再生骨料级配对混凝土力学性能的影响及微观机理分析

李琼, 冯琼, 曹辉

江苏大学学报(自然科学版) ›› 2019, Vol. 40 ›› Issue (5) : 614-620.

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江苏大学学报(自然科学版) ›› 2019, Vol. 40 ›› Issue (5) : 614-620. DOI: 10.3969/j.issn.1671-7775.2019.05.019
论文

再生骨料级配对混凝土力学性能的影响及微观机理分析

作者信息 +

Effects of recycled aggregates gradation on mechanical performance of concrete and microscopic performance analysis

Author information +
文章历史 +

摘要

To investigate the influence of recycled coarse aggregates on the mechanical properties of concretes, various compressive strength tests of the cube at different ages were carried out using the concretes with a single gradation of 5.0 mm to 10.0 mm, 10.0 mm to 20.0 mm, 16.0 mm to 31.5 mm and continuous gradation from 5.0 mm to 31.5 mm and with the replacement rate of 30%,50% and 70%. The effects of aggregate on the mechanical properties of recycled concrete were revealed at microscopic level by scanning electron microscopy(SEM) and Xray diffraction(XRD). The results show that for low dosage, the strength at 112 d is almost the same as that of ordinary concrete when the size of aggregate content ranges from 5.0 mm to 10.0 mm. No matter how many dosages are selected, all the compressive strengthes of different age cubes are low when the aggregate content size ranges from 10.0 mm to 20.0 mm. When the aggregate content size ranged from 16.0 mm to 31.5 mm and 5.0 mm to 31.5 mm, the strength of recycled concrete is increased with an appropriate dosage.

Abstract

To investigate the influence of recycled coarse aggregates on the mechanical properties of concretes, various compressive strength tests of the cube at different ages were carried out using the concretes with a single gradation of 5.0 mm to 10.0 mm, 10.0 mm to 20.0 mm, 16.0 mm to 31.5 mm and continuous gradation from 5.0 mm to 31.5 mm and with the replacement rate of 30%,50% and 70%. The effects of aggregate on the mechanical properties of recycled concrete were revealed at microscopic level by scanning electron microscopy(SEM) and Xray diffraction(XRD). The results show that for low dosage, the strength at 112 d is almost the same as that of ordinary concrete when the size of aggregate content ranges from 5.0 mm to 10.0 mm. No matter how many dosages are selected, all the compressive strengthes of different age cubes are low when the aggregate content size ranges from 10.0 mm to 20.0 mm. When the aggregate content size ranged from 16.0 mm to 31.5 mm and 5.0 mm to 31.5 mm, the strength of recycled concrete is increased with an appropriate dosage.

关键词

recycled concrete / aggregate / compressive strength / SEM / XRD

Key words

 recycled concrete / aggregate / compressive strength / SEM / XRD

引用本文

导出引用
李琼, 冯琼, 曹辉. 再生骨料级配对混凝土力学性能的影响及微观机理分析[J]. 江苏大学学报(自然科学版), 2019, 40(5): 614-620 https://doi.org/10.3969/j.issn.1671-7775.2019.05.019
LI Qiong, FENG Qiong, CAO Hui. Effects of recycled aggregates gradation on mechanical performance of concrete and microscopic performance analysis[J]. Journal of Jiangsu University(Natural Science Edition), 2019, 40(5): 614-620 https://doi.org/10.3969/j.issn.1671-7775.2019.05.019

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基金

甘肃省青年科技基金资助项目(2017GS10910)


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