Shrinkage-compensating and high-ductility cement-based composite material

Abstract

The invention discloses a shrinkage-compensating and high-ductility cement-based composite material. The shrinkage-compensating and high-ductility cement-based composite material is characterized by mainly being prepared from cement, composite mineral admixture, artificially grading sand with specific particle size, large-volume mixing fibers, additives and mixing water. When the shrinkage-compensating and high-ductility cement-based composite material is used, different fiber varieties are used according to actual projects, and the raw material proportion of the composite material is regulated through an adaptation experiment at the same time. By the method, the composite material is low in shrinkage and high in ductility and applicable to various complex load-bearing structures such as expansion joints, wet joints, bridge deck pavement and tunnel lining in traffic engineering.

Description

technical field [0001] The invention belongs to the technical field of concrete materials, and particularly relates to a shrinkage-compensating high-ductility cement-based composite material, which can be widely used in new structures under complex loads and special environments in road traffic engineering, and can also be used for reinforcement of existing structures , Repair and expansion projects. Background technique [0002] Concrete materials are quasi-brittle materials, which are resistant to compression but not to tension. In the actual use of civil and traffic engineering, especially in certain structural parts that are subject to complex loads and environmental conditions (such as expansion joints) , wet joints, bridge deck pavement and tunnel lining, etc.), often due to the low bending and tensile strength of concrete materials, low ultimate strain, insufficient impact resistance and poor ability to adapt to alternating loads, the structure or component It is eas...

AI Technical Summary

Problems solved by technology

However, due to the current ECC-related research results, in order to highlight the deformation ability of materials under load, imported PVA and PE fibers are generally used as raw materials, which makes the cost of materials very high; and because ECC does not use coarse aggregates, fine aggregates use 70-140 mesh (or higher mesh) machine-made quartz sand, in the case of a large proportion of cementitious materials, will make the ECC shrink during hydration and hardening. The adaptability is limited, which restricts the popularization and application of this material in engineering

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