A kind of pumping foam concrete mixture and preparation method thereof
By using composite foaming agent and composite foam stabilizer in foam concrete, the problem of bubbles prone to burst during the pumping process of foam concrete is solved, and the stability and strength of foam concrete are improved, which is suitable for pumping construction processes.
Patent Information
- Application Number
- CN202411986959.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-04-08
AI Technical Summary
The bubbles of foam concrete are prone to burst during pumping, resulting in uneven structure and reduced strength, making it difficult to be suitable for pumping construction processes.
A composite foaming agent composed of sodium dodecyl sulfate and sodium alkenyl sulfonate is used to combine a composite foam stabilizing agent composed of cyclohexyl methacrylate, octadecyl acrylate, sodium isophthalate-5-sulfonate and octadecyl trimethylammonium chloride to produce uniformly distributed fine foams through stirring to improve the stability of the foam.
It effectively improves the stability and uniform distribution of foam in the pumped foam concrete mixture, improves the strength and quality of the cured foam concrete, and is suitable for pumping processes.
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Figure BDA0005222805570000071
Abstract
Description
Technical Field
[0001] The invention relates to the field of concrete materials, in particular to a pumping foam concrete mixture and a preparation method thereof. Background Art
[0002] Since the density of foam concrete is lower than that of ordinary concrete, it can reduce the deadweight of buildings and foundation loads. In addition, foam concrete contains a large number of closed pores and has low thermal conductivity. Therefore, many high-rise buildings and large-span structures that need to have thermal insulation properties will use foam concrete as raw material for construction. However, since foam concrete contains a large number of bubbles, the bubbles are prone to mutual squeezing and friction during the pumping process, causing small bubbles to become large bubbles and large bubbles to burst, resulting in an uneven internal structure of the concrete and a large number of weak points. This will significantly reduce the strength of the concrete and make ordinary foam concrete mixtures difficult to apply to pumping construction processes. Therefore, there is still room for improvement. Summary of the invention
[0003] In order to improve the stability of bubbles in a pumped foam concrete mixture during the pumping process, the present application provides a pumped foam concrete mixture and a preparation method thereof.
[0004] In a first aspect, the present application provides a pumpable foam concrete mixture, which adopts the following technical solution: A pumpable foamed concrete mixture comprises the following components in parts by weight: 100 parts water; 320-330 parts of cement; 26-30 parts of fly ash; Aggregate 1120-1140 parts; 12-14 parts of composite foaming agent; 15-19 parts of composite foam stabilizer; 7-8 parts of additives; The composite foaming agent is a compound of sodium lauryl sulfate and sodium α-olefin sulfonate; The composite foam stabilizer is a compound of cyclohexyl methacrylate, octadecyl acrylate, 5-sodium sulfoisophthalate and octadecyl trimethyl ammonium chloride.
[0005] By adopting the above technical scheme, the composite foaming agent formed by compounding sodium dodecyl sulfate and sodium α-olefin sulfonate can produce uniform and dense fine foam during the stirring process, so that the foam in the mixture can be evenly distributed, and the composite foam stabilizer formed by compounding cyclohexyl methacrylate, octadecyl acrylate, sodium 5-sulfonate of isophthalic acid, and octadecyltrimethylammonium chloride can make the formed foam difficult to merge and break, so that the pumped foam concrete mixture can still maintain a structure with a large amount of fine foam evenly distributed inside after pumping construction, so that the strength of the solidified foam concrete is higher, and the quality of the foam concrete constructed by the pumping process is effectively improved.
[0006] Preferably, the mass ratio of the sodium dodecyl sulfate to the sodium α-olefin sulfonate is 6-7:6-7.
[0007] By adopting the above technical solution and specifically selecting the mass ratio of sodium dodecyl sulfate and sodium α-olefin sulfonate, the foaming effect in the mixing process is better, fine foam is generated more stably, and the strength of the concrete after curing is higher.
[0008] Preferably, the mass ratio of cyclohexyl methacrylate, octadecyl acrylate, sodium 5-sulfoisophthalic acid, and octadecyltrimethylammonium chloride is 1-2:4-5:3-4:7-8.
[0009] By adopting the above technical scheme and specifically selecting the mass ratio of cyclohexyl methacrylate, octadecyl acrylate, sodium 5-sulfonate of isophthalic acid and octadecyltrimethylammonium chloride, the effect of improving foam stability is better, so that the pumped foam concrete mixture is better suitable for the pumping process, and the obtained foamed concrete has better quality and better performance.
[0010] Preferably, the auxiliary agent is a compound of polycarboxylate water reducer and sodium gluconate.
[0011] By adopting the above technical solution and adding polycarboxylic acid water-reducing agent and sodium gluconate, the fluidity of foamed concrete is improved, the process difficulty during pumping is reduced, and the construction is easier.
[0012] Preferably, the mass ratio of the polycarboxylate water reducer to sodium gluconate is 3.5-4:3.5-4.
[0013] By adopting the above technical solution and specifically selecting the mass ratio of polycarboxylate water reducer and sodium gluconate, the effect of improving the fluidity of concrete is better and the quality of the pumped foam concrete mixture is better.
[0014] Preferably, the aggregate is a compound of fine aggregate and coarse aggregate.
[0015] By adopting the above technical solution and selecting the compound of fine aggregate and coarse aggregate, the cured concrete has higher strength and better performance.
[0016] Preferably, the mass ratio of the fine aggregate to the coarse aggregate is 440-450:680-690.
[0017] By adopting the above technical solution and specifically selecting the mass ratio of fine aggregate and coarse aggregate, the strength of the cured concrete is made higher.
[0018] In a second aspect, the present application provides a method for preparing a pumpable foamed concrete mixture, which adopts the following technical solution: A method for preparing the above-mentioned pumpable foamed concrete mixture comprises the following steps: Step 1), cement, fly ash, aggregate, composite foaming agent, composite foam stabilizer and additives are mixed uniformly to obtain a premix; Step 2), adding water to the premix, rotating speed 240-300r / min, stirring for 15-20min, and obtaining a pumpable foamed concrete mixture.
[0019] By adopting the above technical solution, the prepared pumped foam concrete mixture can still maintain stable and complete foam under the long-distance pumping process, so that the foam concrete constructed by the pumping process has higher strength and better quality.
[0020] In summary, this application has the following beneficial effects: 1. Since the composite foaming agent formed by compounding sodium dodecyl sulfate and sodium α-olefin sulfonate in the present application can produce uniform and dense fine foam during the stirring process, the foam in the mixture can be evenly distributed, and the composite foam stabilizer formed by compounding cyclohexyl methacrylate, octadecyl acrylate, sodium 5-sulfonate of isophthalic acid, and octadecyltrimethylammonium chloride can make the formed foam difficult to merge and break, so that the pumped foam concrete mixture can still maintain a structure with a large number of fine foams evenly distributed inside after pumping construction, so that the strength of the solidified foam concrete is higher, and the quality of the foam concrete constructed by the pumping process is effectively improved.
[0021] 2. In the present application, it is preferred to specifically select the mass ratio of sodium dodecyl sulfate and sodium α-olefin sulfonate so as to achieve a better foaming effect in the mixing process, to generate fine and stable foam, and to increase the strength of the concrete after curing.
[0022] 3. In the present application, it is preferred to specifically select the mass ratio of cyclohexyl methacrylate, octadecyl acrylate, sodium 5-sulfoisophthalate, and octadecyltrimethylammonium chloride to improve the foam stability, so that the pumped foam concrete mixture is better suitable for the pumping process, and the obtained foamed concrete has better quality and better performance. DETAILED DESCRIPTION
[0023] The present application is further described in detail below in conjunction with embodiments.
[0024] Example 1 A pumpable foamed concrete mixture comprises the following components: Water, cement, fly ash, aggregate, composite foaming agent, composite foam stabilizer, additives.
[0025] The cement is ordinary Portland cement purchased from Runfeng Cement, standard: PO 42.5R.
[0026] The fly ash was purchased from Lingshou County Yigao Mineral Products Processing Plant, first-grade fly ash.
[0027] Aggregate is a compound of fine aggregate and coarse aggregate.
[0028] The fine aggregate is river sand, purchased from Shijiazhuang Xinsheng Mineral Products Co., Ltd., 80 mesh.
[0029] The coarse aggregate is basalt crushed stone, purchased from Shijiazhuang Jingshi Mineral Products Co., Ltd., with a particle size of 18-22mm.
[0030] The composite foaming agent is a compound of sodium dodecyl sulfate and sodium α-olefin sulfonate; Sodium dodecyl sulfate is commercially available, CAS number: 151-21-3.
[0031] Sodium α-olefin sulfonate is commercially available, CAS number: 68439-57-6.
[0032] The composite foam stabilizer is a compound of cyclohexyl methacrylate, octadecyl acrylate, 5-sodium sulfonate of isophthalic acid and octadecyltrimethylammonium chloride.
[0033] Cyclohexyl methacrylate is commercially available, CAS number: 101-43-9.
[0034] Octadecanyl acrylate is commercially available, CAS number: 4813-57-4.
[0035] Sodium 5-sulfoisophthalate is commercially available, CAS number: 6362-79-4.
[0036] Octadecyltrimethylammonium chloride is commercially available, CAS number: 112-03-8.
[0037] The auxiliary agent is a compound of polycarboxylic acid water reducer and sodium gluconate.
[0038] The polycarboxylate water reducer was purchased from Jinan Quanchi New Materials Co., Ltd.
[0039] Sodium gluconate was purchased from Shaanxi Chenming Biotechnology Co., Ltd.
[0040] The preparation method of pumpable foam concrete mixture comprises the following steps: Step 1), 320kg cement, 26kg fly ash, 440kg fine aggregate, 680kg coarse aggregate, 6kg sodium dodecyl sulfate, 6kg sodium α-olefin sulfonate, 1kg cyclohexyl methacrylate, 4kg octadecyl acrylate, 3kg sodium 5-sulfonate of isophthalic acid, 7kg octadecyltrimethylammonium chloride, 3.5kg polycarboxylate water reducer, 3.5kg sodium gluconate are put into a mixer at a speed of 120r / min, stirred for 15min, mixed evenly, and a premix is obtained.
[0041] Step 2), add 100 kg of water to the premix, rotate at 240 r / min, stir for 15 min, and obtain a pumpable foam concrete mixture.
[0042] Example 2 A pumpable foamed concrete mixture comprises the following components: Water, cement, fly ash, aggregate, composite foaming agent, composite foam stabilizer, additives.
[0043] The cement is ordinary Portland cement purchased from Runfeng Cement, standard: PO 42.5R.
[0044] The fly ash was purchased from Lingshou County Yigao Mineral Products Processing Plant, first-grade fly ash.
[0045] Aggregate is a compound of fine aggregate and coarse aggregate.
[0046] The fine aggregate is river sand, purchased from Shijiazhuang Xinsheng Mineral Products Co., Ltd., 80 mesh.
[0047] The coarse aggregate is basalt crushed stone, purchased from Shijiazhuang Jingshi Mineral Products Co., Ltd., with a particle size of 18-22mm.
[0048] The composite foaming agent is a compound of sodium dodecyl sulfate and sodium α-olefin sulfonate; Sodium dodecyl sulfate is commercially available, CAS number: 151-21-3.
[0049] Sodium α-olefin sulfonate is commercially available, CAS number: 68439-57-6.
[0050] The composite foam stabilizer is a compound of cyclohexyl methacrylate, octadecyl acrylate, 5-sodium sulfonate of isophthalic acid and octadecyltrimethylammonium chloride.
[0051] Cyclohexyl methacrylate is commercially available, CAS number: 101-43-9.
[0052] Octadecanyl acrylate is commercially available, CAS number: 4813-57-4.
[0053] Sodium 5-sulfoisophthalate is commercially available, CAS number: 6362-79-4.
[0054] Octadecyltrimethylammonium chloride is commercially available, CAS number: 112-03-8.
[0055] The auxiliary agent is a compound of polycarboxylic acid water reducer and sodium gluconate.
[0056] The polycarboxylate water reducer was purchased from Jinan Quanchi New Materials Co., Ltd.
[0057] Sodium gluconate was purchased from Shaanxi Chenming Biotechnology Co., Ltd.
[0058] The preparation method of pumpable foam concrete mixture comprises the following steps: Step 1), 325kg cement, 28kg fly ash, 445kg fine aggregate, 685kg coarse aggregate, 6.5kg sodium dodecyl sulfate, 6.5kg sodium α-olefin sulfonate, 1.5kg cyclohexyl methacrylate, 4.5kg octadecyl acrylate, 3.5kg sodium 5-sulfonate of isophthalic acid, 7.5kg octadecyltrimethylammonium chloride, 3.75kg polycarboxylate water reducer, 3.75kg sodium gluconate are put into a mixer at a speed of 130r / min, stirred for 18min, and mixed evenly to obtain a premix.
[0059] Step 2), add 100 kg of water to the premix, rotate at 280 r / min, stir for 18 min, and obtain a pumpable foam concrete mixture.
[0060] Example 3 A pumpable foamed concrete mixture comprises the following components: Water, cement, fly ash, aggregate, composite foaming agent, composite foam stabilizer, additives.
[0061] The cement is ordinary Portland cement purchased from Runfeng Cement, standard: PO 42.5R.
[0062] The fly ash was purchased from Lingshou County Yigao Mineral Products Processing Plant, first-grade fly ash.
[0063] Aggregate is a compound of fine aggregate and coarse aggregate.
[0064] The fine aggregate is river sand, purchased from Shijiazhuang Xinsheng Mineral Products Co., Ltd., 80 mesh.
[0065] The coarse aggregate is basalt crushed stone, purchased from Shijiazhuang Jingshi Mineral Products Co., Ltd., with a particle size of 18-22mm.
[0066] The composite foaming agent is a compound of sodium dodecyl sulfate and sodium α-olefin sulfonate; Sodium dodecyl sulfate is commercially available, CAS number: 151-21-3.
[0067] Sodium α-olefin sulfonate is commercially available, CAS number: 68439-57-6.
[0068] The composite foam stabilizer is a compound of cyclohexyl methacrylate, octadecyl acrylate, 5-sodium sulfonate of isophthalic acid and octadecyltrimethylammonium chloride.
[0069] Cyclohexyl methacrylate is commercially available, CAS number: 101-43-9.
[0070] Octadecanyl acrylate is commercially available, CAS number: 4813-57-4.
[0071] Sodium 5-sulfoisophthalate is commercially available, CAS number: 6362-79-4.
[0072] Octadecyltrimethylammonium chloride is commercially available, CAS number: 112-03-8.
[0073] The auxiliary agent is a compound of polycarboxylic acid water reducer and sodium gluconate.
[0074] The polycarboxylate water reducer was purchased from Jinan Quanchi New Materials Co., Ltd.
[0075] Sodium gluconate was purchased from Shaanxi Chenming Biotechnology Co., Ltd.
[0076] The preparation method of pumpable foam concrete mixture comprises the following steps: Step 1), 330kg cement, 30kg fly ash, 450kg fine aggregate, 690kg coarse aggregate, 7kg sodium dodecyl sulfate, 7kg sodium α-olefin sulfonate, 2kg cyclohexyl methacrylate, 5kg octadecyl acrylate, 4kg sodium 5-sulfonate of isophthalic acid, 8kg octadecyltrimethylammonium chloride, 4kg polycarboxylate water reducer, 4kg sodium gluconate are put into a mixer at a speed of 120-140r / min, stirred for 20min, mixed evenly, and obtained a premix.
[0077] Step 2), add 100 kg of water to the premix, rotate at 300 r / min, stir for 20 min, and obtain a pumpable foam concrete mixture.
[0078] Comparative Example 1 A pumpable foamed concrete mixture, compared with Example 2, differs only in that: In the composite foam stabilizer, isobutyltriethoxysilane is used to replace cyclohexyl methacrylate in equal amounts.
[0079] Isobutyltriethoxysilane is commercially available, CAS number: 17980-47-1.
[0080] Comparative Example 2 A pumpable foamed concrete mixture, compared with Example 2, differs only in that: In the composite foam stabilizer, cocamidopropyl ammonium oxide is used to replace octadecyl acrylate in equal amounts.
[0081] Cocamidopropyl ammonium oxide is commercially available, CAS number: 68155-09-9.
[0082] Comparative Example 3 A pumpable foamed concrete mixture, compared with Example 2, differs only in that: In the composite foam stabilizer, coconut fatty acid diethanolamide is used to replace sodium 5-sulfonate of isophthalic acid in equal amounts.
[0083] Coconut fatty acid diethanolamide is commercially available, CAS number: 68603-42-9.
[0084] Comparative Example 4 A pumpable foamed concrete mixture, compared with Example 2, differs only in that: In the composite foam stabilizer, 1,2-decanediol is used to replace octadecyltrimethylammonium chloride in equal amounts.
[0085] 1,2-Decanediol is commercially available, CAS number: 1119-86-4.
[0086] Comparative Example 5 A pumpable foamed concrete mixture, compared with Example 2, differs only in that: In the composite foam stabilizer, isobutyl triethoxysilane is used to replace cyclohexyl methacrylate in an equal amount, cocamidopropyl ammonium oxide is used to replace octadecyl acrylate in an equal amount, coconut fatty acid diethanolamide is used to replace sodium 5-sulfonate of isophthalic acid in an equal amount, and 1,2-decanediol is used to replace octadecyl trimethyl ammonium chloride in an equal amount.
[0087] Isobutyltriethoxysilane is commercially available, CAS number: 17980-47-1.
[0088] Cocamidopropyl ammonium oxide is commercially available, CAS number: 68155-09-9.
[0089] Coconut fatty acid diethanolamide is commercially available, CAS number: 68603-42-9.
[0090] 1,2-Decanediol is commercially available, CAS number: 1119-86-4.
[0091] Experiment 1 According to GB / T50081-2019 "Standard for Test Methods for Physical and Mechanical Properties of Concrete", the 7-day compressive strength and 28-day compressive strength of the test samples made of the pumped foam concrete mixture in each embodiment and comparative example were tested.
[0092] Preparation of test samples: The pumped foam concrete mixture is pumped into a mold at a height of 200m from the ground through a pump station, watered and cured for 3 days, demolded, and left to stand and cure until the 7th and 28th days, and then tested respectively.
[0093] Experiment 2 The weight per cubic meter of the test sample made of the pumped foamed concrete mixture in each embodiment and comparative example was detected.
[0094] Preparation of test samples: The pumped foam concrete mixture is pumped into a mold at a height of 200m from the ground through a pump station, watered and cured for 3 days, demolded, and left to stand and cure until the 28th day, and then weighed.
[0095] The specific test data of Experiment 1-2 are shown in Table 1.
[0096] Table 1 According to the data comparison of each embodiment and the comparative example in Table 1, it can be obtained that the strength of each embodiment is significantly higher than that of each comparative example, and the weight per cubic meter of each embodiment is similar to and lower than that of each comparative example.
[0097] It can be seen that the weight per cubic meter of each embodiment and comparative example is at the normal level of lightweight concrete, but the strength of each comparative example is significantly reduced, proving that the foam structure in the mixed material of each comparative example is unstable after long-distance pumping, resulting in a large number of local weak points in the cured concrete, which leads to a significant decrease in the overall strength.
[0098] It is proved that when cyclohexyl methacrylate, octadecyl acrylate, sodium 5-sulfonate of isophthalic acid and octadecyltrimethylammonium chloride are compounded into a composite foam stabilizer, it can cooperate well with the foaming agent to make the foam very stable, thereby forming a uniformly distributed microporous structure, thereby making the strength of the concrete higher. It is proved that the pumped foam concrete mixture of each embodiment can be well applied to the pumping construction process, which significantly reduces the process difficulty of high-rise construction.
[0099] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.
Claims
1. A pumpable foamed concrete mixture, characterized in that: The composition includes the following components in parts by weight: 100 parts water; 320-330 parts of cement; 26-30 parts of fly ash; Aggregate 1120-1140 parts; 12-14 parts of composite foaming agent; 15-19 parts of composite foam stabilizer; 7-8 parts of additives; The composite foaming agent is a compound of sodium lauryl sulfate and sodium α-olefin sulfonate; The composite foam stabilizer is a compound of cyclohexyl methacrylate, octadecyl acrylate, 5-sodium sulfoisophthalate and octadecyl trimethyl ammonium chloride.
2. A pumpable foamed concrete mixture according to claim 1, characterized in that: The mass ratio of the sodium dodecyl sulfate to the sodium α-olefin sulfonate is 6-7:6-7.
3. A pumpable foamed concrete mixture according to claim 2, characterized in that: The mass ratio of the cyclohexyl methacrylate, octadecyl acrylate, sodium 5-sulfoisophthalic acid, and octadecyltrimethylammonium chloride is 1-2:4-5:3-4:7-8.
4. A pumpable foamed concrete mixture according to claim 1, characterized in that: The auxiliary agent is a compound of polycarboxylate water reducer and sodium gluconate.
5. A pumpable foamed concrete mixture according to claim 4, characterized in that: The mass ratio of the polycarboxylate water reducer to sodium gluconate is 3.5-4:3.5-4.
6. A pumpable foamed concrete mixture according to claim 1, characterized in that: The aggregate is a compound of fine aggregate and coarse aggregate.
7. A pumpable foamed concrete mixture according to claim 6, characterized in that: The mass ratio of the fine aggregate to the coarse aggregate is 440-450:680-690.
8. A method for preparing a pumpable foamed concrete mixture according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1), cement, fly ash, aggregate, composite foaming agent, composite foam stabilizer and additives are mixed evenly to obtain a premix; Step 2), add water to the premix, rotate at 240-300 r / min, stir for 15-20 min, and obtain a pumpable foam concrete mixture.