二灰稳定再生集料混合料力学及疲劳性能研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (5): 1638-1645.

所属专题：资源综合利用

二灰稳定再生集料混合料力学及疲劳性能研究

边伟^1,2, 李亚龙^1,2, 高学凯^1,2, 荣亚鹏^1,2

1.山西省交通科技研发有限公司,太原 030032;
2.黄土地区公路建设与养护技术交通行业重点实验室,太原 030032

收稿日期:2020-12-06 修回日期:2021-01-11 出版日期:2021-05-15 发布日期:2021-06-07
作者简介:边伟(1991—),男,工程师。主要从事路面结构与材料研究。E-mail:Bianwei1011@163.com
基金资助:
国家自然科学基金(51808329);山西省重点研发计划(201803D31216-1);山西省优秀人才项目科技创新项目(201705D211030);山西交通控股集团科技项目(No.18-JKKJ-14,No.19-JKKJ-68)

Mechanical and Fatigue Properties of Lime-Fly Ash Stabilized Recycled Concrete Aggregate Mixture

BIAN Wei^1,2, LI Yalong^1,2, GAO Xuekai^1,2, RONG Yapeng^1,2

1. Shanxi Transportation Technology Research & Development Co., Ltd., Taiyuan 030032, China;
2. Key Laboratory of Highway Construction & Maintenance Technology in Loess Region, Taiyuan 030032, China

Received:2020-12-06 Revised:2021-01-11 Online:2021-05-15 Published:2021-06-07

摘要/Abstract

摘要： 本文分析了二灰稳定再生集料(LFSRCA)混合料的击实特性,研究了LFSRCA混合料无侧限抗压强度、劈裂强度、弯拉强度以及抗压回弹模量等力学性能的增长规律,建立了LFSRCA混合料的疲劳寿命预估模型,分析了LFSRCA混合料的疲劳特性。结果表明:随着再生集料(RCA)掺量的增大,LFSRCA混合料的最大干密度随之减小,最佳含水率随之增大;随着养生龄期的增长,LFSRCA混合料的各项力学性能均表现出相同的规律,在0~28 d内强度增长较慢,在28~60 d内迅速增长,在60~90 d内增长速度减慢,当养生龄期超过90 d后增长趋于平缓;LFSRCA混合料的各项力学性能以及疲劳寿命均随着RCA掺量的增大而减小;在低应力水平下,RCA掺量对LFSRCA混合料的疲劳寿命影响较大,在高应力水平下则影响减小。

关键词: 石灰, 粉煤灰, 再生集料, 掺量, 击实特性, 力学性能, 疲劳寿命

Abstract: The compaction properties of lime-fly ash stabilized recycled concrete aggregate (LFSRCA) mixture were analyzed, and the growth law of mechanical properties of the LFSRCA mixture such as unconfined compressive strength, splitting strength, flexural tensile strength, and compressive resilient modulus of resilience were studied. The fatigue life prediction method of the LFSRCA mixture was established, and the fatigue properties of the LFSRCA mixture were analyzed. The results show that with the increase of recycled concrete aggregate (RCA) content, the maximum dry density of the LFSRCA mixture decreases, and the optimum water content increases. With the increase of curing period, the mechanical properties of the LFSRCA mixture have the same growth law. The strength of the mixture increases slowly during the curing period from 0 d to 28 d, rapidly increases within 28 d to 60 d, and then the growth rate slows down within 60 d to 90 d, and finally, the strength growth tended to be flat when the curing period exceeded 90 d. The mechanical properties and fatigue life of the LFSRCA mixture decrease with the increase of RCA content. Effect of RCA content on fatigue life of the LFSRCA mixture at low stress level is higher than that at high stress level.

Key words: lime, fly ash, recycled concrete aggregate, dosage, compaction property, mechanical property, fatigue life

中图分类号:

U416.214

边伟, 李亚龙, 高学凯, 荣亚鹏. 二灰稳定再生集料混合料力学及疲劳性能研究[J]. 硅酸盐通报, 2021, 40(5): 1638-1645.

BIAN Wei, LI Yalong, GAO Xuekai, RONG Yapeng. Mechanical and Fatigue Properties of Lime-Fly Ash Stabilized Recycled Concrete Aggregate Mixture[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(5): 1638-1645.

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二灰稳定再生集料混合料力学及疲劳性能研究

Mechanical and Fatigue Properties of Lime-Fly Ash Stabilized Recycled Concrete Aggregate Mixture

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