a rockfill concrete

Abstract

The invention discloses rock-fill concrete which comprises water, cement, gravel, sand, mineral powder, coal ash, a water reducing agent and stone. The rock-fill concrete comprises the following components in parts by weight: 160-200 parts of water, 250-540 parts of cement, 900-1000 parts of gravel, 790-870 parts of sand, 20-220 parts of mineral powder, 0-110 parts of coal ash and 1-10 parts of water reducing agent, wherein the volume of the stone accounts for 55-60 percent of total volume of the rock-fill concrete. According to the rock-fill concrete, the cement is equivalently replaced by using the mineral powder, high long-term strength can be obtained, the rock-fill concrete with excellent penetration resistance can be obtained, the durability of the rock-fill concrete is improved, the amount of the cement is reduced, the cost is saved, the secondary environmental pollution caused by the slag serving as the waste is avoided, the industrial wastes are effectively utilized, and the rock-fill concrete has high environmental benefits.

Description

Technical field [0001] The invention relates to a rockfill concrete, which belongs to the field of construction engineering. Background technique [0002] RockFilled Concrete (RFC for short) uses the high flow, anti-separation performance and self-flowing characteristics of self-compacting concrete (SCC). It can be used in large-sized blocks (in actual engineering, block stones can be used). (Diameter above 300mm) is randomly filled with self-compacting concrete to form a concrete rockfill body. [0003] The use of rockfill concrete for mass concrete pouring has the following main advantages: First, the construction speed is fast: Since the main process of rockfill concrete is rockfill warehousing and self-compacting concrete pouring, only a small amount of self-compacting concrete needs to be mixed. The process is simple, which can greatly increase the construction speed; second, the construction quality is easy to guarantee: Because the rockfill concrete does not have the vibrat...

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used admixture of self-compacting concrete for pouring rockfill concrete is fly ash. Fly ash can improve the fluidity of the mixture, but its 28d activity index is relatively low, resulting in low strength in the later stage. Cement can obtain higher late strength

[0005] At the same time, the amount of cement in rockfill concrete is still too large, the hydration reaction is violent, the hydration heat release is large, the drying shrinkage, and temperature shrinkage are strong, and the resulting tensile stress is enough to cause concrete cracking. Once the concrete structure appears cracks, which will intensify freeze-thaw, chemical erosion and alkali-aggregate reaction, and the reduction of durability is inevitable, seriously endangering the safety of the dam

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