气泡混合轻质土干湿循环和硫酸钠耐久性试验研究

发布时间：2018-05-16 01:45

本文选题：轻质土 + 水泥　；参考：《岩土力学》2015年S1期

【摘要】：采用水泥和地聚合物作为固化剂制备气泡混合轻质土,测试水泥轻质土(LCSC)和地聚合物轻质土(LGSC)在干湿循环和硫酸钠长期浸泡环境下的无侧限抗压强度和质量变化率,并相互进行对比,分析干湿循环级数和硫酸钠浸泡环境对其强度特性的影响规律。结果表明,标准养护地聚合物轻质土强度约为水泥轻质土的2倍;干湿循环后地聚合物轻质土强度随干湿循环级数衰减较快且破坏程度逐渐增大,水泥轻质土强度未出现明显衰减,与水泥轻质土相比,地聚合物轻质土抗干湿能力较差;硫酸钠溶液浸泡120 d后,地聚合物轻质土强度出现小幅下降,约为标准养护28 d试样的80%;水泥轻质土出现开裂破坏,与水泥轻质土相比,地聚合物轻质土抗硫酸钠侵蚀能力较强。
[Abstract]:Using cement and geopolymer as curing agent to prepare mixed lightweight soil with air bubbles, the compressive strength and mass change rate of unconfined compressive strength and mass were tested under dry and wet cycle and sodium sulfate soaking environment, respectively, in which the cement lightweight soil (LCSCC) and the geopolymer lightweight soil (LGSCC) were prepared. The effects of wet and dry cycle order and soaking environment of sodium sulfate on its strength characteristics were analyzed by comparing with each other. The results show that the strength of polymer light soil in standard curing area is about 2 times of that of cement light soil, and the strength of polymer light soil decreases rapidly with the order of dry and wet cycle and increases gradually after dry and wet cycling. The strength of cement lightweight soil did not decrease obviously, compared with that of cement light soil, the dry and wet resistance of geopolymer light soil was poor, and the strength of geopolymer light soil decreased slightly after 120 days of soaking in sodium sulfate solution. It is about 80% of the standard curing sample for 28 days. The cement lightweight soil is cracked and destroyed. Compared with the cement light soil, the geopolymer lightweight soil has a stronger ability to resist sodium sulfate erosion.
【作者单位】：东南大学岩土工程研究所;东南大学江苏省城市地下工程与环境安全重点实验室;
【基金】：国家自然科学基金(No.41472258,No.51278100) 江苏省杰出青年基金(No.BK2012022)
【分类号】：TU528

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