Long-Term Effect of Curing Temperature on the Strength Behavior of Cement-Stabilized Clay
Long-Term Effect of Curing Temperature on the Strength Behavior of Cement-Stabilized Clay
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DOI：
10.1061/(asce)gt.1943-5606.0001144
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发表时间：
2014-08
影响因子：
3.9
通讯作者：
Rong-jun Zhang;Y. T. Lu;T. Tan;K. Phoon;A. Santoso
中科院分区：
文献类型：
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作者：
Rong-jun Zhang;Y. T. Lu;T. Tan;K. Phoon;A. Santoso
养护温度对混凝土、砂浆或水泥稳定粒状土强度发展的影响已在文献中广泛报道。然而，有较少的研究集中在水泥稳定粘土。关键的区别在于水泥稳定粘土中火山灰反应的存在，这会产生比混凝土、砂浆或水泥稳定颗粒土更复杂的强度发展行为。本文的目的是澄清这种差异使用广泛的数据收集的一部分，在新加坡的土地复垦项目。五种不同的水泥稳定新加坡海洋粘土混合物在不同的温度下固化。它们的强度随时间的发展进行了研究，通过测试无侧限压缩下的标本在不同的固化年龄（最多1年）。实验结果表明，较高的固化温度不仅会导致较高的短期强度，而且还会导致较高的长期/极限强度。基于实验结果，提出了一个模型，结合成熟度理论通常用于混凝土或砂浆与建议的温度增强强度因子，它考虑到固化温度对水泥稳定粘土中发生的火山灰反应的影响。该模型通过另一个独立的新加坡数据集和从文献中收集的数据集进行了验证。
The influence of curing temperature on the strength development of concrete, mortar, or cement-stabilized granular soils has been widely reported in the literature. However, there are fewer studies focusing on cement-stabilized clay. The key difference is the presence of pozzolanic reactions in cement-stabilized clay, which give rise to more complex strength-development behaviors than those of concrete, mortar, or cement-stabilized granular soils. This paper aims to clarify this difference using extensive data collected as part of a land reclamation project in Singapore. Five different mixes of cement-stabilized Singapore marine clay are cured under different temperatures. Their strength development with time is studied by testing the specimens under unconfined compression at various curing ages (up to 1 year). The experimental results show that a higher curing temperature gives rise to not only higher short-term strengths but also higher long-term/ultimate strengths. Based on the experimental results, a model is proposed that combines the maturity theory commonly used for concrete or mortar with a proposed temperature-enhanced strength factor, which takes into account the effect of curing temperature on pozzolanic reactions occurring in cement-stabilized clay. This proposed model is validated by another independent Singapore data set and data sets collected from the literature.