Concrete for the production of prefabricated composite panels containing construction waste

Abstract

The application relates to the technical field of concrete, and particularly discloses a concrete containing building waste and used for preparing a fabricated prefabricated composite board, which is composed of the following components: water, cement, fly ash, fine aggregate, modified recycled coarse aggregate and water reducing agent; the modified recycled coarse aggregate is modified by the following method: 1) calcium stearate and zinc stearate are mixed and heated until completely melted to obtain a modifier; 2) the recycled coarse aggregate is soaked in the modifier, the recycled coarse aggregate is filtered out, and the pretreated recycled coarse aggregate is obtained after cooling; and 3) the pretreated recycled coarse aggregate is stirred and polished in corundum, and the modified recycled coarse aggregate is obtained after filtering. The application has the advantage that the concrete containing building waste and used for preparing the fabricated prefabricated composite board has improved impermeability after solidification. The application effectively consumes the building waste and reduces environmental pollution, and is relatively environment-friendly.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of concrete, in particular to a concrete containing construction waste for preparing prefabricated composite slab. BACKGROUND

[0002] The composite floor slab is a prefabricated floor slab composed of prefabricated composite slabs and cast-in-place concrete layers. The prefabricated composite slab is not only one of the components of the floor structure, but also a permanent formwork for the cast-in-place reinforced concrete composite layer. The composite floor slab has good integrity and large rigidity, can save formwork, and the upper and lower surfaces of the slab are flat, which is convenient for finishing the surface layer and is suitable for high-rise buildings and large-span buildings with high overall rigidity requirements.

[0003] With the development of science and technology, the building technology is constantly iterated, and a large amount of waste buildings are demolished and reconstructed, resulting in more and more construction waste. The construction waste is mainly concrete fragments, which is difficult to degrade and occupies a large space for storage, seriously affecting the environment. Therefore, the recycling of construction waste is particularly important.

[0004] The recycling of construction waste usually involves crushing the construction waste, screening the concrete fragments to form recycled aggregates, and incorporating the recycled aggregates formed by the construction waste into fresh concrete as aggregates to realize the recycling of construction waste. However, the recycled aggregates are formed by crushing under external force, resulting in more cracks and greater water absorption than natural aggregates, and the density of the prepared concrete material decreases. Although the application of construction waste in the preparation of prefabricated composite slab concrete can realize the recycling of construction waste and reduce environmental pollution, the prefabricated composite slab prepared therefrom has insufficient density, resulting in decreased impermeability and easy leakage of the floor slab. Therefore, there is still room for improvement. SUMMARY

[0005] In order to improve the impermeability of the concrete containing construction waste for preparing prefabricated composite slab after solidification, the present application provides a concrete containing construction waste for preparing prefabricated composite slab.

[0006] The concrete containing construction waste for preparing prefabricated composite slab provided by the present application adopts the following technical solution:

[0007] A concrete containing construction waste for preparing prefabricated composite slab is composed of the following components by mass fraction: water 100 parts;

[0008] Cement 228-232 parts;

[0009] Fly ash 33-35 parts;

[0010] Fine aggregate 435-440 parts;

[0011] Modified recycled coarse aggregate 710-720 parts;

[0012] Water reducing agent 3.6-3.8 parts;

[0013] The modified recycled coarse aggregate is modified from a recycled coarse aggregate;

[0014] The recycled coarse aggregate is crushed from construction waste;

[0015] The modification method of the modified recycled coarse aggregate is as follows:

[0016] Step 1), mix calcium stearate and zinc stearate, heat to complete melting, and obtain a modifier;

[0017] Step 2), soak the recycled coarse aggregate in the modifier, filter out the recycled coarse aggregate, and cool to obtain pretreated recycled coarse aggregate;

[0018] By using the above technical solution, the recycled aggregate is modified, the melted calcium stearate and zinc stearate mixture penetrates into the cracks of the recycled aggregate, the recycled aggregate is reinforced, the compressive strength of the recycled aggregate is improved, the density of the recycled aggregate is improved, the density of the prepared concrete is improved after solidification, the impermeability of the solidified concrete is improved, the impermeability of the prepared prefabricated laminated slab is greatly improved, and the quality is better.

[0019] By heating and melting the calcium stearate and zinc stearate mixture, the crystals formed after cooling are not calcium stearate and zinc stearate powders, but have higher structural stability and strength, and can be stably inlaid in the cracks of the recycled aggregate, and have better effect of improving the density.

[0020] By sanding, the crystals formed on the surface of the recycled aggregate are sanded off, the surface of the recycled aggregate is exposed, the sanded crystals can be fully utilized after screening, material waste is reduced, the surface of the recycled aggregate is rougher, and the bonding force between the recycled aggregate and the cement stone is better, which helps to improve the strength of the solidified concrete and the quality.

[0021] Preferably, the mass ratio of calcium stearate and zinc stearate is 1-2:3-4.

[0022] By adopting the technical scheme, the effect of modifying the recycled aggregate is better by selecting the mass ratio of calcium stearate and zinc stearate, the recycled aggregate has strong hydrophobicity and better lubricity, the prepared concrete has higher fluidity and is easier to construct.

[0023] Preferably, the mass ratio of calcium stearate and zinc stearate is 1.5:3.5.

[0024] By adopting the technical scheme, the effect of modifying the recycled aggregate is better by selecting the mass ratio of calcium stearate and zinc stearate, the recycled aggregate has strong hydrophobicity and better lubricity, the prepared concrete has higher fluidity and is easier to construct.

[0025] Preferably, in the step 2), the recycled coarse aggregate is heated and dried first and then soaked in the modifier.

[0026] By adopting the technical scheme, the effect of modifying the recycled aggregate is better by selecting the mass ratio of calcium stearate and zinc stearate, the recycled aggregate has strong hydrophobicity and better lubricity, the prepared concrete has higher fluidity and is easier to construct.

[0027] Preferably, the particle size of the recycled coarse aggregate is 25-40mm.

[0028] By adopting the technical scheme, the effect of modifying the recycled aggregate is better by selecting the mass ratio of calcium stearate and zinc stearate, the recycled aggregate has strong hydrophobicity and better lubricity, the prepared concrete has higher fluidity and is easier to construct.

[0029] Preferably, the water reducing agent is a compound of sodium lignosulfonate, calcium lignosulfonate and polycarboxylic acid water reducing agent.

[0030] By adopting the technical scheme, the effect of modifying the recycled aggregate is better by selecting the mass ratio of calcium stearate and zinc stearate, the recycled aggregate has strong hydrophobicity and better lubricity, the prepared concrete has higher fluidity and is easier to construct.

[0031] Preferably, the mass ratio of sodium lignosulfonate, calcium lignosulfonate and polycarboxylic acid water reducing agent is 1:1:3.

[0032] By adopting the technical scheme, the effect of modifying the recycled aggregate is better by selecting the mass ratio of calcium stearate and zinc stearate, the recycled aggregate has strong hydrophobicity and better lubricity, the prepared concrete has higher fluidity and is easier to construct.

[0033] Preferably, the preparation method of the concrete containing construction waste for preparing the prefabricated composite slab is as follows:

[0034] Step 01), uniformly mix water, cement, fly ash and water reducing agent to prepare a cement slurry;

[0035] Step 02), uniformly mix fine aggregate and modified recycled coarse aggregate into the cement slurry to prepare the concrete containing construction waste for preparing the prefabricated composite slab.

[0036] By adopting the technical scheme, the prepared concrete has good fluidity, and when the prefabricated composite slab is prepared, good self-compaction effect can still be realized under the blockage of the steel bars, the prepared prefabricated composite slab has high compactness and good impermeability, and is not prone to water leakage and seepage.

[0037] In summary, the present application has the following beneficial effects:

[0038] 1. In the present application, the recycled aggregate is modified, the molten calcium stearate and zinc stearate mixture penetrates into the cracks of the recycled aggregate, the recycled aggregate is reinforced, the compressive strength of the recycled aggregate is improved, the compactness of the recycled aggregate is improved, the compactness of the prepared concrete is improved after solidification, the impermeability of the solidified concrete is improved, the impermeability of the prepared prefabricated composite slab is greatly improved, and the prefabricated composite slab is not prone to water leakage, and has better quality.

[0039] 2. In the present application, the mass ratio of calcium stearate and zinc stearate is preferably selected, the modified recycled aggregate has better hydrophobicity and better lubricity, the prepared concrete has higher fluidity and is easier to construct.

[0040] 3. In the present application, the water reducing agent is formed by specifically selecting sodium lignosulfonate, calcium lignosulfonate and polycarboxylic acid water reducing agent, the water reducing effect is better, the concrete has better fluidity, higher slump, better construction performance, stronger self-compaction performance, higher compactness after solidification and better impermeability. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 It is a product schematic diagram of application example 1;

[0042] Figure 2 It is a structure installation diagram of the construction process of application example 2. DETAILED DESCRIPTION

[0043] The present application is further described in detail below in combination with embodiments.

[0044] Embodiment 1

[0045] A concrete containing construction waste for preparing a prefabricated composite panel, consisting of:

[0046] Water, cement, fly ash, fine aggregate, modified recycled coarse aggregate, water reducing agent.

[0047] Among them, the water is tap water.

[0048] Among them, the cement is purchased from Runfeng Cement, specification P.O42.5R, ordinary portland cement.

[0049] Among them, the fly ash is purchased from Lingshou County Shengyun Mineral Product Processing Plant, first-class fly ash.

[0050] Among them, the fine aggregate is purchased from Lingshou County Chaohui Mineral Product Processing Plant, river sand, 4-8 mesh.

[0051] Among them, the modified recycled coarse aggregate is modified from recycled coarse aggregate.

[0052] The recycled coarse aggregate is obtained by re-crushing and screening the concrete fragments screened from the crushed construction waste, with a particle size of 25-40 mm.

[0053] The modification method of the modified recycled coarse aggregate is as follows:

[0054] Step 1), put 100 kg of calcium stearate and 300 kg of zinc stearate into a stirring kettle, stirring at a speed of 60 r / min, continuously heating until completely melted, constant temperature 160℃, obtain modifier.

[0055] Step 2), dry the recycled coarse aggregate at 120℃ for 1h, then put it into the modifier in batches, each batch of 200 kg, stirring at a speed of 20 r / min, continuously stirring, soaking for 5 min, filter out the recycled coarse aggregate through the filter screen, then put the next batch of recycled coarse aggregate, the filtered recycled coarse aggregate is naturally cooled at room temperature, continuously vibrate on the vibrating screen during the cooling process to prevent mutual adhesion, obtain pretreated recycled coarse aggregate.

[0056] Step 3), put the pretreated recycled coarse aggregate into a stirring kettle containing 100 kg of corundum, with a particle size of 5-10 mm, stirring at a speed of 120 r / min, grinding, sample every 10 min, when the stripping rate of calcium stearate and zinc stearate mixture on the surface of the pretreated recycled coarse aggregate is greater than 90%, stop stirring, filter through the filter screen, obtain modified recycled coarse aggregate.

[0057] Calcium stearate is purchased from Wuhan Kemik Biological Medicine Technology Co., Ltd., CAS: 1592-23-0.

[0058] Zinc stearate is purchased from Wuhan Kemik Biological Medicine Technology Co., Ltd., CAS: 557-05-1.

[0059] The water reducing agent is sodium lignosulfonate, calcium lignosulfonate or polycarboxylate superplasticizer.

[0060] The sodium lignosulfonate is purchased from Shandong Mingjiang Chemical Co., Ltd.

[0061] The calcium lignosulfonate is purchased from Shandong Hongquan Chemical Technology Co., Ltd.

[0062] The polycarboxylate superplasticizer is purchased from Wuhan Runxingyuan Technology Co., Ltd., and is a general-purpose powder polycarboxylate superplasticizer.

[0063] The preparation method of the concrete containing construction waste for preparing the prefabricated composite board is as follows:

[0064] Step 01), 100 kg of water, 228 kg of cement, 33 kg of fly ash and 3.6 kg of water reducing agent are put into a stirring kettle, the stirring speed is 120 r / min, and stirring is carried out for 3 min, and then the mixture is uniformly mixed to prepare a cement slurry.

[0065] Step 02), 435 kg of fine aggregate and 710 kg of modified recycled coarse aggregate are put into the cement slurry, the stirring speed is 40 r / min, and stirring is carried out for 10 min, and then the mixture is uniformly mixed to prepare the concrete containing construction waste for preparing the prefabricated composite board.

[0066] Example 2

[0067] A concrete containing construction waste for preparing a prefabricated composite board is composed of the following components:

[0068] Water, cement, fly ash, fine aggregate, modified recycled coarse aggregate and water reducing agent.

[0069] The water is tap water.

[0070] The cement is purchased from Runfeng Cement, and the specification is P.O42.5R, ordinary portland cement.

[0071] The fly ash is purchased from Shengyun Mineral Product Processing Factory in Lingshou County, and is first-grade fly ash.

[0072] The fine aggregate is purchased from Chaohui Mineral Product Processing Factory in Lingshou County, and is river sand with a size of 4-8 meshes.

[0073] The modified recycled coarse aggregate is modified from recycled coarse aggregate.

[0074] The recycled coarse aggregate is obtained by re-crushing and screening the concrete fragments screened from the crushed construction waste, and the particle size is 25-40 mm.

[0075] The modification method of the modified recycled coarse aggregate is as follows:

[0076] Step 1), 150 kg of calcium stearate and 350 kg of zinc stearate were put into a stirring kettle, the stirring speed was 60 r / min, the stirring was continuously added to melt completely, the temperature was kept at 160℃, and the modifier was obtained.

[0077] Step 2), the recycled coarse aggregate was dried at 120℃ for 1h, then was put into the modifier in batches, the mass of each batch was 200 kg, the stirring speed was 20 r / min, the stirring was continuously added for 5 min, the recycled coarse aggregate was filtered out through a filter screen, the next batch of recycled coarse aggregate was put in, and the filtered recycled coarse aggregate was naturally cooled at room temperature. During the cooling process, the vibration screen was continuously vibrated to prevent mutual adhesion, and the pretreated recycled coarse aggregate was obtained.

[0078] Step 3), the pretreated recycled coarse aggregate was put into a stirring kettle containing 100 kg of corundum, the particle size of corundum was 5-10 mm, the stirring speed was 120 r / min, the pretreated recycled coarse aggregate was polished by stirring, and the pretreated recycled coarse aggregate was sampled and observed every 10 min. When the stripping rate of calcium stearate and zinc stearate mixture on the surface of the pretreated recycled coarse aggregate was greater than 90%, the stirring was stopped, the pretreated recycled coarse aggregate was filtered through a filter screen, and the modified recycled coarse aggregate was obtained.

[0079] The calcium stearate was purchased from Wuhan Kemike Biomedical Technology Co., Ltd., and the CAS was 1592-23-0.

[0080] The zinc stearate was purchased from Wuhan Kemike Biomedical Technology Co., Ltd., and the CAS was 557-05-1.

[0081] The water reducing agent was a compound of sodium lignosulfonate, calcium lignosulfonate, and polycarboxylic acid water reducing agent.

[0082] The sodium lignosulfonate was purchased from Shandong Mingjiang Chemical Co., Ltd.

[0083] The calcium lignosulfonate was purchased from Shandong Hongquan Chemical Technology Co., Ltd.

[0084] The polycarboxylic acid water reducing agent was purchased from Wuhan Runxingyuan Technology Co., Ltd., and was a general-purpose powder polycarboxylic acid water reducing agent.

[0085] The preparation method of the concrete containing construction waste for preparing the fabricated prefabricated composite board was as follows:

[0086] Step 01), 100 kg of water, 230 kg of cement, 34 kg of fly ash, and 3.7 kg of water reducing agent were put into a stirring kettle, the stirring speed was 120 r / min, the stirring was added for 3 min, and the cement slurry was prepared.

[0087] Step 02), 437 kg of fine aggregate and 715 kg of modified recycled coarse aggregate were put into the cement slurry, the stirring speed was 40 r / min, the stirring was added for 10 min, and the concrete containing construction waste for preparing the fabricated prefabricated composite board was prepared.

[0088] Embodiment 3

[0089] A concrete containing construction waste for preparing a prefabricated composite panel, consisting of the following components:

[0090] Water, cement, fly ash, fine aggregate, modified recycled coarse aggregate, water reducing agent.

[0091] Among them, the water is tap water.

[0092] Among them, the cement is purchased from Runfeng Cement, specification P.O42.5R, ordinary portland cement.

[0093] Among them, the fly ash is purchased from Lingshou County Shengyun Mineral Product Processing Plant, first-class fly ash.

[0094] Among them, the fine aggregate is purchased from Lingshou County Chaohui Mineral Product Processing Plant, river sand, 4-8 mesh.

[0095] Among them, the modified recycled coarse aggregate is modified from recycled coarse aggregate.

[0096] The recycled coarse aggregate is obtained by re-crushing and screening the concrete fragments screened from the crushed construction waste, with a particle size of 25-40 mm.

[0097] The modification method of the modified recycled coarse aggregate is as follows:

[0098] Step 1), put 200 kg of calcium stearate and 400 kg of zinc stearate into a stirring kettle, stirring at a speed of 60 r / min, continuously heating until completely melted, constant temperature 160℃, obtain modifier.

[0099] Step 2), dry the recycled coarse aggregate at 120℃ for 1h, then put it into the modifier in batches, each batch of 200kg, stirring at a speed of 20 r / min, continuously stirring, soaking for 5min, filter out the recycled coarse aggregate through the filter screen, then put the next batch of recycled coarse aggregate, the filtered recycled coarse aggregate is naturally cooled at room temperature, and continuously vibrated on the vibrating screen during the cooling process to prevent mutual adhesion, obtain pretreated recycled coarse aggregate.

[0100] Step 3), put the pretreated recycled coarse aggregate into a stirring kettle containing 100 kg of corundum, with a particle size of 5-10 mm, stirring at a speed of 120 r / min, grinding, sample observation every 10 min, when the stripping rate of calcium stearate and zinc stearate mixture on the surface of the pretreated recycled coarse aggregate is greater than 90%, stop stirring, filter through the filter screen, obtain modified recycled coarse aggregate.

[0101] Calcium stearate is purchased from Wuhan Kemike Biological Medicine Technology Co., Ltd., CAS: 1592-23-0.

[0102] Zinc stearate was purchased from Wuhan Kemike Biomedical Technology Co., Ltd., CAS: 557-05-1.

[0103] The water reducing agent is a combination of sodium lignosulfonate, calcium lignosulfonate, and polycarboxylate superplasticizer.

[0104] Sodium lignosulfonate was purchased from Shandong Mingjiang Chemical Co., Ltd.

[0105] Calcium lignosulfonate was purchased from Shandong Hongquan Chemical Technology Co., Ltd.

[0106] Polycarboxylate superplasticizer was purchased from Wuhan Runxingyuan Technology Co., Ltd., general-purpose powder polycarboxylate superplasticizer.

[0107] The method for preparing the concrete containing construction waste for preparing the prefabricated composite slab is as follows:

[0108] Step 01), 100 kg of water, 232 kg of cement, 35 kg of fly ash, and 3.8 kg of water reducing agent were put into a stirring kettle, the stirring speed was 120 r / min, and stirring was carried out for 3 min, and then the mixture was uniformly mixed to prepare a cement slurry.

[0109] Step 02), 440 kg of fine aggregate and 720 kg of modified recycled coarse aggregate were put into the cement slurry, the stirring speed was 40 r / min, and stirring was carried out for 10 min, and then the mixture was uniformly mixed to prepare the concrete containing construction waste for preparing the prefabricated composite slab.

[0110] Comparative Example 1

[0111] A kind of concrete containing construction waste for preparing prefabricated composite slab, which is composed of the following components:

[0112] Water, cement, fly ash, fine aggregate, recycled coarse aggregate, water reducing agent, calcium stearate, and zinc stearate.

[0113] The water is tap water.

[0114] The cement is purchased from Runfeng Cement, specification P.O42.5R, ordinary portland cement.

[0115] The fly ash is purchased from Shengyun Mineral Product Processing Factory in Lingshou County, first-grade fly ash.

[0116] The fine aggregate is purchased from Chaohui Mineral Product Processing Factory in Lingshou County, river sand, 4-8 mesh.

[0117] The recycled coarse aggregate is obtained by re-crushing and screening the concrete fragments screened from the crushed construction waste, and the particle size is 25-40 mm.

[0118] The water reducing agent is a combination of sodium lignosulfonate, calcium lignosulfonate, and polycarboxylate superplasticizer.

[0119] Sodium lignosulfonate was purchased from Shandong Mingjiang Chemical Co., Ltd.

[0120] Calcium lignosulfonate was purchased from Shandong Hongquan Chemical Technology Co., Ltd.

[0121] Polycarboxylic acid water reducing agent was purchased from Wuhan Runxingyuan Technology Co., Ltd., general-purpose powder polycarboxylic acid water reducing agent.

[0122] The preparation method of the concrete containing construction waste for preparing the fabricated precast composite board is as follows:

[0123] Step 01), 100 kg of water, 230 kg of cement, 34 kg of fly ash, 3.7 kg of water reducing agent, 3.5 kg of calcium stearate, and 7 kg of zinc stearate were put into a stirring kettle, the stirring speed was 120 r / min, and stirring was performed for 3 min, and then the mixture was uniformly mixed to prepare a cement slurry.

[0124] Step 02), 437 kg of fine aggregate and 715 kg of recycled coarse aggregate were put into the cement slurry, the stirring speed was 40 r / min, and stirring was performed for 10 min, and then the mixture was uniformly mixed to prepare the concrete containing construction waste for preparing the fabricated precast composite board.

[0125] Comparative Example 2

[0126] A kind of concrete containing construction waste for preparing the fabricated precast composite board, compared with Example 2, the only difference is that in the modification method of the modified recycled coarse aggregate, calcium stearate is used to replace zinc stearate in equal amount.

[0127] Comparative Example 3

[0128] A kind of concrete containing construction waste for preparing the fabricated precast composite board, compared with Example 2, the only difference is that in the modification method of the modified recycled coarse aggregate, zinc stearate is used to replace calcium stearate in equal amount.

[0129] Comparative Example 4

[0130] A kind of concrete containing construction waste for preparing the fabricated precast composite board, compared with Example 2, the only difference is that in the water reducing agent, sodium gluconate is used to replace sodium lignosulfonate in equal amount.

[0131] Among them, sodium gluconate was purchased from Hebei Zhuoshu Environmental Protection Technology Co., Ltd.

[0132] Comparative Example 5

[0133] A kind of concrete containing construction waste for preparing the fabricated precast composite board, compared with Example 2, the only difference is that in the water reducing agent, sodium gluconate is used to replace calcium lignosulfonate in equal amount.

[0134] The sodium gluconate is purchased from Hebei Zhuoshu Environmental Protection Technology Co., Ltd.

[0135] Comparative Example 6

[0136] A kind of concrete for preparing prefabricated composite board containing construction waste, compared with example 2, the difference is only in water reducing agent, using sodium gluconate to replace polycarboxylic acid water reducing agent in equivalent amount.

[0137] The sodium gluconate is purchased from Hebei Zhuoshu Environmental Protection Technology Co., Ltd.

[0138] Experiment 1

[0139] Performance test:

[0140] 1. Compressive strength: according to GB / T50081-2019 "standard test methods for physical and mechanical properties of concrete", the 7d compressive strength and 28d compressive strength of the sample prepared by the concrete of each example and comparative example are detected.

[0141] 2. Impermeability grade: according to GB / T50082-2009 "standard test methods for long-term performance and durability of ordinary concrete", the impermeability grade of the sample prepared by the concrete of each example and comparative example is detected by using the step-by-step pressure method in the water permeability test.

[0142] The specific detection data of experiment 1 is shown in table 1.

[0143] Table 1

[0144]

[0145]

[0146] According to the data comparison of each example and comparative example 1 in table 1, it can be obtained that the impermeability grade of the solidified concrete is greatly improved by modifying the recycled coarse aggregate through a special modification method, and the prefabricated composite board is not prone to water seepage and leakage, and the quality of the composite floor slab prepared is better.

[0147] According to the data comparison of each example and comparative examples 2 and 3 in table 1, it can be obtained that the strength of the solidified concrete is improved by specifically selecting calcium stearate and zinc stearate to compound in a specific proportion in the modified recycled coarse aggregate.

[0148] According to the data comparison of each example and comparative examples 4-6 in table 1, it can be obtained that the fluidity of the concrete is higher, the self-compacting effect is better, and the impermeability grade of the solidified concrete is higher by using sodium lignosulfonate, calcium lignosulfonate and polycarboxylic acid water reducing agent with the modified recycled aggregate, and the water seepage and leakage phenomenon is less likely to occur.

[0149] Application Example 1

[0150] The preparation method of the laminated slab is as follows:

[0151] The mold is cleaned, the mold is filled with the concrete for preparing the fabricated prefabricated laminated slab containing the construction waste, and the concrete is tamped, the post-processing is performed, the kiln curing is performed, the demolding and hoisting are performed, and the laminated slab is obtained.

[0152] The product schematic diagram of the prepared laminated slab is shown in Figure 1 .

[0153] Application Example 2

[0154] The hoisting process of the laminated slab is as follows:

[0155] S1, support frame erection: determine the bottom elevation of the laminated slab, and adjust the support frame to the design elevation. The support spacing is not more than 1.5 m, and the distance from the slab end is not more than 500 mm. Double-sided glue is pasted on the edge of the aluminum mold support to prevent slurry leakage.

[0156] S2, test hoisting: the safety officer stands beside, the hook is hung by the cable worker, and the traction rope is tied. After the cable worker moves to the safety area, the signal worker confirms the safety situation around the component, and confirms that the test hoisting and hoisting are correct. The signal worker commands slow lifting, and stops lifting when the lifting distance from the ground is about 0.5 m. The performance of the tower crane brake, lifting appliance, and rigging are checked for reliability, and the formal hoisting process is confirmed to be correct.

[0157] S3, lifting: the laminated slab is hoisted by not less than 4 hoisting points, and the 4 hoisting points are required to be uniformly stressed. The horizontal angle of the hoisting cable should not be less than 60°, and should not be less than 45°. The main hook position of the hoisting equipment, the lifting appliance, and the component center of gravity are overlapped in the vertical direction. The hoisting process should be smooth, and the operation mode of slow lifting, stable lifting, and slow release should be adopted. There should be no deviation, swing, and torsion.

[0158] S4, landing: the traction rope is caught by the hoisting worker near the installation position, the component is pulled to the upper part of the installation position, and is slowly lowered. A slight pause is made at 0.5 m above the working layer, the position is adjusted, the direction of the installation arrow on the slab is ensured to be accurate, and the landing is guided by two hoisting workers.

[0159] S5, adjustment: the laminated slab is adjusted using a pry bar after landing, and the laminated slab is fitted into the beam by 10 mm. The error is not more than ±3 mm. The laminated slab bottom elevation is reviewed using a leveling instrument and a level, and the error is not more than ±5 mm by adjusting the aluminum mold support.

[0160] S6, continue to install other laminated slabs in sequence.

[0161] S7, cast-in-place beam steel binding: first place the beam reinforcement. Draw the stirrup position on the beam reinforcement with chalk. Break the stirrup and load it from the side of the beam. Bind the stirrup with the beam reinforcement. Thread the bottom reinforcement from one end of the beam, one person guides in front with a hook, and one person pushes the reinforcement from behind. Raise the beam reinforcement and bind the bottom reinforcement.

[0162] S8, check the stress of the support frame, check the flatness and height of the composite slab, and adjust in time if it does not meet the design requirements.

[0163] The structural installation diagram of the composite slab construction process is shown in Figure 2 .

[0164] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A concrete containing construction waste for manufacturing a fabricated precast composite slab, characterized by: consists of the following components in parts by mass: water 100 parts; cement 228-232 parts; fly ash 33-35 parts; fine aggregate 435-440 parts; modified recycled coarse aggregate 710-720 parts; water reducing agent 3.6-3.8 parts; the modified recycled coarse aggregate is modified from recycled coarse aggregate; the recycled coarse aggregate is crushed from construction waste; the modification method of the modified recycled coarse aggregate is as follows: Step 1), mix calcium stearate and zinc stearate, heat to complete melting, and obtain a modifier; Step 2), soak the recycled coarse aggregate in the modifier, filter out the recycled coarse aggregate, cool, and obtain pretreated recycled coarse aggregate; Step 3), put the pretreated recycled coarse aggregate into the emery and stir to polish until the calcium stearate and zinc stearate mixture on the surface of the pretreated recycled coarse aggregate is stripped off, filter, and obtain modified recycled coarse aggregate; the mass ratio of calcium stearate and zinc stearate is 1-2:3-4; the water reducing agent is a compound of sodium lignosulfonate, calcium lignosulfonate, and polycarboxylic acid water reducing agent.

2. A concrete containing construction waste for manufacturing a fabricated precast composite slab according to claim 1, characterized in that: the mass ratio of calcium stearate and zinc stearate is 1.5:3.

5.

3. A concrete containing construction waste for manufacturing a fabricated precast composite slab according to claim 1, characterized in that: In step 2), the recycled coarse aggregate is heated and dried before being soaked in the modifier.

4. A concrete containing construction waste for manufacturing a fabricated precast composite slab according to claim 1, characterized in that: The particle size of the recycled coarse aggregate is 25-40 mm.

5. A concrete containing construction waste for manufacturing a fabricated precast composite slab according to claim 1, characterized in that: The mass ratio of sodium lignosulfonate, calcium lignosulfonate, and polycarboxylic acid water reducing agent is 1:1:

3.

6. A concrete containing construction waste for manufacturing a fabricated precast composite slab according to claim 1, characterized in that: The preparation method of the concrete containing construction waste for preparing the fabricated prefabricated composite board is as follows: Step 01), mix water, cement, fly ash, and water reducing agent to prepare a cement slurry; Step 02), put fine aggregate and modified recycled coarse aggregate into the cement slurry, mix well, and prepare concrete containing construction waste for preparing fabricated prefabricated composite boards.

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