含废弃玻璃的绿色超高性能混凝土制备及性能

Preparation and Properties of Green Ultra high Performance Concrete Containing Waste Glass

关键词:  废弃玻璃  生态型  超高性能混凝土  力学性能  微观结构

Key words:  waste glass  sustainability  ultra high performance concrete（UHPC）  mechanical performance  microstructure

摘要:

利用废弃阴极射线管（CRT）玻璃取代河砂制备超高性能混凝土（UHPC），研究了废弃CRT玻璃对UHPC流动性、强度以及弯曲性能的影响，分析了UHPC的微观结构.结果表明：掺加废弃CRT玻璃显著提高了UHPC的流动性，降低了其强度和能量吸收能力；当废弃CRT玻璃替代率为25%时，UHPC力学性能指标的降幅均小于5%；废弃CRT玻璃抑制了水泥水化；掺加废弃CRT玻璃后，UHPC细骨料水泥浆体界面过渡区黏结较差，力学性能下降.

Abstract:

The river sand was replaced by waste cathode ray tube（CRT）glass to prepare green ultra high performance concrete(UHPC). The effect of waste CRT glass on the flowability, mechanical strength and bending performance of UHPC was investigated. The microstructure of UHPC was studied. The results show that the incorporation of waste CRT glass increases the flowability and reduces the mechanical strength and energy absorption capacity of UHPC. The reduction degree of properties indexes is less than 5 % when the replacement ratio of waste CRT glass is below 25%. The CRT glass restrains cement hydration. The addition of CRT glass also reduces the performance of interfacial transition zone in UHPC, which leads to the decreased mechanical strength.