Ultrahigh-performance concrete and preparation method and application thereof

Abstract

The invention discloses an ultrahigh-performance concrete and a preparation method and application thereof; the ultrahigh-performance concrete is characterized by being made from, by weight, 800-900 parts of cement, 250-300 parts of a mineral admixture, 1100-1200 parts of fine aggregate, 150-160 parts of fine steel fiber, 0.5-1.5 parts of a viscosity-reducing polycarboxylate superplasticizer, 80-90 parts of an expander, and 150-250 parts of clean water, wherein the fine aggregate is river sand 2.3-3.1 in fineness modulus, the mineral admixture comprises silica fume and level-I flyash, and the viscosity-reducing polycarboxylate superplasticizer is greater than 30% in water reducing rate; the ultrahigh-performance concrete is high in strength, the raw materials are widely resourced, the technique is reliable, the cost is relatively low, and the construction process is simple.

Description

technical field [0001] The present invention relates to a new type of material. More specifically, the present invention relates to an ultra-high performance concrete and its preparation method and application. Background technique [0002] Concrete segmental prefabricated assembled bridges are more and more favored by construction units due to their relatively simple construction technology and fast construction speed. In the construction process of concrete segmental prefabricated assembled bridges, the function of wet joints is to connect the beams to form a whole, so the treatment of wet joints is particularly important. Wet joints are generally constructed by adding an appropriate amount of expansion agent to ordinary concrete. Due to the slow strength development of ordinary concrete, especially in winter construction, the dismantling of the support plate is often delayed due to insufficient strength, which affects the construction speed. Therefore, ultra-high perfo...

AI Technical Summary

Problems solved by technology

[0003] However, since ordinary ultra-high-performance fiber-reinforced concrete is all made of fine aggregates, its shrinkage is much greater than that of ordinary concrete, which will lead to early cracking at the joints of light-weight composite beams, or cause the joints to have very low tensile capacity and cannot Meet the design requirements