Effect of Wetting on Unconfined Compressive Strength of Cemented Sands
Effect of Wetting on Unconfined Compressive Strength of Cemented Sands
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DOI：
10.1061/(asce)gt.1943-5606.0000399
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发表时间：
2010-12
影响因子：
3.9
通讯作者：
Sungsik Park
中科院分区：
文献类型：
--
作者：
Sungsik Park
弱胶结砂和砾石已部分或全部用于建造土质结构，如水坝和挡土墙。这种通常具有高度渗透性的胶结土壤在固化过程中会由于临时降雨或地下水位的变化而经历反复的润湿和干燥。在本研究中，采用四种不同水泥比的弱胶结砂试件，在最佳含水量下进行压实，固化28天。在固化过程中，对胶结砂试件进行反复润湿和干燥处理，评价其28天无侧限抗压强度。最后一天润湿1天会降低胶结砂的无侧限抗压强度，而养护中期润湿1天会提高强度。随着水泥比的增大，最后一天的湿化强度降低幅度减小。在28天的反复润湿和干燥下，试样的强度随着润湿次数的增加而增加，最多可达3个周期。经过三个干湿循环后，强度要么保持不变，要么由于水化和/或清洗胶凝材料所需的水不足而略有下降。
A weakly cemented sand and gravel has been partly or entirely used in the construction of earth structures such as dams and retaining walls. Such cemented soils that are usually highly permeable can undergo repetitive wetting and drying during curing due to temporary rainfall or a change in the groundwater table. In this study, weakly cemented sand specimens with four different cement ratios were compacted at optimum water content and cured for 28 days. When the cemented sand specimens were exposed to repetitive wetting and drying during curing, their 28-day unconfined compressive strength was evaluated. Wetting for one day on the last day was found to decrease the unconfined compressive strength of cemented sand, whereas wetting for one day in the middle of curing resulted in an increase in strength. The strength reduction due to wetting on the last day decreases as the cement ratio increases. For a specimen under repetitive wetting and drying over 28-day curing, the strength increases as the number of wetting increases up to three cycles. After three cycles of wetting and drying, the strength either becomes constant or slightly decreases due to insufficient water for hydration and/or washing cementitious materials.