摘要
为解决煤矸石强度低、水稳性差的问题,采用电石灰和粉煤灰协同稳定煤矸石混合料,并通过室内试验系统分析其力学性能。选用河南平顶山产的煤矸石、电石灰及粉煤灰作为原料,设计16种配合比方案,分别开展击实试验、无侧限抗压强度、劈裂强度及抗压回弹模量测试,并评估其水稳性。结果表明:(1)电石灰和粉煤灰可代替传统“二灰”材料稳定煤矸石,用于路面基层铺设;(2)煤矸石含量与压实度是影响混合料性能的核心因素。当煤矸石占比为70%~75%、电石灰与粉煤灰比例为12~12.5时,混合料的7 d无侧限抗压强度可达0.91~1.08 MPa(98%压实度),劈裂强度最高为0.025 MPa,满足高速或一级公路重载交通条件下路面基层的使用要求;(3)混合料抗压回弹模量和水稳性在养护初期增长较快,后期趋于稳定,路面基层养护初期需严控水分和重载以防强度发生破坏。
To address the issues of low strength and poor water stability of coal gangue,a method using electric lime and fly ash to stabilize coal gangue mixtures has been proposed.And systematic indoor tests were conducted to analyze the mechanical properties of the mixtures.Coal gangue,electric lime,and fly ash from Pingdingshan,Henan were selected as raw materials,and 16 different mix proportion schemes were designed.Compaction tests,unconfined compressive strength tests,splitting tensile strength tests,and compressive resilient modulus tests were carried out,and the water stability was evaluated.The results show that:(1)Electric lime and fly ash can replace traditional"lime and fly ash"to stabilize coal gangue for road base paving.(2)The content of coal gangue and the degree of compaction are the core factors affecting the performance of the mixture.When the proportion of coal gangue is 70%to 75%,and the ratio of electric lime to fly ash is 1 G:2 to 1:2.5,the 7-day unconfined compressive strength of the mixture can reach 0.91 to 1.08 MPa(at 98%compaction),with the highest splitting tensile strength being 0.025 MPa,meeting the requirements for heavy traffic conditions on expressways or first-class highways.(3)The compressive resilient modulus and water stability grow rapidly in the early stages of curing and then tend to stabilize.During the initial curing period of the road base,strict control of moisture and heavy traffic is necessary to prevent strength degradation.
作者
李艳丽
夏清
王功浩
邝端阳
任明洋
夏英志
LI Yan-li;XIA Qing;WANG Gong-hao;KUANG Duan-yang;REN Ming-yang;XIA Ying-zhi(Henan Zhongping Jiaoke Research and Design Institute Co.,Ltd.,Pingdingshan 467000,China;School of Civil and Transportation Engineering,Henan University of Urban Construction,Pingdingshan 467036,China)
出处
《河南城建学院学报》
2025年第4期35-42,共8页
Journal of Henan University of Urban Construction
基金
平顶山市重大科技专项(K-H2023312)
河南省高等学校重点科研项目(25B560015)。
关键词
电石灰
粉煤灰
煤矸石
路面基层
水稳性
力学性能
electric lime
fly ash
coal gangue
pavement base
water stability
mechanical properties
