Ultra-high toughness fiber reinforced polymer modified cement-based composite material and preparation method

Abstract

The invention relates to an ultrahigh-toughness fiber-reinforced polymer modified cementitious composite and a preparation method. The ultrahigh-toughness fiber-reinforced polymer modified cementitious composite is prepared from raw materials in parts by weight as follows: 100 parts of comprising cement, 50 parts of medium sand, 25-35 parts of polymer emulsion (in terms of solid content), synthetic polymer fibers, 0.1-0.5 parts of a water reducing agent, an antifoaming agent, 0.1-0.5 parts of a thickener and 30-40 parts of water according to a formula, wherein the synthetic polymer fibers account for 2.5% of the total volume of the composite, and the antifoaming agent accounts for 0.05%-0.2% of the mass of the polymer emulsion. Compared with the prior art, the ultrahigh-toughness fiber-reinforced polymer modified cementitious composite has the advantages of ultrahigh initial cracking strain, higher bending stress, higher initial cracking stress and the like.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an ultrahigh-toughness fiber-reinforced polymer modified cement-based composite material and a preparation method thereof. Background technique [0002] In 1992, Victor C.Li, a professor at the University of Michigan at ACE-MRL, used the principles of fracture mechanics and micromechanics to systematically design, adjust and optimize cement-based composite materials for the first time. Through the study of steady-state cracking and multi-slit cracking, The feasibility of preparing the cement-based composite material ECC——Engineered Cementitous Composite with ultra-high toughness is theoretically discussed. The original ECC was just a general reference, but today, due to its outstanding performance in toughness, it has been called "UltraHigh Toughness Cementitious Composites" (UHTCC) by some scholars. , and defined as: use short fiber reinforcement, and the...

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Problems solved by technology

At present, this material has entered the stage of industrialization from the research and development stage in foreign countries, but the products of a few foreign companies (such as Danish Densit) are in a monopoly position, not only the price is high, but also the core technology is kept secret, such as material formula, molding and maintenance process, etc. The key technology has not been reported in the public literature

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