市政技术2024，Vol.42Issue(5)：40-46,7.DOI:10.19922/j.1009-7767.2024.05.040
石灰粉煤灰稳定再生料基层级配设计与力学性能研究
Study on Base Gradation Design and Mechanical Properties of Lime-Fly Ash Stabilized Recycled Materials
杨雄杰 1寇轩 1常超 1蔡润池 1李瑞云1
作者信息
- 1. 陕西华山路桥集团有限公司,陕西西安 710005||陕西正诚路桥工程研究院有限公司,陕西西安 712000
- 折叠
摘要
Abstract
In order to obtain the appropriate dosage of recycled brick mixture for road base mixture,the relationship between the mix ratio and mechanical properties of lime fly ash stabilized recycled material base was studied.Firstly,the gradation design of the mixture was carried out,and the proportion of coarse aggregate was determined by grad-ing filling vibration test;Then,the proportion of fine aggregate was determined by indoor compaction test.The mix-ing way of recycled material was determined by crushing value and unconfined compressive strength;Finally,under different dosage of recycled materials and lime fly ash stabilized inorganic binders,the unconfined compressive strength and compressive resilient modulus tests were carried out to determine the variation of mechanical properties.The results show that the compactness is the best when the proportion of coarse aggregate is 19:22:17 and the pro-portion of fine aggregate is 42.5％;The brick-concrete ratio replaced by recycled material is 4:6 with the order of particle size replacement is 10～20 mm first and then 5～10 mm;The maximum compressive strength on 7 d and 28 d reach 1.347 and 2.756 MPa respectively,and the increase of the amount of recycled materials was similar with the attenuation trend;Under high recycled material content,the compressive resilient modulus with 20％～25％lime fly ash dosage on 180 d is better;The fitting degree of unconfined compressive strength on 7 d and 180 d is higher.The feasibility of construction waste coarse aggregate for road base is verified by the mix ratio design scheme,and the relationship model between compressive rebound modulus and compressive strength value is estab-lished,which provide reference for the application of construction waste in road base construction.关键词
石灰粉煤灰/再生料/基层级配设计/无侧限抗压强度/抗压回弹模量Key words
lime fly ash/recycled material/base gradation design/unconfined compressive strength/compressive modulus of resilience分类
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杨雄杰,寇轩,常超,蔡润池,李瑞云..石灰粉煤灰稳定再生料基层级配设计与力学性能研究[J].市政技术,2024,42(5):40-46,7.
