2results about How to "Low crush value" patented technology

This invention relates to a pretreated reinforced recycled aggregate concrete and its preparation method, comprising the following raw materials: 320-360 parts cement; 20-40 parts fly ash; 80-120 parts mineral powder; 585-670 parts manufactured sand; 1050-1200 parts recycled coarse aggregate; 156-172 parts water; and 11-12.3 parts admixtures. After pretreatment, the concrete prepared from the recycled coarse aggregate exhibits significantly improved performance compared to the untreated recycled coarse aggregate. The synergistic effect of multiple pretreatment methods significantly improves the water absorption, crushing index, and apparent density of the raw coarse aggregate. Pretreatment of the recycled coarse aggregate provides enhanced conditions for internal hydration in the recycled concrete and simultaneously improves the surface roughness of the recycled coarse aggregate, thus enhancing the workability and increasing the strength of the concrete.

This invention belongs to the field of aggregate strengthening, specifically relating to a silicon-based composite reagent-strengthened recycled aggregate and its preparation method. The preparation method includes the following steps: crushing and sieving virgin mortar samples, then rinsing to remove impurities to obtain low-quality recycled coarse aggregate; then, under certain conditions, adding lime slurry and surfactant to the low-quality recycled coarse aggregate, stirring, and allowing it to stand, followed by cyclic stirring; then adding water, a hydrophobic agent, silica fume, and fly ash, and maintaining standing for 6–12 hours; finally, immersing in water to remove soluble impurities from the surface of the recycled aggregate, and air-drying to obtain the silicon-based composite reagent-strengthened recycled aggregate. This method, by comprehensively utilizing industrial by-products such as silica fume and fly ash, explores the application potential of industrial waste products in the field of construction solid waste resource utilization, increases resource utilization rate, efficiently utilizes industrial solid waste, and is conducive to resource conservation and the reuse of waste.