Super-early-strength high-ductility cement based composite material and preparation method thereof

Abstract

The invention relates to a super-early-strength high-ductility cement based composite material and a preparation method thereof. The composite material comprises the following ingredients in percentage by weight: 30% to 40% of sulfoaluminate cement, 5% to 15% of silicate cement, 2% to 4% of silica fume, 40% to 50% of quartz sand, 3% to 5% of steel fibers and 0.3% to 1% of additives, wherein the additives comprise a water reducing agent, an antifoaming agent, a setting retarder and an early strength agent. The prepared super-early-strength high-ductility cement based composite material has the characteristics that the initial degree of expansion is higher than 700mm, the 2h compressive strength is higher than 30MPa, the 28d compressive strength is higher than 100MPa, the flexural-tensile strength is higher than 15MPa, and the limit tensile strain is higher than 0.15%. According to the super-early-strength high-ductility cement based composite material and the preparation method thereof, sulfoaluminate cement grains, silicate cement grains, silica fume grains and quartz sand form good grain size distribution, and the ultrafine steel fibers and the additives are added extensively, so that the composite material has the advantages of high work performance, super early strength, high ductility and high durability; when the composite material is applied to rapid repair of architecture, traffic can be opened 2 hours after construction, the construction influence is minimized, and meanwhile, a safe, reliable and more durable first-aid repair effect is achieved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a cement-based composite material with super early strength and high ductility and a preparation method thereof. Background technique [0002] As the service life of concrete structures and steel-concrete composite structures in important traffic parts such as bridges, airports, subways and expressways increases, the service environment becomes increasingly harsh, resulting in increasing structural damage year by year. Rapid repair materials are urgently needed to repair the structures in engineering. Existing rapid repair materials mainly include rapid-hardening concrete, rapid-hardening mortar, and polymer materials. [0003] Traditional rapid-hardening concrete and rapid-hardening mortar materials have shortcomings such as high brittleness, low bond strength, difficult construction, poor durability, and low later strength; polymer materials themselves have low stren...

AI Technical Summary

Problems solved by technology

[0003] Traditional rapid-hardening concrete and rapid-hardening mortar materials have shortcomings such as high brittleness, low bond strength, difficult construction, poor durability, and low later strength; polymer materials themselves have low strength, inconsistent deformation and structure, poor durability, and easy aging and other shortcomings

These two types of materials are used in important traffic engineering repairs with fast attenuation and low service life. They need to be repaired in 2-3 years. The repair process is seriously polluted and the economic and social benefits are poor.

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