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原料配比对氯氧镁水泥稳定砾石土强度的影响研究

花匠小妙招
2025-09-28 23:20

原料配比对氯氧镁水泥稳定砾石土强度的影响研究(1. 中国科学院青海盐湖研究所中国科学院盐湖资源综合高效利用重点实验室，青海西宁 810008；2. 青海省盐湖资源化学重点实验室，青海西宁 810008；3. 中国科学院大学，北京 100049)Influence of raw material ratio of magnesium oxychloride cement on the compressive strength of solidified gravel soilLI Ying1，2，XIAO Xueying1，2，WEN Jing1，2，HUANG Qing1，2，3，CHANG Chenggong1，2， DONG Jinmei1，2，AN Shengxia1，2，3，ZHENG Weixin1，2(1. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources，Qinghai Institute of Salt Lakes，Chinese Academy of Sciences，Xining，Qinghai 810008，China；2. Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province，Xining，Qinghai 810008，China；3. University of Chinese Academy of Sciences，Beijing 100049，China)摘要图/表参考文献(34)相关文章(15) 摘要

氯氧镁水泥(MOC)具有抗冻性好和抵抗盐卤腐蚀的特点。研究MOC用作高寒盐碱地区公路工程无机结合料稳定材料的可行性，探讨原料配比对MOC稳定材料抗压强度的影响规律。制作试件，测定试件的无侧限抗压强度并分析物相组成。结果表明：卤水浓度较低(＜7.48%)时，活性MgO/MgCl2物质的量比(Mg/Cl比)较大，MOC稳定砾石土的主要水化产物是Mg(OH)2，无侧限抗压强度较低；卤水浓度升高(＞9.35%)时，Mg/Cl比降低，水化产物中出现3Mg(OH)2·MgCl2·8H2O(P318)和5Mg(OH)2·MgCl2·8H2O(P518)；主要水化产物为P318时无侧限抗压强度升高，主要水化产物为P518时无侧限抗压强度最高。轻烧镁粉掺量越大，水化产物越多，MOC稳定材料的无侧限抗压强度越大。MOC稳定材料的无侧限抗压强度决定于物相组成；卤水浓度、Mg/Cl比、轻烧镁粉掺量和卤水掺量是物相组成的重要影响因素。MOC稳定材料产生强度的机制包括活性MgO的水化作用及其水化产物的碳化作用、MgCl2·6H2O的结晶作用、填充作用、机械压实和离子交换作用。

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Magnesium oxychloride cement(MOC) had the inherent quality of good resistance to brine corrosion and frost. The objectives of this study were to investigate the feasibility of using MOC as a stabilizing material of highway pavement structure in saline and cold area as well as the influence of mix proportion of raw materials on the unconfined compressive strength(UCS) of gravel soil solidified by MOC. The UCS and the mineral composition of specimens were analyzed，respectively. The results show that the solidified gravel soil with a larger ratio of active MgO/MgCl2 (Mg/Cl) is mainly Mg(OH)2 in hydrated products and has the low UCS when the brine concentration is less than 7.48%. When the brine concentration increases，3Mg(OH)2·MgCl2·8H2O (P318) and 5Mg(OH)2·MgCl2·8H2O(P518) appear in the solidified mixture with the decreasing of Mg/Cl. The solidified gravel soil has higher UCS when the major hydrated product is P318 rather than Mg(OH)2，while the highest UCS is obtained when P518 appears. The greater the light-burn magnesia content，the more hydrated products and the higher UCS of solidified gravel soil. The UCS of MOC solidified gravel soil is determined by the mineral composition. The enhancement mechanisms of UCS of gravel soil solidified by MOC are attributed to the hydration of active MgO，carbonization of hydrated products，crystallization of MgCl2·6H2O，filling effect，mechanical compaction effect，and ion exchange effect.

Key words：building material magnesium oxychloride cement(MOC) solidified gravel soil mix proportion mineral composition unconfined compressive strength(UCS)