微细钢纤维对高弹性模量混凝土力学性能的影响

摘要/Abstract

摘要： 基于修正的Furnas堆积模型和骨料紧密堆积试验设计了一种高弹性模量混凝土,并利用微细钢纤维改善高弹性模量混凝土的韧性,研究了钢纤维体积掺量对骨料紧密堆积状态下混凝土流动性能、强度、弹性模量及弯曲韧性的影响规律。结果表明:采用紧密堆积骨料和适量微细钢纤维可以构筑高弹性模量韧性混凝土,其静弹性模量和动弹性模量最高分别可达50.15 GPa和53.23 GPa,断裂能可达5 680.45 N/m,残余弯曲韧度比从0增加到0.43;高弹性模量混凝土的流动性能随着钢纤维掺量的增加而降低,抗折强度、弹性模量及弯曲韧性则均随着钢纤维掺量的增加而增加,混凝土的抗压强度随着钢纤维掺量增加先增加后降低。在骨料紧密堆积状态下,综合考虑流动性能、力学性能和工程经济性,高弹性模量混凝土中微细钢纤维的合理掺量为0.4%(体积分数)。

关键词: 高弹性模量混凝土, 微细钢纤维, Furnas模型, 堆积密度, 弹性模量, 断裂韧性

Abstract: A high elastic modulus concrete was designed on the base of modified Furnas model and close-packing aggregates test results. In addition, steel microfibers were used to improve the toughness of high elastic modulus concrete. The effect of steel microfiber on fluidity, strength, elastic modulus and bending toughness of concrete under close-packing aggregates state was investigated. The results show that using close-packing aggregates and proper steel microfiber, the static and dynamic elastic modulus of concrete are up to 50.15 GPa and 53.23 GPa, respectively, the fracture energy is about 5 680.45 N/m, and the residual bending toughness ratio increases from 0 to 0.43. Moreover, with the increase of steel microfiber content, the fluidity of high elastic modulus concrete decreases, while the flexural strength, elastic modulus and bending toughness increase. With the increase of steel microfiber content, the compressive strength increases first and then decreases. In close-packing aggregates state, considering fluidity, mechanical properties and engineering economy, the resonable amount of steel microfiber in high elastic modulus concrete is 0.4% (volume fraction).

Key words: high elastic modulus concrete, steel microfiber, Furnas model, packing density, elastic modulus, fracture toughness

中图分类号:

TU528

唐延丰, 李庚英, 王林彬, 张敏. 微细钢纤维对高弹性模量混凝土力学性能的影响[J]. 硅酸盐通报, 2022, 41(12): 4225-4233.

TANG Yanfeng, LI Gengying, WANG Linbin, ZHANG Min. Effect of Steel Microfiber on Mechanical Properties of High Elastic Modulus Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(12): 4225-4233.

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