原料配比对氯氧镁水泥稳定砾石土强度的影响研究

doi:10.13722/j.cnki.jrme.2017.0191

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Abstract

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)

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0191 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS2/4158

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