to obtain a lightweight grouting material.

[0062] The lightweight grouting material obtained in this embodiment is poured into a mold, placed on a vibration table for vibration, smoothed, and coated on the surface. It is then cured indoors at a curing temperature of 20±5°C and a relative humidity of 90%. The curing times are 3 days, 7 days, and 28 days, respectively. The lightweight grouting material test blocks are then demolded to obtain.

[0063] Example 4

[0064] The present embodiment provides a papermaking white mud calcined clay-based lightweight grouting material and a preparation method thereof.

[0065] The papermaking white mud calcined clay-based lightweight grouting material of this embodiment is composed of the following components by mass: 600 parts of cement clinker, 300 parts of papermaking white mud, 300 parts of calcined clay, 300 parts of glass microspheres, 48 ​​parts of gypsum, 12 parts of polycarboxylic acid water reducer and 540 parts of water.

[0066] The main components of the cement clinker in this embodiment are 62.23wt% CaO, 22.90wt% SiO2, 6.48wt% Al2O3 and 4.41wt% Fe2O3.

[0067] The main component of the papermaking white mud in this embodiment is 94.20wt% of CaO.

[0068] The calcined clay in this embodiment is a high-temperature clay calcined at 750° C., and the main components of the calcined clay are 44.99wt% Al2O3, 45.50wt% SiO2 and 3.44wt% Fe2O3.

[0069] The main components of the gypsum in this embodiment are 61.38 wt % SO3 and 38.30 wt % CaO.

[0070] The model of the glass microspheres in this embodiment is QK-300, and the particle size of the glass microspheres is 100 to 1000 μm.

[0071] The polycarboxylic acid water-reducing agent in this embodiment is SBT-CCP ​​(Ⅰ) polycarboxylic acid high-performance water-reducing agent for prefabricated components.

[0072] The present embodiment provides a method for preparing a papermaking white mud calcined clay-based lightweight grouting material, comprising the following steps:

[0073] Step 1: Cement clinker, papermaking white mud, calcined clay and gypsum are dried at 105°C for 24 hours, then ground and passed through a 200-mesh sieve, and the sieve residue is collected;

[0074] Step 2: Evenly mix the sieved cement clinker, papermaking white mud, calcined clay, gypsum and glass beads obtained in step 1, then add the mixed water and polycarboxylate water-reducing agent mixture, and mix evenly to obtain a lightweight grouting material.

[0075] The lightweight grouting material obtained in this embodiment is poured into a mold, placed on a vibration table for vibration, smoothed, and coated on the surface. It is then cured indoors at a curing temperature of 20±5°C and a relative humidity of 90%. The curing times are 3 days, 7 days, and 28 days, respectively. The lightweight grouting material test blocks are then demolded to obtain.

[0076] Example 5

[0077] The present embodiment provides a papermaking white mud calcined clay-based lightweight grouting material and a preparation method thereof.

[0078] The papermaking white mud calcined clay-based lightweight grouting material of this embodiment is composed of the following components by mass: 600 parts of cement clinker, 200 parts of papermaking white mud, 400 parts of calcined clay, 300 parts of glass microspheres, 48 ​​parts of gypsum, 12 parts of polycarboxylic acid water reducer and 540 parts of water.

[0079] The main components of the cement clinker in this embodiment are 62.23wt% CaO, 22.90wt% SiO2, 6.48wt% Al2O3 and 4.41wt% Fe2O3.

[0080] The main component of the papermaking white mud in this embodiment is 94.20wt% of CaO.

[0081] The calcined clay in this embodiment is a high-temperature clay calcined at 750° C., and the main components of the calcined clay are 44.99wt% Al2O3, 45.50wt% SiO2 and 3.44wt% Fe2O3.

[0082] The main components of the gypsum in this embodiment are 61.38 wt % SO3 and 38.30 wt % CaO.

[0083] The model of the glass microspheres in this embodiment is QK-300, and the particle size of the glass microspheres is 100 to 1000 μm.

[0084] The polycarboxylic acid water-reducing agent in this embodiment is SBT-CCP ​​(Ⅰ) polycarboxylic acid high-performance water-reducing agent for prefabricated components.

[0085] The present embodiment provides a method for preparing a papermaking white mud calcined clay-based lightweight grouting material, comprising the following steps:

[0086] Step 1: Cement clinker, papermaking white mud, calcined clay and gypsum are dried at 105°C for 24 hours, then ground and passed through a 200-mesh sieve, and the sieve residue is collected;

[0087] Step 2: Evenly mix the sieved cement clinker, papermaking white mud, calcined clay, gypsum and glass beads obtained in step 1, then add the mixed water and polycarboxylate water-reducing agent mixture, and mix evenly to obtain a lightweight grouting material.

[0088] The lightweight grouting material obtained in this embodiment is poured into a mold, placed on a vibration table for vibration, smoothed, and coated on the surface. It is then cured indoors at a curing temperature of 20±5°C and a relative humidity of 90%. The curing times are 3 days, 7 days, and 28 days, respectively. The lightweight grouting material test blocks are then demolded to obtain.

[0089] Example 6

[0090] The present embodiment provides a papermaking white mud calcined clay-based lightweight grouting material and a preparation method thereof.

[0091] The papermaking white mud calcined clay-based lightweight grouting material of this embodiment is composed of the following components by mass: 600 parts of cement clinker, 150 parts of papermaking white mud, 450 parts of calcined clay, 300 parts of glass microspheres, 48 ​​parts of gypsum, 12 parts of polycarboxylic acid water reducer and 540 parts of water.

[0092] The main components of the cement clinker in this embodiment are 62.23wt% CaO, 22.90wt% SiO2, 6.48wt% Al2O3 and 4.41wt% Fe2O3.

[0093] The main component of the papermaking white mud in this embodiment is 94.20wt% of CaO.

[0094] The calcined clay in this embodiment is a high-temperature clay calcined at 750° C., and the main components of the calcined clay are 44.99wt% Al2O3, 45.50wt% SiO2 and 3.44wt% Fe2O3.

[0095] The main components of the gypsum in this embodiment are 61.38 wt % SO3 and 38.30 wt % CaO.

[0096] The model of the glass microspheres in this embodiment is QK-300, and the particle size of the glass microspheres is 100 to 1000 μm.

[0097] The polycarboxylic acid water-reducing agent in this embodiment is SBT-CCP ​​(Ⅰ) polycarboxylic acid high-performance water-reducing agent for prefabricated components.

[0098] The present embodiment provides a method for preparing a papermaking white mud calcined clay-based lightweight grouting material, comprising the following steps:

[0099] Step 1: Cement clinker, papermaking white mud, calcined clay and gypsum are dried at 105°C for 24 hours, then ground and passed through a 200-mesh sieve, and the sieve residue is collected;

[0100] Step 2: Evenly mix the sieved cement clinker, papermaking white mud, calcined clay, gypsum and glass beads obtained in step 1, then add the mixed water and polycarboxylate water-reducing agent mixture, and mix evenly to obtain a lightweight grouting material.

[0101] The lightweight grouting material obtained in this embodiment is poured into a mold, placed on a vibration table for vibration, smoothed, and coated on the surface. It is then cured indoors at a curing temperature of 20±5°C and a relative humidity of 90%. The curing times are 3 days, 7 days, and 28 days, respectively. The lightweight grouting material test blocks are then demolded to obtain.

[0102] Comparative Example 1

[0103] This comparative example provides a grouting material and a preparation method thereof.

[0104] The grouting material of this comparative example is composed of the following components by mass: 1200 parts of cement clinker, 300 parts of glass beads, 48 ​​parts of gypsum, 12 parts of polycarboxylic acid water reducer and 540 parts of water.

[0105] The main components of the cement clinker in this comparative example are 62.23wt% of CaO, 22.90wt% of SiO2, 6.48wt% of Al2O3 and 4.41wt% of Fe2O3.

[0106] The main components of the gypsum in this comparative example are 61.38 wt % of SO3 and 38.30 wt % of CaO.

[0107] The model of the glass microspheres in this comparative example is QK-300, and the particle size of the glass microspheres is 100 to 1000 μm.

[0108] The polycarboxylic acid water-reducing agent in this comparative example is SBT-CCP ​​(Ⅰ) polycarboxylic acid high-performance water-reducing agent for prefabricated components.

[0109] The preparation method of the grouting material of this comparative example comprises the following steps:

[0110] Step 1: Cement clinker and gypsum are dried at 105°C for 24 hours, then ground and passed through a 200-mesh sieve, and the sieve residue is collected;

[0111] Step 2: Evenly mix the sieved cement clinker, gypsum and glass beads obtained in step 1, then add the mixed water and polycarboxylate water-reducing agent mixture, and mix evenly to obtain a grouting material.

[0112] The grouting material obtained in this comparative example is poured into a mold, placed on a vibration table for vibration, smoothed, and coated on the surface. It is then cured indoors at a curing temperature of 20±5°C and a relative humidity of 90%. The curing times are 3 days, 7 days, and 28 days, respectively. The grouting material test blocks are then demoulded to obtain.

[0113] Comparative Example 2

[0114] This comparative example provides a grouting material and a preparation method thereof.

[0115] The grouting material of this comparative example is composed of the following components by mass: 480 parts of cement clinker, 480 parts of calcined clay, 240 parts of limestone powder, 300 parts of glass microspheres, 48 ​​parts of gypsum, 12 parts of polycarboxylic acid water reducer and 540 parts of water.

[0116] The main components of the cement clinker in this comparative example are 62.23wt% of CaO, 22.90wt% of SiO2, 6.48wt% of Al2O3 and 4.41wt% of Fe2O3.

[0117] The calcined clay in this comparative example is a high-temperature clay calcined at 750° C., and the main components of the calcined clay are 44.99wt% Al2O3, 45.50wt% SiO2 and 3.44wt% Fe2O3.

[0118] The main component of the limestone powder in this comparative example is 84.78 wt % of Cao.

[0119] The main components of the gypsum in this comparative example are 61.38 wt % of SO3 and 38.30 wt % of CaO.

[0120] The model of the glass microspheres in this comparative example is QK-300, and the particle size of the glass microspheres is 100 to 1000 μm.

[0121] The polycarboxylic acid water-reducing agent in this comparative example is SBT-CCP ​​(Ⅰ) polycarboxylic acid high-performance water-reducing agent for prefabricated components.

[0122] The preparation method of the grouting material of this comparative example comprises the following steps:

[0123] Step 1: Cement clinker, calcined clay, limestone powder and gypsum are dried at 105°C for 24 hours, then ground and passed through a 200-mesh sieve, and the sieve residues are collected;

[0124] Step 2: Evenly mix the sieved cement clinker, calcined clay, limestone powder, gypsum and glass beads obtained in step 1, then add the mixed water and polycarboxylate water-reducing agent mixture, mix evenly to obtain a grouting material.

[0125] The grouting material obtained in this comparative example is poured into a mold, placed on a vibration table for vibration, smoothed, and coated on the surface. It is then cured indoors at a curing temperature of 20±5°C and a relative humidity of 90%. The curing times are 3 days, 7 days, and 28 days, respectively. The grouting material test blocks are then demoulded to obtain.

[0126] Comparative Example 3

[0127] This comparative example provides a grouting material and a preparation method thereof.

[0128] The grouting material of this comparative example is composed of the following components by mass: 600 parts of cement clinker, 400 parts of calcined clay, 200 parts of limestone powder, 300 parts of glass microspheres, 48 ​​parts of gypsum, 12 parts of polycarboxylic acid water reducer and 540 parts of water.

[0129] The main components of the cement clinker in this comparative example are 62.23wt% of CaO, 22.90wt% of SiO2, 6.48wt% of Al2O3 and 4.41wt% of Fe2O3.

[0130] The calcined clay in this comparative example is a high-temperature clay calcined at 750° C., and the main components of the calcined clay are 44.99wt% Al2O3, 45.50wt% SiO2 and 3.44wt% Fe2O3.

[0131] The main component of the limestone powder in this comparative example is 84.78 wt % of Cao.

[0132] The main components of the gypsum in this comparative example are 61.38 wt % of SO3 and 38.30 wt % of CaO.

[0133] The model of the glass microspheres in this comparative example is QK-300, and the particle size of the glass microspheres is 100 to 1000 μm.

[0134] The polycarboxylic acid water-reducing agent in this comparative example is SBT-CCP ​​(Ⅰ) polycarboxylic acid high-performance water-reducing agent for prefabricated components.

[0135] The preparation method of the grouting material of this comparative example comprises the following steps:

[0136] Step 1: Cement clinker, calcined clay, limestone powder and gypsum are dried at 105°C for 24 hours, then ground and passed through a 200-mesh sieve, and the sieve residues are collected;

[0137] Step 2: Evenly mix the sieved cement clinker, calcined clay, limestone powder, gypsum and glass beads obtained in step 1, then add the mixed water and polycarboxylate water-reducing agent mixture, mix evenly to obtain a grouting material.

[0138] The grouting material obtained in this comparative example is poured into a mold, placed on a vibration table for vibration, smoothed, and coated on the surface. It is then cured indoors at a curing temperature of 20±5°C and a relative humidity of 90%. The curing times are 3 days, 7 days, and 28 days, respectively. The grouting material test blocks are then demoulded to obtain.

[0139] The performance tests were conducted on the lightweight grouting materials and test blocks prepared in Examples 1-6 and the grouting materials and test blocks prepared in Comparative Examples 1-3. The results are shown in Table 1.

[0140] Table 1

[0141]

[0142] The data comparison in Table 1 shows that the large amount of papermaking white mud has a slight adverse effect on the strength of the lightweight grouting material, but when the ratio of papermaking white mud to forging clay increases, the strength and impermeability are improved. This is because the reaction of papermaking white mud and forging clay not only generates CSH gel, but also generates a large amount of CASH gel by aluminate reaction. And forging clay has a high specific surface area, which means high activity and strong nucleation. Under the corresponding ratio of Example 5, the strength of the papermaking white mud calcined clay-based lightweight grouting material reaches a maximum value of 53.7MPa. Compared with the limestone calcined clay grouting material of the same ratio comparative example 2, the strength and impermeability are reduced, but the fluidity is improved.

[0143] Papermaking white mud calcined clay-based lightweight grouting material exhibits low creep performance due to its unique components. The main reason is that the active role of calcined clay in the grouting material can effectively reduce the volume change of the grouting material during the hardening process, thereby reducing creep. At the same time, for both drying shrinkage and plastic shrinkage, the shrinkage rate of papermaking white mud calcined clay-based lightweight grouting material is lower than that of traditional cement grouting material. This is because the kaolin component in the calcined clay provides a strong cohesive force during the hardening process, reducing the volume shrinkage caused by water evaporation. Because the fineness and particle grading are better than ordinary Portland cement, it can form a denser structure and reduce plastic shrinkage.

Claims

1. A papermaking white mud calcined clay-based lightweight grouting material, characterized in that: The invention comprises the following components in parts by weight: 480-600 parts of cement clinker, 150-360 parts of papermaking white mud, 300-540 parts of calcined clay, 300 parts of glass microspheres, 48 ​​parts of gypsum, 12 parts of polycarboxylic acid water reducer and 540 parts of water, wherein the main component of the papermaking white mud is 92-96wt% of CaO, the calcined clay is calcined metakaolin, and the main components of the calcined clay are 42-47wt% of Al2O3, 43-48wt% of SiO2 and 3.2-3.6wt% of Fe2O3.

2. A papermaking white mud calcined clay-based lightweight grouting material according to claim 1, characterized in that: The main components of the cement clinker are 60-65wt% of CaO, 20-25wt% of SiO2, 6.2-6.6wt% of Al2O3 and 4.2-4.6wt% of Fe2O3.

3. A papermaking white mud calcined clay-based lightweight grouting material according to claim 2, characterized in that: The main components of the gypsum are 61-62 wt% SO3 and 38-39 wt% CaO.

4. A papermaking white mud calcined clay-based lightweight grouting material according to claim 3, characterized in that: The model of the glass microspheres is QK-300, and the particle size of the glass microspheres is 100 to 1000 μm.

5. A papermaking white mud calcined clay-based lightweight grouting material according to claim 4, characterized in that: The polycarboxylate water reducer is SBT-CCP ​​(Ⅰ) polycarboxylate high-performance water reducer for prefabricated components.

6. A method for preparing a papermaking white mud calcined clay-based lightweight grouting material according to any one of claims 1 to 5, characterized in that: The steps include: Step 1, cement clinker, papermaking white mud, calcined clay and gypsum are dried and ground respectively, sieved and the sieved materials are collected; Step 2: Evenly mix the sieved cement clinker, papermaking white mud, calcined clay, gypsum and glass beads obtained in step 1, then add the mixed water and polycarboxylate water-reducing agent mixture, and mix evenly to obtain a lightweight grouting material.

7. The method for preparing a papermaking white mud calcined clay-based lightweight grouting material according to claim 6, characterized in that: The specific conditions for drying in step 1 are all drying at 105° C. for 24 hours.

8. The method for preparing a papermaking white mud calcined clay-based lightweight grouting material according to claim 7, characterized in that: The sieving in step 1 is all through a 200 mesh sieve.

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