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A platform for research: civil engineering, architecture and urbanism
Low-shrinkage high-strength self-compacting recycled concrete and preparation method thereof
The invention discloses low-shrinkage high-strength self-compacting recycled concrete and a preparation method thereof. The low-shrinkage high-strength self-compaction recycled concrete is prepared from the following raw materials: cement, natural coarse aggregate, recycled coarse aggregate, fine aggregate, recycled fine aggregate, water, coal ash, mineral powder, superfine stone powder, a polycarboxylic acid high-efficiency water reducing agent, a composite expanding agent and an air entraining agent in a mass ratio of 1: (1.21-2.3): (0.41-1.35): (2.13-2.43): (0.54-0.91): (0.49-0.55): (0.31-0.35): (0.156-0.175): 0.088: (0.0234-0.0263): (0.094-0.105): 0.0003. According to the invention, a cement-fly ash-mineral powder-superfine stone powder quaternary composite system is used as a cementing material, the recycled aggregate saturated by water absorption is used as an internal curing material, the materials cooperate with the composite expanding agent to compensate shrinkage, and meanwhile, the air entraining agent is added, so that the obtained self-compacting recycled concrete has excellent filling property, gap passing property and segregation resistance; meanwhile, the strength is high, the shrinkage is low, and the excellent chloride ion permeability resistance and freezing resistance are achieved.
本发明公开了一种低收缩高强自密实再生混凝土及其制备方法，配制该低收缩高强自密实再生混凝土所用的各原材料的质量比为水泥∶天然粗骨料∶再生粗骨料∶细骨料∶再生细骨料∶水∶粉煤灰∶矿粉∶超细石粉∶聚羧酸高效减水剂∶复合型膨胀剂：引气剂＝1∶(1.21～2.3)∶(0.41～1.35)∶(2.13～2.43)∶(0.54～0.91)∶(0.49～0.55)∶(0.31～0.35)∶(0.156～0.175)∶0.088∶(0.0234～0.0263)∶(0.094～0.105)∶0.0003。本发明以水泥‑粉煤灰‑矿粉‑超细石粉四元复合体系为胶凝材料，以吸水饱和的再生骨料作为内养护材料，与复合型膨胀剂协同作用补偿收缩，同时加入引气剂，使得所得自密实再生混凝土具有优异的填充性、间隙通过性、抗离析性，同时强度较高，收缩低，具有优异的抗氯离子渗透性以及抗冻性。
Low-shrinkage high-strength self-compacting recycled concrete and preparation method thereof
The invention discloses low-shrinkage high-strength self-compacting recycled concrete and a preparation method thereof. The low-shrinkage high-strength self-compaction recycled concrete is prepared from the following raw materials: cement, natural coarse aggregate, recycled coarse aggregate, fine aggregate, recycled fine aggregate, water, coal ash, mineral powder, superfine stone powder, a polycarboxylic acid high-efficiency water reducing agent, a composite expanding agent and an air entraining agent in a mass ratio of 1: (1.21-2.3): (0.41-1.35): (2.13-2.43): (0.54-0.91): (0.49-0.55): (0.31-0.35): (0.156-0.175): 0.088: (0.0234-0.0263): (0.094-0.105): 0.0003. According to the invention, a cement-fly ash-mineral powder-superfine stone powder quaternary composite system is used as a cementing material, the recycled aggregate saturated by water absorption is used as an internal curing material, the materials cooperate with the composite expanding agent to compensate shrinkage, and meanwhile, the air entraining agent is added, so that the obtained self-compacting recycled concrete has excellent filling property, gap passing property and segregation resistance; meanwhile, the strength is high, the shrinkage is low, and the excellent chloride ion permeability resistance and freezing resistance are achieved.
本发明公开了一种低收缩高强自密实再生混凝土及其制备方法，配制该低收缩高强自密实再生混凝土所用的各原材料的质量比为水泥∶天然粗骨料∶再生粗骨料∶细骨料∶再生细骨料∶水∶粉煤灰∶矿粉∶超细石粉∶聚羧酸高效减水剂∶复合型膨胀剂：引气剂＝1∶(1.21～2.3)∶(0.41～1.35)∶(2.13～2.43)∶(0.54～0.91)∶(0.49～0.55)∶(0.31～0.35)∶(0.156～0.175)∶0.088∶(0.0234～0.0263)∶(0.094～0.105)∶0.0003。本发明以水泥‑粉煤灰‑矿粉‑超细石粉四元复合体系为胶凝材料，以吸水饱和的再生骨料作为内养护材料，与复合型膨胀剂协同作用补偿收缩，同时加入引气剂，使得所得自密实再生混凝土具有优异的填充性、间隙通过性、抗离析性，同时强度较高，收缩低，具有优异的抗氯离子渗透性以及抗冻性。
Low-shrinkage high-strength self-compacting recycled concrete and preparation method thereof
一种低收缩高强自密实再生混凝土及其制备方法
CHEN XUYONG (author) / ZHOU QI (author) / CHENG SHUKAI (author) / SEO WOONG (author) / WU QIAOYUN (author)
2022-09-20
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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