Lightweight insulating concrete and method for its production

Abstract

The application relates to the technical field of concrete, and particularly discloses light-weight heat-insulating concrete and a preparation method thereof. The light-weight heat-insulating concrete is formed by pouring and curing concrete mixing materials; the concrete mixing materials comprise the following components in mass fractions: 100 parts of water, 180-185 parts of cement, 34-36 parts of fly ash, 680-700 parts of aggregate, 450-470 parts of hollow glass microbeads, 2.5-2.7 parts of water reducing agent and 3.3-3.5 parts of reinforcing aid; the reinforcing aid is composed of polyvinylpyrrolidone, polyhydroxybutyrate and tributyl phosphate. The application has the advantages of improving the heat-insulating performance of the concrete and reducing the strength loss.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of concrete, in particular to a light thermal insulation concrete and a preparation method thereof. BACKGROUND

[0002] Concrete is a main building material, has high plasticity, and has high strength after solidification, and is widely used in various building structures.

[0003] With the increase of building function requirements, more requirements are put forward for the performance of concrete, among which, thermal insulation performance is one of the widely needed performances in buildings, and thermal insulation concrete is a commonly used concrete material in buildings that needs to have thermal insulation performance.

[0004] Light thermal insulation concrete mainly reduces the density of concrete to form more closed pores in the concrete, thereby achieving the effect of reducing the weight of the concrete while providing thermal insulation of the concrete. The existing light thermal insulation concrete mainly adds air entraining agent to form a large number of pores in the concrete after solidification, thereby achieving light thermal insulation. However, this light thermal insulation concrete reduces the density of the concrete, which causes the strength of the concrete to decrease accordingly, so that the concrete obtains thermal insulation performance while losing strength, which is difficult to meet the needs of construction, and therefore, there is still room for improvement. SUMMARY

[0005] In order to improve the thermal insulation performance of concrete while reducing the loss of strength, the present application provides a light thermal insulation concrete and a preparation method thereof.

[0006] In a first aspect, the present application provides a light thermal insulation concrete, which adopts the following technical scheme:

[0007] A light thermal insulation concrete is formed by pouring and curing a concrete mixture;

[0008] The concrete mixture comprises the following components by mass fraction:

[0009] 100 parts of water;

[0010] 180-185 parts of cement;

[0011] 34-36 parts of fly ash;

[0012] 680-700 parts of aggregate;

[0013] 450-470 parts of hollow glass microspheres;

[0014] 2.5-2.7 parts of water reducing agent;

[0015] 3.3-3.5 parts of reinforcing aid;

[0016] The reinforcing auxiliary agent is compounded by polyvinylpyrrolidone, polyhydroxybutyrate and tributyl phosphate.

[0017] By adopting the technical scheme, the hollow glass microbeads are added to form a large number of closed holes, so that the density of the concrete is reduced after solidification, the mass is lighter, the heat insulation performance is significantly improved, and the reinforcing auxiliary agent compounded by polyvinylpyrrolidone, polyhydroxybutyrate and tributyl phosphate is added, so that the concrete has higher strength after solidification, the bonding strength of the cement stone and the aggregate is effectively improved, the compressive and flexural strength of the solidified concrete is higher, the structural stability is higher, the effect of improving the heat preservation and heat insulation performance while reducing the strength decrease is realized, and the needs of various projects can be better met, and the application range is wider.

[0018] Preferably, the mass ratio of the polyvinylpyrrolidone, polyhydroxybutyrate and tributyl phosphate is 7-9:1-3:9-11.

[0019] By adopting the technical scheme, the mass ratio of the polyvinylpyrrolidone, polyhydroxybutyrate and tributyl phosphate is specifically selected, the effect of modifying the strength of the concrete is better, the strength of the concrete is higher after solidification, and the effects of heat insulation and high strength are better.

[0020] Preferably, the mass ratio of the polyvinylpyrrolidone, polyhydroxybutyrate and tributyl phosphate is 8:2:10.

[0021] By adopting the technical scheme, the mass ratio of the polyvinylpyrrolidone, polyhydroxybutyrate and tributyl phosphate is specifically selected, the strength of the concrete prepared is higher, and the strength loss caused by the decrease of the compactness of the concrete is better compensated, so that the concrete has good heat insulation performance and higher strength after solidification.

[0022] Preferably, the water reducing agent is a compound of industrial white sugar and sodium gluconate.

[0023] By adopting the technical scheme, the compound of the industrial white sugar and the sodium gluconate is specifically selected, the water reducing effect is better, the construction performance is better, and the strength after solidification is higher.

[0024] Preferably, the mass ratio of the industrial white sugar and the sodium gluconate is 5-7:3-5.

[0025] By adopting the technical scheme, the mass ratio of the industrial white sugar and the sodium gluconate is specifically selected, the fluidity of the concrete is higher, the construction performance is better, and the economic value is higher.

[0026] Preferably, the aggregate is a compound of coarse aggregate A, coarse aggregate B and coarse aggregate C, the particle size of the coarse aggregate A is 5-10mm, the particle size of the coarse aggregate B is 10-15mm, and the particle size of the coarse aggregate C is 15-20mm.

[0027] By adopting the above technical scheme, the large-pore porosity is reduced by the aggregate particle size matching, thereby reducing the local weak points, so that the strength of the solidified concrete is higher and the quality is better.

[0028] Preferably, the mass ratio of the coarse aggregate A, the coarse aggregate B and the coarse aggregate C is 4-6:3-5:2-4.

[0029] By adopting the above technical scheme, the mass ratio of the coarse aggregate A, the coarse aggregate B and the coarse aggregate C is specifically selected, so that the internal pore distribution of the solidified concrete is more uniform, the strength is higher, and the quality is better.

[0030] In a second aspect, the application provides a preparation method of the lightweight thermal insulation concrete, which adopts the following technical scheme:

[0031] The preparation method of the lightweight thermal insulation concrete comprises the following steps:

[0032] Step 1), uniformly mixing cement, fly ash, aggregate and hollow glass microbeads to obtain a premix;

[0033] Step 2), uniformly mixing water-reducing agent, reinforcing aid and water to obtain concrete mixture;

[0034] Step 3), pouring the concrete mixture into a mold, curing and solidifying to obtain the lightweight thermal insulation concrete.

[0035] By adopting the above technical scheme, the prepared concrete has high thermal insulation performance and high strength, reduces the strength loss caused by the decrease in density, has good quality, can meet the needs of more projects, and has a wider application range.

[0036] In summary, the application has the following beneficial effects:

[0037] 1. Since the hollow glass microbeads are added in the application, a large number of closed pores are formed, so that the density of the solidified concrete is reduced, the quality is lighter, the thermal insulation performance is significantly improved, and the reinforcing aid composed of polyvinylpyrrolidone, polyhydroxybutyrate and tributyl phosphate is added, so that the solidified concrete has higher strength, effectively improves the bonding strength of the cement stone and the aggregate, the compressive and flexural strength of the solidified concrete is higher, has higher structural stability, realizes the effect of improving the thermal insulation performance while reducing the strength decrease, can better meet the needs of various projects, and has a wide application range.

[0038] 2, In the application, the strength of the modified concrete is better by specifically selecting the mass ratio of polyvinylpyrrolidone, polyhydroxybutyrate and tributyl phosphate, so that the strength of the cured concrete is higher, and the effects of heat insulation and high strength are better.

[0039] 3, In the application, the strength of the cured concrete is higher and the quality is better by reducing large-pore pores through the particle size of the aggregate, thereby reducing local weak points. DETAILED DESCRIPTION

[0040] The application will be further described in detail below in combination with examples.

[0041] Example 1

[0042] A lightweight thermal insulation concrete is formed by pouring and curing a concrete mixture.

[0043] The concrete mixture is composed of the following components:

[0044] Water, cement, fly ash, aggregate, hollow glass beads, water reducing agent, reinforcing aid.

[0045] Among them, the cement is ordinary portland cement, Runfeng cement, and the factory specification is P.O42.5R.

[0046] Among them, the fly ash is purchased from Shijiazhuang Yuanjing Mineral Products Co., Ltd., and is a secondary fly ash.

[0047] Among them, the aggregate is a complex of coarse aggregate A, coarse aggregate B and coarse aggregate C; the particle size of the coarse aggregate A is 5-10mm, the particle size of the coarse aggregate B is 10-15mm, and the particle size of the coarse aggregate C is 15-20mm; the mass ratio of the coarse aggregate A, the coarse aggregate B and the coarse aggregate C is 4:3:2.

[0048] The coarse aggregate A, the coarse aggregate B and the coarse aggregate C are all crushed stones, purchased from Shijiazhuang Yuanjing Mineral Products Co., Ltd., and are basalt machine-made stones.

[0049] Among them, the hollow glass beads are purchased from Luoshan County Haode Insulation Material Co., Ltd., and are 90-120 mesh.

[0050] Among them, the water reducing agent is a complex of industrial white sugar and sodium gluconate; the mass ratio of industrial white sugar and sodium gluconate is 5:3.

[0051] Industrial white sugar is purchased from Jinan Hongwen Culture Industry Co., Ltd.

[0052] Sodium gluconate is purchased from Xi'an Laviva Biotechnology Co., Ltd., and the CAS number is 527-07-1.

[0053] The reinforcing aid is a compound of polyvinylpyrrolidone, polyhydroxybutyrate and tributyl phosphate, and the mass ratio of polyvinylpyrrolidone, polyhydroxybutyrate and tributyl phosphate is 7:1:9.

[0054] The polyvinylpyrrolidone is purchased from Xiamen Xiangde Highest Chemical Product Co., Ltd., and the CAS number is 9003-39-8.

[0055] The polyhydroxybutyrate is purchased from Baoji Chen Guang Biological Technology Co., Ltd., and the CAS number is 26744-04-7.

[0056] The tributyl phosphate is purchased from Shandong Duohe Chemical Co., Ltd., and the CAS number is 126-73-8.

[0057] The preparation method of the lightweight thermal insulation concrete is as follows:

[0058] Step 1), 180 kg of cement, 34 kg of fly ash, 680 kg of aggregate and 450 kg of hollow glass microspheres are put into a stirring kettle, the stirring speed is 60 r / min, and stirring is performed for 10 min, so that the mixture is uniformly mixed to obtain a premix.

[0059] Step 2), 2.5 kg of water reducing agent, 3.3 kg of reinforcing aid and 100 kg of water are put into the premix, the stirring speed is 60 r / min, and stirring is performed for 3 min, so that the mixture is uniformly mixed to obtain a concrete mixture.

[0060] Step 3), the concrete mixture is poured into a mold, water is sprayed for curing for 3 d, demolding is performed, water is sprayed for curing for 7 d, and natural curing is performed for 28 d to obtain the lightweight thermal insulation concrete.

[0061] Example 2

[0062] A lightweight thermal insulation concrete is poured and cured from a concrete mixture.

[0063] The concrete mixture is composed of the following components:

[0064] Water, cement, fly ash, aggregate, hollow glass microspheres, water reducing agent and reinforcing aid.

[0065] The cement is ordinary Portland cement, and the factory specification is P.O42.5R.

[0066] The fly ash is purchased from Shijiazhuang Yuanjing Mineral Product Co., Ltd., and is a secondary fly ash.

[0067] The aggregate is a compound of coarse aggregate A, coarse aggregate B and coarse aggregate C, the particle size of the coarse aggregate A is 5-10 mm, the particle size of the coarse aggregate B is 10-15 mm, and the particle size of the coarse aggregate C is 15-20 mm, and the mass ratio of the coarse aggregate A, the coarse aggregate B and the coarse aggregate C is 5:4:3.

[0068] Coarse aggregate A, coarse aggregate B, coarse aggregate C are all gravel, purchased from Shijiazhuang Yuanjing Mineral Products Co., Ltd.

[0069] Among them, hollow glass beads are purchased from Luoshan County Haode Thermal Insulation Material Co., Ltd., 90-120 mesh.

[0070] Among them, the water reducing agent is a compound of industrial white sugar and sodium gluconate; the mass ratio of industrial white sugar and sodium gluconate is 6:4.

[0071] Industrial white sugar is purchased from Jinan Hongwen Culture Co., Ltd.

[0072] Sodium gluconate is purchased from Xi'an Laviva Biotechnology Co., Ltd., CAS No.: 527-07-1.

[0073] Among them, the reinforcing aid is a compound of polyvinylpyrrolidone, polyhydroxybutyrate, and tributyl phosphate; the mass ratio of polyvinylpyrrolidone, polyhydroxybutyrate, and tributyl phosphate is 8:2:10.

[0074] Polyvinylpyrrolidone is purchased from Xiamen Xiangde Above Chemical Product Co., Ltd., CAS No.: 9003-39-8.

[0075] Polyhydroxybutyrate is purchased from Baoji Chen Guang Biotechnology Co., Ltd., CAS No.: 26744-04-7.

[0076] Tributyl phosphate is purchased from Shandong Poly Chemical Co., Ltd., CAS No.: 126-73-8.

[0077] The preparation method of the light thermal insulation concrete is as follows:

[0078] Step 1), 182 kg of cement, 35 kg of fly ash, 690 kg of aggregate, and 460 kg of hollow glass beads are put into a stirring kettle, the stirring speed is 60 r / min, and stirring is carried out for 10 min, and then the mixture is uniformly mixed to obtain a premix.

[0079] Step 2), 2.6 kg of water reducing agent, 3.4 kg of reinforcing aid, and 100 kg of water are added to the premix, the stirring speed is 60 r / min, and stirring is carried out for 3 min, and then the mixture is uniformly mixed to obtain a concrete mixture.

[0080] Step 3), the concrete mixture is poured into a mold, watered for 3 days, demolded, watered for 7 days, and naturally cured for 28 days to obtain a light thermal insulation concrete.

[0081] Example 3

[0082] A light thermal insulation concrete is poured and cured from a concrete mixture.

[0083] The concrete mixture is composed of the following components:

[0084] Water, cement, fly ash, aggregate, hollow glass beads, water reducing agent, reinforcing aid.

[0085] Among them, the cement is ordinary portland cement, Runfeng cement, and the factory specification is P.O42.5R.

[0086] Among them, the fly ash is purchased from Shijiazhuang Yuanjing Mineral Products Co., Ltd., and is secondary fly ash.

[0087] Among them, the aggregate is a complex of coarse aggregate A, coarse aggregate B, and coarse aggregate C; the particle size of the coarse aggregate A is 5-10mm, the particle size of the coarse aggregate B is 10-15mm, and the particle size of the coarse aggregate C is 15-20mm; the mass ratio of the coarse aggregate A, the coarse aggregate B, and the coarse aggregate C is 6:5:4.

[0088] The coarse aggregate A, the coarse aggregate B, and the coarse aggregate C are all crushed stones, purchased from Shijiazhuang Yuanjing Mineral Products Co., Ltd., and are basalt machine-made stones.

[0089] Among them, the hollow glass beads are purchased from Luoshan County Haode Thermal Insulation Material Co., Ltd., and are 90-120 mesh.

[0090] Among them, the water reducing agent is a complex of industrial white sugar and sodium gluconate; the mass ratio of the industrial white sugar and the sodium gluconate is 7:5.

[0091] The industrial white sugar is purchased from Jinan Hongwen Culture Industry Co., Ltd.

[0092] The sodium gluconate is purchased from Xi'an Laviva Biological Technology Co., Ltd., and the CAS number is 527-07-1.

[0093] Among them, the reinforcing aid is a complex of polyvinylpyrrolidone, polyhydroxybutyrate, and tributyl phosphate; the mass ratio of the polyvinylpyrrolidone, the polyhydroxybutyrate, and the tributyl phosphate is 9:3:11.

[0094] The polyvinylpyrrolidone is purchased from Xiamen Xiangde Above Chemical Product Co., Ltd., and the CAS number is 9003-39-8.

[0095] The polyhydroxybutyrate is purchased from Baoji Chen Guang Biological Technology Co., Ltd., and the CAS number is 26744-04-7.

[0096] The tributyl phosphate is purchased from Shandong Duoli Chemical Co., Ltd., and the CAS number is 126-73-8.

[0097] The preparation method of the lightweight thermal insulation concrete is as follows:

[0098] Step 1), 185 kg of cement, 36 kg of fly ash, 700 kg of aggregate, and 470 kg of hollow glass microspheres were put into a stirring kettle, stirred at a speed of 60 r / min for 10 min, and uniformly mixed to obtain a premix.

[0099] Step 2), 2.7 kg of water reducing agent, 3.5 kg of reinforcing aid, and 100 kg of water were put into the premix, stirred at a speed of 60 r / min for 3 min, and uniformly mixed to obtain a concrete mixture.

[0100] Step 3), the concrete mixture was poured into a mold, watered for 3 d, demolded, watered for 7 d, and naturally cured for 28 d to obtain the lightweight thermal insulation concrete.

[0101] Example 4

[0102] A lightweight thermal insulation concrete is poured and cured from a concrete mixture.

[0103] The concrete mixture is composed of the following components:

[0104] water, cement, fly ash, aggregate, hollow glass microspheres, water reducing agent, and reinforcing aid.

[0105] The cement is ordinary portland cement, Runfeng cement, and the factory specification is P.O42.5R.

[0106] The fly ash is purchased from Shijiazhuang Yuancheng Mineral Products Co., Ltd., and is secondary fly ash.

[0107] The aggregate is a complex of coarse aggregate A, coarse aggregate B, and coarse aggregate C; the particle size of the coarse aggregate A is 5-10 mm, the particle size of the coarse aggregate B is 10-15 mm, and the particle size of the coarse aggregate C is 15-20 mm; and the mass ratio of the coarse aggregate A, the coarse aggregate B, and the coarse aggregate C is 5:4:3.

[0108] The coarse aggregate A, the coarse aggregate B, and the coarse aggregate C are all crushed stones, purchased from Shijiazhuang Yuancheng Mineral Products Co., Ltd., and are basalt machine-made stones.

[0109] The hollow glass microspheres are purchased from Luoshan County Haode Insulation Material Co., Ltd., and are 90-120 mesh.

[0110] The water reducing agent is a complex of industrial white sugar and sodium gluconate; and the mass ratio of the industrial white sugar and the sodium gluconate is 6:4.

[0111] The industrial white sugar is purchased from Jinan Hongwen Culture Industry Co., Ltd.

[0112] The sodium gluconate is purchased from Xi'an Laviva Biological Technology Co., Ltd., and the CAS number is 527-07-1.

[0113] The reinforcing aid is a compound of polyvinylpyrrolidone, polyhydroxybutyrate and tributyl phosphate, and the mass ratio of polyvinylpyrrolidone, polyhydroxybutyrate and tributyl phosphate is 5:4:8.

[0114] The polyvinylpyrrolidone is purchased from Xiamen Xiangde Chushang Chemical Co., Ltd., and the CAS number is 9003-39-8.

[0115] The polyhydroxybutyrate is purchased from Baoji Chen Guang Biological Technology Co., Ltd., and the CAS number is 26744-04-7.

[0116] The tributyl phosphate is purchased from Shandong Duohe Chemical Co., Ltd., and the CAS number is 126-73-8.

[0117] The preparation method of the light thermal insulation concrete is as follows:

[0118] Step 1), 182 kg of cement, 35 kg of fly ash, 690 kg of aggregate and 460 kg of hollow glass microspheres are put into a stirring kettle, the stirring speed is 60 r / min, and stirring is carried out for 10 min, so that the mixture is uniformly mixed to obtain a premix.

[0119] Step 2), 2.6 kg of water reducing agent, 3.4 kg of reinforcing aid and 100 kg of water are put into the premix, the stirring speed is 60 r / min, and stirring is carried out for 3 min, so that the mixture is uniformly mixed to obtain a concrete mixture.

[0120] Step 3), the concrete mixture is poured into a mold, water is sprayed for curing for 3 days, demolding is carried out, water is sprayed for curing for 7 days, and natural curing is carried out for 28 days, so that the light thermal insulation concrete is obtained.

[0121] Example 5

[0122] A light thermal insulation concrete is poured and cured from a concrete mixture.

[0123] The concrete mixture is composed of the following components:

[0124] Water, cement, fly ash, aggregate, hollow glass microspheres, water reducing agent and reinforcing aid.

[0125] The cement is ordinary Portland cement, and the factory specification is P.O42.5R.

[0126] The fly ash is purchased from Shijiazhuang Yuanjing Mineral Products Co., Ltd., and is a secondary fly ash.

[0127] The aggregate is a compound of coarse aggregate A, coarse aggregate B and coarse aggregate C, the particle size of the coarse aggregate A is 5-10 mm, the particle size of the coarse aggregate B is 10-15 mm, and the particle size of the coarse aggregate C is 15-20 mm, and the mass ratio of the coarse aggregate A, the coarse aggregate B and the coarse aggregate C is 5:4:3.

[0128] Coarse aggregate A, coarse aggregate B, coarse aggregate C are all gravel, purchased from Shijiazhuang Yuanjing Mineral Products Co., Ltd., basalt machine-made stone.

[0129] Among them, hollow glass beads are purchased from Luoshan County Haode Thermal Insulation Material Co., Ltd., 90-120 mesh.

[0130] Among them, the water reducing agent is a compound of industrial white sugar and sodium gluconate; the mass ratio of industrial white sugar and sodium gluconate is 6:4.

[0131] Industrial white sugar is purchased from Jinan Hongwen Culture Co., Ltd.

[0132] Sodium gluconate is purchased from Xi'an Laviva Biotechnology Co., Ltd., CAS No.: 527-07-1.

[0133] Among them, the reinforcing aid is a compound of polyvinylpyrrolidone, polyhydroxybutyrate, and tributyl phosphate; the mass ratio of polyvinylpyrrolidone, polyhydroxybutyrate, and tributyl phosphate is 10:1:12.

[0134] Polyvinylpyrrolidone is purchased from Xiamen Xiangde Above Chemical Product Co., Ltd., CAS No.: 9003-39-8.

[0135] Polyhydroxybutyrate is purchased from Baoji Chen Guang Biotechnology Co., Ltd., CAS No.: 26744-04-7.

[0136] Tributyl phosphate is purchased from Shandong Poly Chemical Co., Ltd., CAS No.: 126-73-8.

[0137] The preparation method of the lightweight thermal insulation concrete is as follows:

[0138] Step 1), 182 kg of cement, 35 kg of fly ash, 690 kg of aggregate, and 460 kg of hollow glass beads are put into a stirring kettle, the stirring speed is 60 r / min, and stirring is carried out for 10 min, and then the mixture is uniformly mixed to obtain a premix.

[0139] Step 2), 2.6 kg of water reducing agent, 3.4 kg of reinforcing aid, and 100 kg of water are added to the premix, the stirring speed is 60 r / min, and stirring is carried out for 3 min, and then the mixture is uniformly mixed to obtain a concrete mixture.

[0140] Step 3), the concrete mixture is poured into a mold, watered for 3 days, demolded, watered for 7 days, and naturally cured for 28 days to obtain a lightweight thermal insulation concrete.

[0141] Comparative Example 1

[0142] A lightweight thermal insulation concrete, compared with Example 2, only differs in that:

[0143] In the reinforcing aid, polyvinyl alcohol is used to replace polyvinylpyrrolidone in equal amount.

[0144] The polyvinyl alcohol is commercially available, and its CAS number is 9002-89-5.

[0145] Comparative Example 2

[0146] A lightweight thermal insulation concrete, compared with Example 2, only differs in that:

[0147] In the reinforcing aid, polyacrylamide is used to replace polyhydroxybutyric acid in equal amount.

[0148] The polyacrylamide is commercially available, and its CAS number is 9003-05-8.

[0149] Comparative Example 3

[0150] A lightweight thermal insulation concrete, compared with Example 2, only differs in that:

[0151] In the reinforcing aid, stearic acid is used to replace tributyl phosphate in equal amount.

[0152] The stearic acid is commercially available, and its CAS number is 57-11-4.

[0153] Comparative Example 4

[0154] A lightweight thermal insulation concrete, compared with Example 2, only differs in that:

[0155] In the reinforcing aid, polyvinyl alcohol is used to replace polyvinylpyrrolidone in equal amount.

[0156] In the reinforcing aid, polyacrylamide is used to replace polyhydroxybutyric acid in equal amount.

[0157] In the reinforcing aid, stearic acid is used to replace tributyl phosphate in equal amount.

[0158] The polyvinyl alcohol is commercially available, and its CAS number is 9002-89-5.

[0159] The polyacrylamide is commercially available, and its CAS number is 9003-05-8.

[0160] The stearic acid is commercially available, and its CAS number is 57-11-4.

[0161] Comparative Example 5

[0162] A lightweight thermal insulation concrete, compared with Example 2, only differs in that:

[0163] River sand is used to replace hollow glass microbeads in equal amount.

[0164] The river sand is commercially available, and its size is 40-70 mesh.

[0165] Experiment 1

[0166] According to GB / T 50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete", the 7d compressive strength (standard test piece), 28d compressive strength (standard test piece), 28d flexural strength (standard test piece), and 28d thermal conductivity of the concrete mixture prepared in step 2) in each example and the comparative example were detected.

[0167] The specific detection data of Experiment 1 are shown in Table 1.

[0168] Table 1

[0169]

[0170] According to the data comparison in Table 1, by adding the reinforcing additive compounded by polyvinylpyrrolidone, polyhydroxybutyrate, and tributyl phosphate, the strength of the concrete can be effectively improved, so that the compressive strength of each example with a large amount of hollow glass microbeads is similar to that of Comparative Example 5 in which river sand is used to replace the hollow glass microbeads. When the mass ratio of polyvinylpyrrolidone, polyhydroxybutyrate, and tributyl phosphate is changed (Examples 4-5), the compressive strength decreases to a certain extent. When other additives are used to replace one or all of polyvinylpyrrolidone, polyhydroxybutyrate, and tributyl phosphate (Comparative Examples 1-4), the compressive strength decreases significantly. It can be seen that when polyvinylpyrrolidone, polyhydroxybutyrate, and tributyl phosphate are compounded in a specific ratio to form a reinforcing additive, the concrete material prepared has high thermal insulation performance while maintaining high strength and high structural stability, better adapting to various engineering needs and having a wider application range.

[0171] The specific embodiments are merely 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, and 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 lightweight insulating concrete, characterized by: The lightweight heat-insulating concrete is formed by pouring and curing the concrete mixture; The concrete mixture comprises the following components in mass fraction: water 100 parts; cement 180-185 parts; fly ash 34-36 parts; aggregate 680-700 parts; hollow glass microbeads 450-470 parts; water reducing agent 2.5-2.7 parts; reinforcing aid 3.3-3.5 parts; The reinforcing aid is compounded by polyvinylpyrrolidone, polyhydroxybutyrate and tributyl phosphate; The mass ratio of the polyvinylpyrrolidone, polyhydroxybutyrate and tributyl phosphate is 7-9:1-3:9-11.

2. A lightweight insulating concrete according to claim 1, characterised in that: The mass ratio of the polyvinylpyrrolidone, polyhydroxybutyrate and tributyl phosphate is 8:2:

10.

3. A lightweight insulating concrete according to claim 1, characterised in that: The water reducing agent is a compound of industrial white sugar and sodium gluconate.

4. A lightweight insulating concrete according to claim 3, characterised in that: The mass ratio of the industrial white sugar and sodium gluconate is 5-7:3-5.

5. A lightweight insulating concrete according to claim 1, characterised in that: The aggregate is a compound of coarse aggregate A, coarse aggregate B and coarse aggregate C, the particle size of the coarse aggregate A is 5-10 mm, the particle size of the coarse aggregate B is 10-15 mm, and the particle size of the coarse aggregate C is 15-20 mm.

6. A lightweight insulating concrete according to claim 5, characterised in that: The mass ratio of the coarse aggregate A, coarse aggregate B and coarse aggregate C is 4-6:3-5:2-4.

7. A method of manufacturing lightweight thermal concrete according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: Step 1), uniformly mixing cement, fly ash, aggregate and hollow glass microbeads to obtain a premix; Step 2), uniformly mixing water reducing agent, reinforcing aid and water to obtain a concrete mixture; Step 3), pouring the concrete mixture into a mold, curing and solidifying to obtain the lightweight heat-insulating concrete.

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