High-strength and high-toughness fiber concrete based on geopolymer artificial aggregate and preparation method of high-strength and high-toughness fiber concrete

Abstract

The invention discloses high-strength and high-toughness fiber concrete based on geopolymer artificial aggregate and a preparation method of the high-strength and high-toughness fiber concrete. The preparation method comprises the following steps: preparing the geopolymer artificial aggregate; the geopolymer artificial aggregate is pre-wetted to achieve saturated surface dryness; cement, silica fume and the geopolymer artificial aggregate with the saturated surface dry are mixed and stirred; adding water and a water reducing agent, and stirring to obtain slurry; adding chopped fibers, and stirring; and putting into use after preliminary maintenance and soaking maintenance. According to the high-strength and high-toughness fiber concrete based on the geopolymer artificial aggregate, the compressive strength is not smaller than 100 MPa, and the ultimate tensile strain is not smaller than 1%. According to the invention, the geopolymer artificial aggregate is synthesized from industrial wastes, and the micro-mechanical properties of the fiber concrete material are regulated on the basis of the geopolymer artificial aggregate, so that the high-strength and high-toughness fiber concrete material is prepared, and a new technical path is provided for high-value utilization of the industrial wastes and performance optimization of cement-based materials. 本发明公开了一种基于地聚合物人工骨料的高强高韧纤维混凝土及其制备方法，制备步骤包括：制备地聚合物人工骨料；将地聚合物人工骨料进行预湿，达到饱和面干；将水泥、硅灰与饱和面干的地聚合物人工骨料混合，并搅拌；加入水和减水剂，并搅拌，获得浆体；加入短切纤维，并搅拌；经过初步养护和浸水养护后投入使用。所述基于地聚合物人工骨料的高强高韧纤维混凝土，抗压强度不小于100MPa，极限拉伸应变不小于1％。本发明采用工业废料合成地聚合物人工骨料，并基于此调控纤维混凝土材料的微观力学性能，从而制备出高强度高韧性纤维混凝土材料，为工业废料的高值化利用和水泥基材料的性能优化提供了新的技术路径。