氧化镁矿粉复配加固砂土的强度特性

打开文本图片集

中图分类号：TU441 文献标志码：A 文章编号：2096-6717（2025）03-0036-05

Strength characteristics of sand treated by magnesium oxide activated granulatedblast furnace

LU Jiayue1'，BAI Kun³， ZHANG Chengjun 4 ，YEQiang 1，2 （1.JiangsuResearch InstituteofBuilding Science Co.，Ltd.，Nanjing 21Ooo8，P.R.China；2.State KeyLaboratoryof High Performance in Civil Engineering Materials，Nanjing 210o8，P.R.China;3.China Railway 14th Bureau Group Corporation Limited，Jinan 25OlO1，P.R. China;4.China Railway 14th Bureau Group Mega Shield Construction Engineering Co.，Ltd.，Nanjing 21l899，P.R. China）

Abstract：Sandy soil isa common geotechnical material.To satisfy the mechanical and environmental requirements in engineering，the granulated blast furnace powder （GGBS）as a solid waste discharged by steel industry could replace cement as a soil curing agent. In this study，GGBS was used as curing agent and magnesium oxide （MgO ）was used as stimulating agent to reinforce the sand. The influence of curing durations （3，7，14，28，56 days） and the mixing amount of curing agents （8% ， 10% ， 12% ） as well as the amounts of magnesium oxide （0% ， 5% ， 10% ， 15% ， 20% ， 40% ） on the strength development were analyzed. The results showed that under the same amount of curing agent，the unconfined compressive strength （USC）of cemented sand has no obvious relation with curing age less than 7days.However，when the curing age was longer than 7 days，the longer the age period，the higher of the sand soil USC.Furthermore，the amount of curing agent is positively correlated with the unlimited compresive strength of sand.Finally，although magnesium oxide dosage could promote the improvement of the unlimited compresive strength，excessive magnesium oxide would inhibit the increase of the unlimited compressive strength in sand.

Keywords： magnesium oxide;sandy soil;unconfined compressive strength； granulated blast furnace powder

沿海和沿江地区分布较多砂土地基，为使砂土地基在静荷载作用下有足够的强度并改善砂王的不良工程特性，通常使用固化剂对砂土进行固化处理。（剩余7478字）