碳纳米管纤维水泥基材料及其制备方法

Carbon nano-tube fiber cement-based material and preparation thereof

Abstract

碳纳米管纤维水泥基材料及其制备方法,它涉及一种增韧水泥基材料及其制备方法。本发明解决了现有纤维增韧水泥基材料抗弯、抗断裂强度偏低,韧性不高的问题。本发明由纤维分散剂、有机溶剂、碳纤维、碳纳米管、去离子水、超塑化剂、聚合物乳液、矿物掺合料和水泥制成的。本发明制备方法如下:将纤维分散液加入水泥混合浆料中搅拌后,将初步混合的浆料喂入高剪切胶体磨中高速剪切5~30min,再将搅匀的浆料装入试模中,移至真空干燥箱中,减压消泡,加热挥发溶剂0.5~3h,24h后拆模在室温水中养护28d,即得。采用本发明方法得到材料的断裂能G<sub>F</sub>及断裂韧度K<sub>CI</sub>分别为106.3N·m、0.998MPa/m<sup>-1/2</sup>,比已有的纤维增韧水泥基体材料的断裂能、断裂韧度分别高出112.6%、33.1%。
The invention relates to a cement-based material of carbon nano tube fiber and a preparation method thereof, in particular to a toughened cement-based material and a preparation method thereof. The invention solves the problems of relatively low anti-bending and anti-breaking intensity and toughness of the existing fiber toughened cement-based material. The material is produced by a fiber dispersant, an organic solvent, carbon fibers, carbon nano tubes, deionized water, a superplasticizer, a polymer emulsion, mineral admixture and cement. The preparation method of the invention is as follows: the fiber dispersant is added into mixed slurry of the cement and stirred; the primarily mixed slurry is fed into a high shearing colloid mill for shearing at high speed for 5 to 30min; the evenly stirred slurry is poured into a test mould which is moved to a vacuum drying case for pressure reducing and bubble-removing and heated for evaporation of the solvent for 0.5 to 3 hours; after 24 hours, and the material is obtained after tearing the mould and maintained in water at room temperature. The fracture energy GF and the fracture toughness of the material obtained by using the method of the invention respectively are 106.3N question mark m and 0.998Mpa/m<-1/2>, which are respectively 112.6 percent and 33.1 percent higher than the fracture energy and the fracture toughness of the existing fiber toughened cement-based material.

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