谷歌浏览器插件
订阅小程序
在清言上使用

A Novel Bio-Carbonation Method of Reactive Magnesia with Urea Pre-Hydrolysis for Geomaterial Stabilisation

GEOTECHNIQUE(2023)

引用 0|浏览25
暂无评分
摘要
This study proposes a novel bio-carbonation method of reactive magnesia cement (RMC) with urea pre-hydrolysis for geomaterial stabilisation. Urea pre-hydrolysis in the bacterial solution before mixing with RMC produces more carbonate and ammonia, facilitating the RMC bio-carbonation to form more hydrated magnesia carbonates (HMCs), the dominant product that contributes to strength gain. The effect of urea pre-hydrolysis on the engineering performance of bio-carbonated samples is investigated through a series of RMC bio-carbonation geomaterial stabilisation tests with various pre-hydrolysis times and urea concentrations. The results show that the proposed method can improve material utilisation, enhance the RMC bio-carbonation reaction and promote geomaterial stabilisation performance. The relationships between the unconfined compressive strength (UCS) of bio-carbonated samples and the amount of HMCs are studied using a proposed indicator, the degree of carbonation (DC). However, the strength increment is not monotonically related to the amount of HMCs. The optimal pre-hydrolysis time is 6-12 h for bio-carbonated samples with UCS up to 3 & BULL;79 MPa, and the maximum UCS increase in the samples is up to 404 & BULL;42%. The critical DC values are in the range 0 & BULL;23-0 & BULL;36 with varying urea concentrations. The proposed method has implications for the design of bio-carbonated RMC in field applications.
更多
查看译文
关键词
bio geotechnics,carbonation,geomaterials stabilisation,magnesia,urea pre-hydrolysis
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要