摘要
以含5%腐殖酸的南沙重塑软土为研究对象,在水泥掺量为15%的基础上,分别添加石膏、矿渣、氢氧化钠、硫酸钠和萘系高效减水剂五种外掺剂,通过无侧限抗压强度试验和扫描电镜(SEM)分别研究不同外掺剂作用下固化软土强度特性及微观结构特征。试验结果表明:在水泥掺量为15%的基础上,固化效果最好的是外掺5%的石膏,其28 d强度达到0. 8 MPa,相比单掺水泥提高了2. 58倍,随后依次分别是外掺3%硫酸钠、0. 8%氢氧化钠、6%矿渣、1. 5%减水剂。SEM试验结果显示:在水泥基中掺入外掺剂后,南沙水泥土的孔隙度减小,其中外掺石膏孔隙最少,胶结最均匀。不同外掺剂固化后的南沙有机质软土28 d强度均高于0. 4 MPa。
Guangzhou Nansha remolded organic soft soil containing 5%humic acid was solidified with the mixture of 15%cement and another admixture,including gypsum,slag,sodium hydroxide,sodium sulfate,and naphthalene high efficiency water reducing agent.The strength and microstructure characteristics of cement-soil with different admixtures were studied by unconfined compressive strength test and SEM.The results showed that the curing efficiency of the soft soil cured with 5%gypsum and 15%cement was the best,followed was with 3%sodium sulfate,0.8%sodium hydroxide,6%slag and 1.5%water reducer.The unconfined compressive strength of cement-soil in 28 d cured with 5%gypsum and 15%cement reached 0.8 MPa,which was 2.58 times higher than that cured with single cement.The porosity of Nansha cement soil in the SEM images decreased after incorporation of other admixtures,which was the lowest in all the cement-solis solidified with 5%gypsum.The 28-day strengths of Nansha organic soft soil reinforced by different admixtures were higher than 0.4 MPa.
作者
梁仕华
林坚鹏
龚星
罗祺
丘伟杰
冯德銮
LIANG Shihua;LIN Jianpeng;GONG Xing;LUO Qi;QIU Weijie;FENG Deluan(School of Civil and Transportation Engineering,Guangdong University of Technology,Guangzhou 510006,China;Urban Planning and Architectural Design Institute of Hunan City University,Yiyang 413002,China)
出处
《工业建筑》
CSCD
北大核心
2019年第2期93-97,共5页
Industrial Construction
关键词
有机质软土
外掺剂
无侧限抗压强度
扫描电镜
organic soft soil
admixture
unconfined compressive strength
scanning electron microscope
