Machine-made sand and aeolian sand co-doped ultra-high performance concrete and preparation method thereof

Abstract

The invention relates to machine-made sand and aeolian sand co-doped ultra-high performance concrete and a preparation method thereof. The content per cube of the machine-made sand and aeolian sand co-doped ultra-high performance concrete comprises: 650 to 850 kg / m<3> of cement, 300 to 450 kg / m<3> of a mineral admixture, 600 to 800 kg / m<3> of machine-made sand, 200 to 400 kg / m<3> of aeolian sand,78 to 220 kg / m<3> of steel fiber, 11.2 to 14.2 kg / m<3> of a water reducing agent and 185 to 210 kg / m<3> of water. The machine-made sand and the aeolian sand are adopted to replace natural river sand,the prepared machine-made sand and aeolian sand co-doped ultra-high performance concrete has good working performance, mechanical performance and durability, the problem of shortage of natural river sand resources is solved, local resources are reasonably utilized, and the production cost is reduced.

Description

technical field [0001] The application belongs to the technical field of building materials, and in particular relates to an ultra-high-performance concrete compounded with machine-made sand and aeolian sand and a preparation method thereof. Background technique [0002] Due to the advantages of ultra-high strength, ultra-high toughness, and ultra-high durability, ultra-high performance concrete (UHPC) has been gradually used in bridges, roads, municipalities, nuclear power plants, ports, and military projects since it was developed in the 1990s. , is currently the key research object of researchers in the industry, but there is little research on the application of ultra-high performance concrete in the western region where natural river sand is scarce. [0003] With the continuous development of railway construction to the central and western regions, the natural river sand used as an ideal fine aggregate for concrete in the western region of my country is becoming more an...

AI Technical Summary

Problems solved by technology

The particles of aeolian sand are small and uniform, and the fineness modulus is small. As a fine aggregate, it is not suitable to be used in concrete alone. The reasonable combination of aeolian sand and machine-made sand can improve the particle gradation of fine aggregate and affect the flow of concrete. The performance can be promoted, but the viscosity and water retention of aeolian sand are poor, and the strength of concrete will be affected if the amount is too high. It is necessary to strictly control the amount of aeolian sand and match it with machine-made sand in an appropriate proportion to prepare super super performance. high performance concrete

There have been extensive examples and research reports on the application of machine-made sand to concrete. Although there are problems such as irregular shape, poor gradation, large fineness modulus, and high stone powder content, if the particle size and fineness of machine-made sand Modulus, stone powder content and methylene blue value, etc. are controlled, and at the same time mixed with a suitable proportion of aeolian sand, it is entirely feasible to prepare ultra-high performance concrete with good performance of machine-made sand and aeolian sand.

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