Self-leveling and low self-shrinkage ultra-high performance concrete composition

Abstract

The invention relates to a self-leveling and low self-shrinkage ultra-high performance concrete composition, the raw material components of which include powder materials, quartz sand and water reducers; The materials include: 20-30% of cement, 15-20% of mineral powder, 1-8% of heavy calcium powder, 1-7% of rheology regulator, and 1-3% of glass microspheres; In percentage terms, the quartz sand includes: 0.4mm≤particle size≤0.8mm quartz sand 5-15%, 0.3mm<particle size<0.4mm quartz sand 20-25%, 0.075mm≤particle size≤0.3mm quartz sand 10 ~20%. The ultra-high-performance concrete composition has good fluidity, can be self-leveling, has fluidity for a long time, has a proper slurry operation time, has a small self-shrinkage value, and has better durability and strength.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to an ultra-high-performance concrete composition with self-leveling and low self-shrinkage. Background technique [0002] Ultra-high performance concrete (UHPC) is an emerging cement-based composite material with the characteristics of ultra-high strength, high durability, and low porosity. Its compressive strength can usually reach above 120MPa. At present, UHPC has been gradually applied to bridges, building facade components, and various decorative components. [0003] The materials used in UHPC are different from ordinary materials, and its traditional composition materials include the following: (1) cement; (2) fine sand with good gradation; (3) finely ground quartz sand powder; (4) silica fume, partial Mineral admixtures such as kaolin; (5) high-performance water reducer; (6) fiber. [0004] With the development of UHPC materials, some products have been sold on the marke...

AI Technical Summary

Problems solved by technology

The ultra-high-performance concrete composition has good fluidity, self-leveling, long-lasting slurry fluidity, and small self-shrinkage value, which reduces the early stress concentration of components, avoids cracks in the later stage, and can also solve the problem of component bending deformation. Superior durability and strength at the same time

Images