High-activity low-temperature rice hull ash and high-performance concrete doped with rice hull ash

Abstract

The invention discloses high-activity low-temperature rice hull ash and high-performance concrete doped with the rice hull ash. The active low-temperature rice hull ash is prepared by the following method: subjecting rice hulls to boiling water bath in 1% hydrochloric acid for 1 h, washing the rice hulls with water, then drying the rice hulls in the sun, and removing impurities in the rice hulls;firing the pretreated rice hulls in a furnace at 600-700 DEG C for 30-60 minutes, and then performing cooling; and carrying out ball milling on the fired rice hull ash in a ball mill of 500-800r / min for 10-30min to obtain the high-activity low-temperature rice hull ash of which the SiO2 content exceeds 90wt%. The high-performance concrete doped with the high-activity low-temperature rice hull ashis prepared from the following raw materials in percentage by weight: 15%-20% of Portland cement, 5%-10% of the high-activity low-temperature rice hull ash, 10%-15% of coal ash, 20%-30% of river sand,25%-35% of basalt stone, 6%-12% of water and 0.4%-1% of a water reducing agent. The rice hull ash has high purity and high activity and can effectively replace silica fume to serve as a mineral admixture, the prepared high-performance concrete is excellent in mechanical property, the cement consumption is greatly reduced while the rice hull utilization rate is increased, and the concrete cost isreduced.

Description

technical field [0001] The invention relates to a high-performance low-temperature rice husk ash and high-performance concrete mixed with the rice husk ash, belonging to the technical field of building materials. Background technique [0002] With the rapid development of the global economy and the continuous advancement of large-scale infrastructure projects, more and more requirements are put forward for the strength, toughness, safety and durability of concrete building materials. High-performance concrete materials are more and more widely used in high-rise, long-span, marine, protection, harsh environment and other projects because of their excellent mechanical properties, durability and safety and reliability. The requirements for high-performance concrete in construction projects are also increasing. In terms of concrete performance regulation, it is constantly required to reduce porosity, optimize pore structure, and increase compactness. It is an effective technica...

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: In view of the problems that the existing rice husk ash has low purity and activity and cannot effectively enhance the performance of cement-based materials, the present invention provides a high-activity low-temperature rice husk ash, and provides a high-performance concrete

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