Special composite admixture for ultra-high performance concrete, preparation method and concrete

• Main Authors: WANG MAOYUE, DAI YIYONG, WANG YUBIN, PAN DONG, GAO LEILEI, YIN SHAONING, YUAN PENG, WANG NA, LI YONGCHAO, GUO YINGBIN, SUN JUNMIN, LI DUANLE, LIAO SHUCONG, WANG MINGQUAN, ZHANG CHANG'AN
• Format: Patent
• Language: Chinese; English
• Published: 29.09.2023
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; LIME, MAGNESIA; METALLURGY; REFRACTORIES; SLAG; TREATMENT OF NATURAL STONE

The invention provides a special composite admixture for ultra-high performance concrete, a preparation method and concrete. The composite admixture comprises slag powder, boric sludge acid leaching tailings, desulfurized gypsum, marble powder, a defoaming agent and an expanding agent. According to the special composite admixture for the ultra-high performance concrete, raw materials needing to be calcined are not used in the special composite admixture, the admixture is industrial solid waste with the relatively low comprehensive utilization rate, silica fume does not need to be doped when the ultra-high performance concrete is prepared, and the production cost can be saved. The composite admixture provided by the invention improves the problems of large shrinkage and poor flowability of ultra-high performance concrete, and meanwhile, due to the use of a large amount of solid waste, the use amount of cement is reduced, and the composite admixture is green, low-carbon and environment-friendly and is simple in