冻融循环作用下水泥稳定砂的性能

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL
Assel Jumassultan, Nazerke Sagidullina, Jong R. Kim, T. Ku, Sung-Woo Moon
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引用次数: 11

摘要

在寒冷地区,由于循环冻融作用,软弱土壤基础设施的完整性会受到严重破坏。利用土壤稳定技术可以减轻这种损害。一般来说,普通硅酸盐水泥(OPC)是研究化学-流体-力学行为最常用的粘结材料。然而,由于OPC产生大量二氧化碳排放的环境问题,硫铝酸钙(CSA)水泥可以作为生态可持续的替代品之一。虽然最近有一些研究对CSA处理砂的强度发展进行了研究,但尚未有研究关注循环冻融对CSA水泥稳定砂的影响。本研究旨在开展综合的实验室工作,评估循环冻融作用对CSA水泥处理砂强度和耐久性的影响。为此,对固化7天和14天的稳定土试件进行了0、1、3、5和7次冻融循环的无侧限抗压强度(UCS)和超声脉冲速度(UPV)试验。试验结果表明,随着冻融循环次数的增加,试件的强度和耐久性指标逐渐降低。冻融循环对所有土壤样品的强度和耐久性损失均有显著降低。总的来说,使用CSA作为沙质土壤的稳定剂将是一种环保的选择,可以在寒冷地区实现足够的强度和耐久性,以对抗冻融作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Performance of cement-stabilized sand subjected to freeze-thaw cycles
In cold regions, the integrity of the infrastructures built on weak soils can be extensively damaged by weathering actions due to the cyclic freezing and thawing. This damage can be mitigated by exploiting soil stabilization techniques. Generally, ordinary Portland cement (OPC) is the most commonly used binding material for investigating the chemo-hydro-mechanical behavior. However, due to the environmental issue of OPC producing a significant amount of carbon dioxide emission, calcium sulfoaluminate (CSA) cement can be used as one of the eco-sustainable alternatives. Although recently several studies have examined the strength development of CSA treated sand, no research has been concerned about CSA cement-stabilized sand affected by cyclic freeze and thaw. This study aims to conduct a comprehensive laboratory work to assess the effect of the cyclic freeze-thaw action on strength and durability of CSA cement-treated sand. For this purpose, unconfined compressive strength (UCS) and ultrasonic pulse velocity (UPV) tests were performed on the stabilized soil specimens cured for 7 and 14 days which are subjected to 0, 1, 3, 5, and 7 freeze-thaw cycles. The test results show that the strength and durability index of the samples decrease with the increase of the freeze-thaw cycles. The loss of the strength and durability considerably decreases for all soil samples subjected to the freeze-thaw cycles. Overall, the use of CSA as a stabilizer for sandy soils would be an eco-friendly option to achieve sufficient strength and durability against the freeze-thaw action in cold regions.
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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