A pumped ceramsite concrete mixture and its preparation process
By alkalizing and modifying the ceratops, hydrophobic modified ceratops are prepared, which solves the problem of reduced fluidity of the ceratops concrete during pumping, and achieves high flowability and high strength of the concrete.
Patent Information
- Application Number
- CN202411987934.9
- 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
Ceramic concrete easily absorbs moisture during the pumping process, resulting in a decrease in fluidity and increasing the difficulty of pumping.
By alkalizing the ceratops in the alkaline liquid and modifying them in the modified liquid, modified clays with hydrophobicity are prepared to reduce moisture absorption and maintain the flowability of the concrete.
Modified ceratops allow the concrete mixing material to maintain high fluidity during the pumping process and increase the strength of the concrete after curing, which is suitable for high-strength projects.
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Abstract
Description
Technical Field
[0001] The invention relates to the field of concrete materials, in particular to a pumping ceramsite concrete mixture and a preparation process thereof. Background Art
[0002] Since the density of expanded clay concrete is lower than that of ordinary concrete, it can reduce the deadweight of buildings and reduce foundation loads. Therefore, many high-rise buildings and large-span structures are built with expanded clay concrete as raw material. However, due to its lightweight and porous structure, expanded clay has high water absorption. Therefore, during the pumping process, expanded clay easily absorbs moisture in the concrete, making the fluidity of the concrete lower and increasing the difficulty of pumping. Therefore, there is still room for improvement. Summary of the invention
[0003] In order to enable a pumped ceramsite concrete mixture to better and longer maintain high fluidity, the present application provides a pumped ceramsite concrete mixture and a preparation process thereof.
[0004] In the first aspect, the present application provides a pumpable ceramsite concrete mixture, which adopts the following technical solution: A pumpable ceramsite concrete mixture comprises the following components in parts by mass: 100 parts water; 320-330 parts of cement; 26-30 parts of fly ash; 660-670 parts of modified ceramsite; Aggregate 460-470 parts; 6-7 parts of additives; The modification method of the modified ceramsite is as follows: Step 1), soaking the ceramsite in an alkali solution for modification to obtain alkalized ceramsite; Step 2), putting the alkalized ceramsite into the modification liquid, soaking and modifying, and obtaining the modified ceramsite; The modified liquid is a compound of diethylene glycol diacrylate, glycidol and bis(acetylacetonato)ethoxyisopropoxytitanate.
[0005] By adopting the above technical scheme, alkalizing the ceramsite with alkali solution and modifying the alkalized ceramsite with a modifying liquid prepared by compounding diethylene glycol diacrylate, glycidol, and bis(acetylacetonato)ethoxyisopropoxytitanate, the prepared modified ceramsite has strong hydrophobicity, so that water is not easily absorbed by the ceramsite, thereby well maintaining the fluidity of the concrete mixture, making the concrete mixture better suitable for pumping technology, and the modified ceramsite and cement slurry can form a tighter bite structure, so that the strength of the concrete mixture after curing is higher, the quality of the concrete is better, and it is better used in various high-strength projects.
[0006] Preferably, in the modified liquid, the mass ratio of diethylene glycol diacrylate, glycidol, and bis(acetylacetonato)ethoxyisopropoxytitanate is 15-17:60-62:6-8.
[0007] By adopting the above technical scheme and specifically selecting the mass ratio of diethylene glycol diacrylate, glycidol and bis(acetylacetonato)ethoxyisopropoxytitanate, the modification effect on ceramsite is better and the strength of concrete is better improved.
[0008] Preferably, in step 1), the alkali solution is a mixture of sodium hydroxide, potassium hydroxide and water.
[0009] By adopting the above technical scheme and selecting the compound of sodium hydroxide and potassium hydroxide, the alkali solution has a better alkalization modification effect on ceramsite, so that the alkalized ceramsite can be better modified in the modifying solution, the quality of the modified ceramsite is better, and the effect of maintaining the fluidity of the concrete mixture and improving the strength of the concrete is better.
[0010] Preferably, in the alkali solution, the mass ratio of sodium hydroxide, potassium hydroxide and water is 1-2:1-2:4-5.
[0011] By adopting the above technical solution and specifically selecting the mass ratio of sodium hydroxide and potassium hydroxide, the alkalization modification effect is better and the quality of the prepared concrete mixture is higher.
[0012] Preferably, in the step 1), after the ceramsite is put into the alkali solution, the temperature is kept at 60-70° C. and soaked for 2-3 hours to obtain the alkalized ceramsite.
[0013] By adopting the above technical solution and specifically selecting 60-70°C for alkalization modification, the alkalization modification effect is better, and the performance of the modified ceramsite is further improved, thereby better improving the performance of concrete.
[0014] Preferably, in the step 2), after the alkalized ceramsite is put into the modification liquid, the temperature is kept at 30-35° C. and the ceramsite is soaked for modification for 12-14 hours to obtain the modified ceramsite.
[0015] By adopting the above technical solution and specifically selecting 30-35°C for modification, the modification effect is better, the hydrophobicity of the expanded clay is better, the fluidity of the concrete mixture is better maintained, and the difficulty of pumping is reduced.
[0016] Preferably, the auxiliary agent is a compound of polycarboxylate water reducer and sodium gluconate.
[0017] By adopting the above technical solution and specifically selecting polycarboxylate water reducer and sodium gluconate, the concrete mixture can better maintain high fluidity for a long time and is more suitable for pumping technology.
[0018] Preferably, the mass ratio of the polycarboxylate water reducer to sodium gluconate is 3-3.5:3-3.5.
[0019] By adopting the above technical scheme and specifically selecting the mass ratio of polycarboxylate water-reducing agent and sodium gluconate, the water-reducing and retarding effects are better, and the process performance of the concrete mixture is better.
[0020] In a second aspect, the present application provides a method for preparing a pumped ceramsite concrete mixture, using the following technical solution: A preparation process of the above-mentioned pumpable ceramsite concrete mixture comprises the following steps: Step 01), cement, fly ash, modified cementite and aggregate are mixed evenly to obtain a premix; Step 02), add water and additives to the premix, mix evenly, and obtain a pumpable ceramsite concrete mixture.
[0021] By adopting the above technical scheme, the prepared concrete mixture has good fluidity and the fluidity can be maintained for a long time, which is very suitable for pumping technology. In addition, the concrete material formed after the concrete mixture is solidified has high strength, which can well meet the needs of high-strength engineering and has broad application prospects.
[0022] In summary, this application has the following beneficial effects: 1. Since the present application uses alkalizing ceramsite with alkali solution and modifies the alkalized ceramsite with a modifying liquid compounded with diethylene glycol diacrylate, glycidol, and bis(acetylacetonato)ethoxyisopropoxytitanate, the obtained modified ceramsite has strong hydrophobicity, making it difficult for water to be absorbed by the ceramsite, thereby well maintaining the fluidity of the concrete mixture, making the concrete mixture better suitable for pumping technology, and the modified ceramsite and cement slurry can form a tighter bite structure, so that the strength of the concrete mixture after curing is higher, the quality of the concrete is better, and it is better used in various high-strength projects.
[0023] 2. In the present application, it is preferred to specifically select the mass ratio of diethylene glycol diacrylate, glycidol, and bis(acetylacetonato)ethoxyisopropoxytitanate so as to achieve a better modification effect on ceramsite and better improve the strength of concrete.
[0024] 3. In the present application, it is preferred to select a compound of sodium hydroxide and potassium hydroxide so that the alkali solution has a better alkalization modification effect on the ceramsite, so that the alkalized ceramsite can be better modified in the modifying solution, the quality of the modified ceramsite is better, and the effect of maintaining the fluidity of the concrete mixture and improving the strength of the concrete is better. DETAILED DESCRIPTION
[0025] The present application is further described in detail below in conjunction with embodiments.
[0026] Example 1 A pumpable ceramsite concrete mixture comprises the following components: Water, cement, fly ash, modified ceramsite, aggregate, additives.
[0027] The cement is ordinary Portland cement purchased from Runfeng Cement, standard: PO 42.5R.
[0028] The fly ash was purchased from Lingshou County Yigao Mineral Products Processing Plant, first-grade fly ash.
[0029] The aggregate is river sand, purchased from Shijiazhuang Xinsheng Mineral Products Co., Ltd., 80 mesh.
[0030] The auxiliary agent is a compound of polycarboxylic acid water reducer and sodium gluconate.
[0031] The polycarboxylate water reducer was purchased from Jinan Quanchi New Materials Co., Ltd.
[0032] Sodium gluconate was purchased from Shaanxi Chenming Biotechnology Co., Ltd.
[0033] The modified ceramsite is homemade, and the modification method of the modified ceramsite is as follows: Step 1), 100kg of sodium hydroxide, 100kg of potassium hydroxide and 500kg of water are mixed to prepare alkali solution, and then 700kg of ceramsite is put into the alkali solution at a constant temperature of 60°C, soaked for 2h, solids are filtered out, and then washed with clean water until the pH value of the washing water is ≤8, and then dried to obtain alkalized ceramsite.
[0034] Step 2), 150kg of diethylene glycol diacrylate, 600kg of glycidol, and 60kg of di(acetylacetonato)ethoxyisopropoxytitanate are mixed to prepare a modified liquid, and then the alkalized ceramsite is put into the modified liquid, kept at a constant temperature of 30°C, soaked for 12h, filtered, and dried to obtain modified ceramsite.
[0035] The expanded clay was purchased from Chongqing Shengguan Expanded Clay Building Materials Co., Ltd. with a particle size of 20-22 mm.
[0036] Sodium hydroxide is commercially available, CAS number: 1310-73-2.
[0037] Potassium hydroxide is commercially available, CAS number: 1310-58-3.
[0038] Diethylene glycol diacrylate was purchased from Hubei Xinghengye Technology Co., Ltd., CAS No.: 4074-88-8.
[0039] Glycidol was purchased from Shandong Guangpu Biotechnology Co., Ltd., CAS No.: 556-52-5.
[0040] Bis(acetylacetonato)ethoxyisopropoxytitanate was purchased from Hubei Tosoh Chemical Technology Co., Ltd., CAS No.: 445398-76-5.
[0041] The preparation process of pumped ceramsite concrete mixture includes the following steps: Step 01), put 320kg cement, 26kg fly ash, 660kg modified ceramsite and 460kg aggregate into a stirring tank, rotate at 90r / min, stir for 15min, mix evenly, and obtain a premix.
[0042] Step 02), add 100kg water, 3kg polycarboxylate water reducer, and 3kg sodium gluconate to the premix, rotate at 90r / min, stir for 5min, mix evenly, and obtain a pumpable ceramsite concrete mixture.
[0043] Example 2 A pumpable ceramsite concrete mixture comprises the following components: Water, cement, fly ash, modified ceramsite, aggregate, additives.
[0044] The cement is ordinary Portland cement purchased from Runfeng Cement, standard: PO 42.5R.
[0045] The fly ash was purchased from Lingshou County Yigao Mineral Products Processing Plant, first-grade fly ash.
[0046] The aggregate is river sand, purchased from Shijiazhuang Xinsheng Mineral Products Co., Ltd., 80 mesh.
[0047] The auxiliary agent is a compound of polycarboxylic acid water reducer and sodium gluconate.
[0048] The polycarboxylate water reducer was purchased from Jinan Quanchi New Materials Co., Ltd.
[0049] Sodium gluconate was purchased from Shaanxi Chenming Biotechnology Co., Ltd.
[0050] The modified ceramsite is homemade, and the modification method of the modified ceramsite is as follows: Step 1), 150kg of sodium hydroxide, 150kg of potassium hydroxide and 450kg of water are mixed to prepare alkali solution, and then 700kg of ceramsite is put into the alkali solution at a constant temperature of 65°C, soaked for 2.5 hours, solids are filtered out, and then washed with clean water until the pH value of the washing water is ≤8, and then dried to obtain alkalized ceramsite.
[0051] Step 2), 160kg of diethylene glycol diacrylate, 610kg of glycidol, and 70kg of di(acetylacetonato)ethoxyisopropoxytitanate are mixed to prepare a modified liquid, and then the alkalized ceramsite is put into the modified liquid, kept at a constant temperature of 33°C, soaked for 13h, filtered, and dried to obtain the modified ceramsite.
[0052] The expanded clay was purchased from Chongqing Shengguan Expanded Clay Building Materials Co., Ltd. with a particle size of 20-22 mm.
[0053] Sodium hydroxide is commercially available, CAS number: 1310-73-2.
[0054] Potassium hydroxide is commercially available, CAS number: 1310-58-3.
[0055] Diethylene glycol diacrylate was purchased from Hubei Xinghengye Technology Co., Ltd., CAS No.: 4074-88-8.
[0056] Glycidol was purchased from Shandong Guangpu Biotechnology Co., Ltd., CAS No.: 556-52-5.
[0057] Bis(acetylacetonato)ethoxyisopropoxytitanate was purchased from Hubei Tosoh Chemical Technology Co., Ltd., CAS No.: 445398-76-5.
[0058] The preparation process of pumped ceramsite concrete mixture includes the following steps: Step 01), put 325kg cement, 28kg fly ash, 665kg modified ceramsite and 465kg aggregate into a stirring kettle, rotate at 90r / min, stir for 18min, mix evenly, and obtain a premix.
[0059] Step 02), add 100kg water, 3.3kg polycarboxylate water reducer, and 3.3kg sodium gluconate to the premix, rotate at 90r / min, stir for 8min, mix evenly, and obtain a pumpable ceramsite concrete mixture.
[0060] Example 3 A pumpable ceramsite concrete mixture comprises the following components: Water, cement, fly ash, modified ceramsite, aggregate, 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] The aggregate is river sand, purchased from Shijiazhuang Xinsheng Mineral Products Co., Ltd., 80 mesh.
[0064] The auxiliary agent is a compound of polycarboxylic acid water reducer and sodium gluconate.
[0065] The polycarboxylate water reducer was purchased from Jinan Quanchi New Materials Co., Ltd.
[0066] Sodium gluconate was purchased from Shaanxi Chenming Biotechnology Co., Ltd.
[0067] The modified ceramsite is homemade, and the modification method of the modified ceramsite is as follows: Step 1), 200kg of sodium hydroxide, 200kg of potassium hydroxide and 400kg of water are mixed to prepare alkali solution, and then 700kg of ceramsite is put into the alkali solution at a constant temperature of 70°C, soaked for 3 hours, solids are filtered out, and then washed with clean water until the pH value of the washing water is ≤8, and then dried to obtain alkalized ceramsite.
[0068] Step 2), 170kg of diethylene glycol diacrylate, 620kg of glycidol, and 80kg of di(acetylacetonato)ethoxyisopropoxytitanate are mixed to prepare a modified liquid, and then the alkalized ceramsite is put into the modified liquid, kept at a constant temperature of 35°C, soaked for 14 hours, filtered, and dried to obtain the modified ceramsite.
[0069] The expanded clay was purchased from Chongqing Shengguan Expanded Clay Building Materials Co., Ltd. with a particle size of 20-22 mm.
[0070] Sodium hydroxide is commercially available, CAS number: 1310-73-2.
[0071] Potassium hydroxide is commercially available, CAS number: 1310-58-3.
[0072] Diethylene glycol diacrylate was purchased from Hubei Xinghengye Technology Co., Ltd., CAS No.: 4074-88-8.
[0073] Glycidol was purchased from Shandong Guangpu Biotechnology Co., Ltd., CAS No.: 556-52-5.
[0074] Bis(acetylacetonato)ethoxyisopropoxytitanate was purchased from Hubei Tosoh Chemical Technology Co., Ltd., CAS No.: 445398-76-5.
[0075] The preparation process of pumped ceramsite concrete mixture includes the following steps: Step 01), put 330kg cement, 30kg fly ash, 670kg modified ceramsite and 470kg aggregate into a stirring tank, rotate at 90r / min, stir for 20min, mix evenly, and obtain a premix.
[0076] Step 02), add 100kg water, 3.5kg polycarboxylate water reducer, and 3.5kg sodium gluconate to the premix, rotate at 90r / min, stir for 10min, mix evenly, and obtain a pumpable ceramsite concrete mixture.
[0077] Comparative Example 1 A pumpable ceramsite concrete mixture, compared with Example 2, differs only in that: The modified ceramsite is homemade, and the modification method of the modified ceramsite is as follows: Step 1), 160kg of diethylene glycol diacrylate, 610kg of glycidol, and 70kg of bis(acetylacetonato)ethoxyisopropoxytitanate are mixed to prepare a modified liquid, and then 700kg of ceramsite is put into the modified liquid, kept at a constant temperature of 33°C, soaked for 13h, filtered, and dried to obtain modified ceramsite.
[0078] Comparative Example 2 A pumpable ceramsite concrete mixture, compared with Example 2, differs only in that: In the modified liquid, hydroxypropyl methacrylate was used to replace diethylene glycol diacrylate in equal amounts.
[0079] Hydroxypropyl methacrylate was purchased from Shandong Juchangyuan Chemical Co., Ltd.
[0080] Comparative Example 3 A pumpable ceramsite concrete mixture, compared with Example 2, differs only in that: In the modification solution, ethyl acetate was used to replace glycidol in equal amounts.
[0081] Ethyl acetate was purchased from Shanghai Hongzhuang Chemical Technology Co., Ltd.
[0082] Comparative Example 4 A pumpable ceramsite concrete mixture, compared with Example 2, differs only in that: In the modified solution, hexadecyltrimethoxysilane is used in equal amounts to replace bis(acetylacetonato)ethoxyisopropoxytitanate.
[0083] Hexadecyltrimethoxysilane was purchased from Nanjing Quanxi New Materials Co., Ltd.
[0084] Comparative Example 5 A pumpable ceramsite concrete mixture, compared with Example 2, differs only in that: In the modified liquid, hydroxypropyl methacrylate was used to replace diethylene glycol diacrylate in an equal amount, ethyl acetate was used to replace glycidol in an equal amount, and hexadecyltrimethoxysilane was used to replace bis(acetylacetonato)ethoxyisopropoxytitanate in an equal amount.
[0085] Hydroxypropyl methacrylate was purchased from Shandong Juchangyuan Chemical Co., Ltd.
[0086] Ethyl acetate was purchased from Shanghai Hongzhuang Chemical Technology Co., Ltd.
[0087] Hexadecyltrimethoxysilane was purchased from Nanjing Quanxi New Materials Co., Ltd.
[0088] 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 ceramsite concrete mixture in each embodiment and comparative example were tested.
[0089] Preparation of test samples: The pumped expanded clay concrete mixture was injected into the mold, watered and cured for 3 days, demolded, and allowed to stand and cure until the 7th and 28th days, and then tested respectively.
[0090] Experiment 2 According to GBT50080-2016 "Standard for Experimental Methods for Performance of Ordinary Concrete Mixtures", the slump and slump loss over time of the pumped ceramsite concrete mixtures prepared in each embodiment and comparative example were tested.
[0091] The specific experimental data of Experiment 1-2 are shown in Table 1.
[0092] Table 1 According to the data comparison of each embodiment and comparative example in Table 1, it can be obtained that the compressive strength of each embodiment is significantly higher than that of each comparative example, the slump of each embodiment is significantly higher than that of each comparative example, and the slump loss over time of each embodiment is significantly lower than that of each comparative example.
[0093] It can be seen that when the expanded clay is alkalized with alkali solution and then modified with a modifying liquid prepared by compounding diethylene glycol diacrylate, glycidol, and bis(acetylacetonato)ethoxyisopropoxytitanate, the pumpable expanded clay concrete mixture obtained by replacing the coarse aggregate with the modified expanded clay can maintain a high fluidity for a long time, and is very suitable for the pumping process. At the same time, after the concrete mixture is solidified, the strength of the concrete material can be improved, making the quality of the concrete material higher.
[0094] 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. However, as long as it is within the scope of the claims of the present application, it shall be protected by the patent law.
Claims
1. A pumpable ceramsite 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; 660-670 parts of modified ceramsite; Aggregate 460-470 parts; 6-7 parts of additives; The modification method of the modified ceramsite is as follows: Step 1), soaking the ceramsite in an alkali solution for modification to obtain alkalized ceramsite; Step 2), putting the alkalized ceramsite into the modification liquid, soaking and modifying, and obtaining the modified ceramsite; The modified liquid is a compound of diethylene glycol diacrylate, glycidol and bis(acetylacetonato)ethoxyisopropoxytitanate.
2. A pumpable ceramsite concrete mixture according to claim 1, characterized in that: In the modified liquid, the mass ratio of diethylene glycol diacrylate, glycidol, and bis(acetylacetonato)ethoxyisopropoxytitanate is 15-17:60-62:6-8.
3. A pumpable ceramsite concrete mixture according to claim 2, characterized in that: In the step 1), the alkali solution is a mixture of sodium hydroxide, potassium hydroxide and water.
4. A pumpable ceramsite concrete mixture according to claim 3, characterized in that: In the alkali solution, the mass ratio of sodium hydroxide, potassium hydroxide and water is 1-2:1-2:4-5.
5. The pumpable ceramsite concrete mixture according to claim 1, characterized in that: In the step 1), after the ceramsite is put into the alkali solution, the temperature is kept at 60-70° C. and soaked for 2-3 hours to obtain the alkalized ceramsite.
6. The pumpable ceramsite concrete mixture according to claim 1, characterized in that: In the step 2), after the alkalized ceramsite is put into the modification liquid, the temperature is kept at 30-35° C. and the modified ceramsite is soaked for 12-14 hours to obtain the modified ceramsite.
7. The pumpable ceramsite concrete mixture according to claim 1, characterized in that: The auxiliary agent is a compound of polycarboxylate water reducer and sodium gluconate.
8. A pumpable ceramsite concrete mixture according to claim 7, characterized in that: The mass ratio of the polycarboxylate water reducer to sodium gluconate is 3-3.5:3-3.
5.
9. A process for preparing a pumpable ceramsite concrete mixture according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 01), cement, fly ash, modified cementite and aggregate are mixed evenly to obtain a premix; Step 02), add water and additives to the premix, mix evenly, and obtain a pumpable ceramsite concrete mixture.