Mix proportion of anti-disengaging self-compacting concrete for tunnel secondary lining vault

Abstract

The invention relates to the technical field of concrete mix proportion, in particular to a tunnel secondary lining vault anti-disengaging self-compacting concrete mix proportion, which comprises the following components: a cementing material system: ordinary Portland cement, I-grade fly ash and an expanding agent; the total mass of the cementing material is the sum of the mass of the ordinary Portland cement, the fly ash and the expanding agent; the aggregate system is river sand; the double-particle-size grading coarse aggregate comprises crushed stones with the particle size of 5-10 mm and crushed stones with the particle size of 10-20 mm; the admixture comprises a polycarboxylic acid high-performance water reducing agent and an air entraining agent, and the air entraining agent is a compound combination of a triterpenoid saponin air entraining agent and a liquid air entraining agent; the water-binder ratio is 0.3-0.4, and the total water consumption is 175-180kg / m < By optimizing the synergistic effect of the cementing material, the aggregate gradation and the additive, the effects of vibration-free construction, high fluidity and zero void are achieved. The mix proportion significantly reduces the construction cost, improves the compactness and durability, and is suitable for efficient construction of tunnel vaults.

Images