Low-shrinkage and low-viscosity high-strength concrete

Abstract

The invention discloses low-shrinkage and low-viscosity high-strength concrete. The low-shrinkage and low-viscosity high-strength concrete is prepared from the following raw materials in parts by weight: 80 to 95 parts of microsphere, 75 to 90 parts of pottery sand, 50 to 65 parts of cement, 45 to 60 parts of mineral powder, 40 to 55 parts of ultrafine slag silicon ash, 25 to 40 parts of carbon fiber, 25 to 40 parts of fiber bar, 15 to 30 parts of a compound foaming agent, 5 to 20 parts of an efficient water reducing agent and the balance of water; a preparation method of the low-shrinkage andlow-viscosity high-strength concrete comprises the following steps: adding the microsphere, the pottery sand and the cement into a stirring machine in sequence according to the weight part; then adding the mineral powder, the ultrafine slag silicon ash and the carbon fiber in sequence and stirring for 20 to 35min to obtain a mixed solution A; adding the fiber bar into a crushing machine accordingto the weight part and crushing; then adding into the mixed solution A to obtain a mixed solution B; adding the compound foaming agent, the efficient water reducing agent and the water into the mixedsolution B in sequence; foaming and naturally airing at 135 to 140 DEG C to obtain the low-shrinkage and low-viscosity high-strength concrete. According to the low-shrinkage and low-viscosity high-strength concrete, concrete shrinkage cracks are reduced by adopting the fibers; the microspheres are used for improving the viscosity of the ultrahigh-strength concrete and the flowability is improved;the high-strength concrete can be widely applied to the field of construction engineering and has good performance.

Description

technical field [0001] The invention relates to the technical field of high-strength concrete, in particular to low-shrinkage, low-viscosity high-strength concrete. Background technique [0002] As a new building material, high-strength concrete has been widely used in high-rise building structures, long-span bridge structures and some special structures due to its advantages of high compressive strength, strong deformation resistance, high density and low porosity. application. The biggest feature of high-strength concrete is its high compressive strength, which is generally 4 to 6 times that of ordinary-strength concrete, so the cross-section of components can be reduced, so it is most suitable for high-rise buildings. The test shows that under the condition of certain axial compression ratio and proper hoop ratio, the high strength concrete frame column has better seismic performance 。 Moreover, the size of the section of the column is reduced, the self-weight is reduce...

AI Technical Summary

Problems solved by technology

Such as Chinese patent CN108947566A "a kind of low-shrinkage low-viscosity high-strength concrete", using fiber to reduce concrete shrinkage cracks, reducing concrete shrinkage cracks, but causing difficulties in concrete delivery; using mineral powder to increase the strength of concrete, but its technology has not yet solved the problem of high sticky problem