石灰-粉煤灰-水泥稳定碎石的力学性能试验

兰州理工大学学报 ›› 2023, Vol. 49 ›› Issue (2): 125-129.

石灰-粉煤灰-水泥稳定碎石的力学性能试验

贾亮^*, 连尚承

兰州理工大学土木工程学院, 甘肃兰州 730050

收稿日期:2020-07-12 出版日期:2023-04-28 发布日期:2023-05-05
通讯作者: 贾亮(1978-),男,甘肃会宁人,博士,副教授.Email:jialiang@lut.edu.cn

Experimental study on the mechanical properties of lime-fly ash-cement stabilized macadam

JIA Liang, LIAN Shang-cheng

School of Civil Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China

Received:2020-07-12 Online:2023-04-28 Published:2023-05-05

摘要/Abstract

摘要： 石灰-粉煤灰-普通硅酸盐水泥稳定碎石是一种常用的路面基层材料,但其早期强度较低,用作路面的维修养护材料时不能快速开放交通.为提高稳定碎石的早期强度,将其中的普通硅酸盐水泥用等质量的硫铝酸盐水泥替换,通过无侧限抗压强度试验(UCT)和劈裂拉伸强度试验(STS)对比了两种不同水泥综合稳定碎石的无侧限抗压强度(UCS)和劈裂拉伸强度(STS),并对无机结合料掺量、水泥掺量及级配对稳定碎石强度的影响开展了试验研究.结果表明,稳定碎石的UCS和STS随水泥含量的增加、养护龄期的增长而增大;养护龄期1 d的石灰-粉煤灰-硫铝酸盐水泥稳定碎石的UCS可达2.28 MPa,达到了路面基层开放交通的规定,且后期强度没有出现降低.论文为路面基层的快速维修养护提供了一种新材料.

关键词: 基层, 石灰-粉煤灰-水泥稳定碎石, 无侧限抗压强度, 劈裂拉伸强度

Abstract: Lime-fly ash-ordinary portland cement stabilized macadam is a common pavement base material, but its early strength is low. So, it cannot be used for the opened traffic swiftly. In order to enhance the early strength of stabilized macadam, ordinary Portland cement is substituted by sulfoaluminate cement with equal quality. The unconfined compressive strength (UCS) and split tensile strength (STS) of two kinds of cement stabilized macadam were compared by unconfined compressive strength test (UCT) and split tensile strength test (STS). At the same time, experimental research on the influence of inorganic binder content, cement content and grade-pairing strength of the macadam was carried out. The results show that the UCS and STS of stabilized macadam increase with the increase of cement content and curing age. The UCS of lime-fly ash-sulfoaluminate cement stabilized gravel in the curing period of 1 day can reach to 2.28 MPa, which meets the requirements of the road base open traffic with the strength not decreasing in the later period.A new material for quick maintenance of pavement base course is provided here.

Key words: road base, lime-fly ash-cement stabilized macadam, unconfined compressive strength, split tensile strength

中图分类号:

TU476

贾亮, 连尚承. 石灰-粉煤灰-水泥稳定碎石的力学性能试验[J]. 兰州理工大学学报, 2023, 49(2): 125-129.

JIA Liang, LIAN Shang-cheng. Experimental study on the mechanical properties of lime-fly ash-cement stabilized macadam[J]. Journal of Lanzhou University of Technology, 2023, 49(2): 125-129.

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