Calculation of compressive strength of recycled concrete based on coarse aggregate quality and replacement rate

被引：0

作者：

Guo Y. ^{[1
]}

Li Q. ^{[1
]}

Yue G. ^{[1
]}

Li Q. ^{[1
]}

机构：

[1] School of Civil Engineering, Qingdao University of Technology, Qingdao

来源：

Li, Qiuyi (lqyyxn@163.com) | 2018年 / Science Press卷 / 39期

关键词：

Binder-water ratio; Compressive strength calculation formula; Recycled coarse aggregate concrete; Recycled coarse aggregate quality; Replacement rate; Static test;

D O I：

10.14006/j.jzjgxb.2018.04.017

中图分类号：

学科分类号：

摘要：

Due to the existence of hardened mortar and a large number of interface structures on the surface of recycled coarse aggregate, the compressive strength of recycled concrete is lower than that of ordinary concrete, and the compressive failure mechanism is much more complicated. To establish a universal calculation formula for compressive strength of recycled coarse concrete, recycled concrete was prepared by three kinds of recycled coarse aggregates with different replacement rates in the experiment. The effect of binder-water ratio and quality and replacement rate of recycled coarse aggregate on the compressive strength of recycled concrete was studied systematically, and the correlation between the water absorption, apparent density and crushing index of recycled coarse aggregate and its influence factors was analyzed. Based on the Bolomey compressive strength formula of normal concrete, the formula of compressive strength of recycled coarse aggregate concrete based on aggregate quality and replacement rate was established and compared with the commonly used compressive strength formula in terms of error comparison. The results show that it has a linear relationship between the compressive strength of recycled coarse aggregate concrete and the binder-water ratio and replacement rate. The quality of recycled coarse aggregate has a significant effect on the compressive strength of recycled concrete. The error analysis shows that, compared with the test results, the maximum calculation error of Bolomey formula for the compressive strength of ordinary concrete is about 16.51%, and the maximum calculation error of the compressive strength of recycled coarse aggregate concrete based on effective binder-water ratio is about 36.33%, but the maximum calculation error of the compressive strength of recycled concrete based on different quality and replacement rate of recycled coarse aggregate is only 4.90%. Therefore, the newly established compressive strength formula of recycled coarse aggregate concrete has higher accuracy and better applicability. © 2018, Editorial Office of Journal of Building Structures. All right reserved.

引用

页码：153 / 159

页数：6

共 16 条

[1] Li Q., Gao S., Xue S., Green Concrete Technology, pp. 19-22, (2014)
[2] Monalisa B., Bhattacharyya S.K., Minocha A.K., Et al., Recycled aggregate from C&D waste and its use in concrete-a break through towards sustainability in construction sector: a review, Construction and Building Materials, 68, 7, pp. 501-516, (2014)
[3] Kiyoshi E., Kohji T., Akira N., Et al., Application of recycled coarse aggregate by mixture to concrete construction, Construction and Building Materials, 21, 7, pp. 1542-1551, (2007)
[4] Hu Q., Song C., Zou C., Experimental research on the mechanical properties of recycled concrete, Journal of Harbin Institute of Technology, 41, 4, pp. 33-36, (2009)
[5] Zhou J., He H., Meng X., Et al., Basic mechanical properties of recycled concrete experimental study, Journal of Shenyang Jianzhu University (Natural Science), 26, 3, pp. 464-468, (2010)
[6] Hao T., Shi L., Chen J., Experimental study on mechanical performances of recycled concrete, Building Structure, 43, 1, pp. 73-75, (2013)
[7] Corinaldesi V., Mechanical and elastic behavior of concretes made of recycled-concrete coarse aggregates, Construction and Building Materials, 24, 9, pp. 1616-1620, (2010)
[8] Sagoe-Crentsil K.K., Brown T., Taylor A.H., Performance of concretes made with commercially produced coarse recycled concrete aggregate, Cement and Concrete Research, 31, 5, pp. 707-712, (2001)
[9] Xiao J., Lei B., Yuan B., Splitting tensile strength distribution of concrete with different recycled aggregate concrete, Journal of Building Materials, 11, 2, pp. 223-229, (2008)
[10] Wang X., Influence of quality and substitution rate of recycled coarse aggregate on mechanical performances of recycled concrete, pp. 29-42, (2015)

← 1 2 →