含玻璃粉超高性能混凝土力学性能及微观结构研究

摘要/Abstract

摘要： 玻璃粉(GP)是一种环保型的固废材料。为了有效节约资源和解决环境污染问题,本文利用GP制备了一种绿色超高性能混凝土(UHPC),研究了GP作为一种矿物掺合料对UHPC力学性能和微观结构的影响。研究结果表明:GP的掺入改善了UHPC的流动性,并且降低了UHPC早期力学性能,但对后期力学性能产生显著的增强作用。当GP掺量为20%(质量分数)时,UHPC试样28 d的抗压强度趋近于基准组,而90 d的抗压强度较基准组提高了13.2%。且UHPC试样(90 d)表现出最低的总孔隙率,与基准组试样相比降低了14.6%。同时高密度水化硅酸钙凝胶的含量增加了20%,从而使UHPC形成更加致密的微观结构。GP具有良好的微集料填充效应和火山灰效应。

关键词: 超高性能混凝土, 玻璃粉, 力学性能, 微观结构, 流动性, 孔隙率

Abstract: Glass powder (GP) is an environmental-friendly solid waste material. A kind of green ultra-high performance concrete (UHPC) was prepared using GP in order to save resources and solve the environmental pollution problem effectively. The effect of GP as a variety of supplementary cementitious materials on the mechanical properties and microstructure of UHPC was studied. Results show that GP improves the flowability of UHPC. The incorporation of GP reduces the early age mechanical properties of UHPC, while enhances the mechanical properties of UHPC at later age. The compressive strength of UHPC sample with 20% (mass fraction) GP at 28 d is close to that of the reference group, while the compressive strength at 90 d is 13.2% higher than that of the reference group. UHPC sample (90 d) with an addition of 20% GP owns the lowest total porosity, which is 14.6% lower than that of the reference group. At the same time, the content of high-density hydrated calcium silicate gel increases by 20%, resulting in denser microstructure of UHPC. GP has a good combination of the micro-aggregate filling effect and the pozzolanic effect.

Key words: ultra-high performance concrete, glass powder, mechanical property, microstructure, flowability, porosity

中图分类号:

TU528.01

杨震樱, 周长顺. 含玻璃粉超高性能混凝土力学性能及微观结构研究[J]. 硅酸盐通报, 2021, 40(12): 3956-3962.

YANG Zhenying, ZHOU Changshun. Mechanical Properties and Microstructure of Ultra-High Performance Concrete Containing Glass Powder[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 3956-3962.

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