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Machine-made sand self-compacting concrete and preparation method thereof
The invention discloses machine-made sand self-compacting concrete and a preparation method thereof, belonging to the technical field of concrete. The concrete is obtained by mixing the following rawmaterials: 300-350 parts of cement, 60-90 parts of fly ash, 100-130 parts of mineral powder, 870-920 parts of machine-made sand with a fineness of 3.1-3.5, 250-350 parts of continuously-graded naturalgravel with a size in a range of 5-16 mm, 650-750 parts of continuously-graded natural gravel with a size in a range of 5-20 mm, 190-220 parts of water and 11.0-12.5 parts of a polycarboxylate superplasticizer. The machine-made sand is subjected to the following modification treatment before use: adding a filler composition containing diatomite and talcum powder in a weight ratio of 1: (0.12-0.2)into an aqueous polyvinyl alcohol solution to make the concentration of the filler composition to be 100-150 g/L, thereby obtaining a modified solution A; adding a fiber composition containing basaltfibers and brucite fibers in a weight ratio of 1: (0.15-0.22) into another aqueous polyvinyl alcohol solution to make the concentration of the filler composition to be 50-100g/L, thereby obtaining amodified solution B; and soaking and stirring machine-made sand raw materials in the modification liquid A for 1-2 hours, soaking and stirring the machine-made sand raw materials in the modification liquid B for 1-2 hours, and carrying out drying to obtain the machine-made sand. The concrete still has better fluidity and strength on the premise of completely adopting machine-made sand as sand.
本发明公开了一种机制砂自密实混凝土及其制备方法，属于混凝土的技术领域。该混凝土由包括以下组分的原料混合获得：水泥300‑350份、粉煤灰60‑90份、矿粉100‑130份、细度为3.1‑3.5的机制砂870‑920份、5‑16mm连续级配的天然碎石250‑350份、5‑20mm连续级配的天然碎石650‑750份、水190‑220份、聚羧酸减水剂11.0‑12.5份；上述机制砂在使用前经过改性处理：按100‑150g/L向聚乙烯醇水溶液中添加包含重量比为1:（0.12‑0.2）的硅藻土和滑石粉的填料组合物，得改性液A；按50‑100g/L向聚乙烯醇水溶液中添加包含重量比为1:（0.15‑0.22）的玄武岩纤维和水镁石纤维的纤维组合物，得改性液B；机制砂原料于改性液A中浸泡搅拌1‑2h，于改性液B中浸泡搅拌1‑2h，烘干，即得。该混凝土在全部采用机制砂作为砂的前提下仍具较佳的流动度和强度。
Machine-made sand self-compacting concrete and preparation method thereof
The invention discloses machine-made sand self-compacting concrete and a preparation method thereof, belonging to the technical field of concrete. The concrete is obtained by mixing the following rawmaterials: 300-350 parts of cement, 60-90 parts of fly ash, 100-130 parts of mineral powder, 870-920 parts of machine-made sand with a fineness of 3.1-3.5, 250-350 parts of continuously-graded naturalgravel with a size in a range of 5-16 mm, 650-750 parts of continuously-graded natural gravel with a size in a range of 5-20 mm, 190-220 parts of water and 11.0-12.5 parts of a polycarboxylate superplasticizer. The machine-made sand is subjected to the following modification treatment before use: adding a filler composition containing diatomite and talcum powder in a weight ratio of 1: (0.12-0.2)into an aqueous polyvinyl alcohol solution to make the concentration of the filler composition to be 100-150 g/L, thereby obtaining a modified solution A; adding a fiber composition containing basaltfibers and brucite fibers in a weight ratio of 1: (0.15-0.22) into another aqueous polyvinyl alcohol solution to make the concentration of the filler composition to be 50-100g/L, thereby obtaining amodified solution B; and soaking and stirring machine-made sand raw materials in the modification liquid A for 1-2 hours, soaking and stirring the machine-made sand raw materials in the modification liquid B for 1-2 hours, and carrying out drying to obtain the machine-made sand. The concrete still has better fluidity and strength on the premise of completely adopting machine-made sand as sand.
本发明公开了一种机制砂自密实混凝土及其制备方法，属于混凝土的技术领域。该混凝土由包括以下组分的原料混合获得：水泥300‑350份、粉煤灰60‑90份、矿粉100‑130份、细度为3.1‑3.5的机制砂870‑920份、5‑16mm连续级配的天然碎石250‑350份、5‑20mm连续级配的天然碎石650‑750份、水190‑220份、聚羧酸减水剂11.0‑12.5份；上述机制砂在使用前经过改性处理：按100‑150g/L向聚乙烯醇水溶液中添加包含重量比为1:（0.12‑0.2）的硅藻土和滑石粉的填料组合物，得改性液A；按50‑100g/L向聚乙烯醇水溶液中添加包含重量比为1:（0.15‑0.22）的玄武岩纤维和水镁石纤维的纤维组合物，得改性液B；机制砂原料于改性液A中浸泡搅拌1‑2h，于改性液B中浸泡搅拌1‑2h，烘干，即得。该混凝土在全部采用机制砂作为砂的前提下仍具较佳的流动度和强度。
Machine-made sand self-compacting concrete and preparation method thereof
一种机制砂自密实混凝土及其制备方法
WU JIANPING (author) / LIU ZHENYI (author)
2020-05-22
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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