东北大学学报（自然科学版）
東北大學學報（自然科學版）
동북대학학보（자연과학판）
Journal of Northeastern University (Natural Science)
2015年
12期
1766-1770
,共5页
木质素%粉土%物理性质%强度特性%电阻率
木質素%粉土%物理性質%彊度特性%電阻率
목질소%분토%물이성질%강도특성%전조솔
lignin%silt%physical properties%strength characteristic%electrical resistivity
将工业副产品木质素应用于粉土改良。通过界限含水率、颗分、击实、无侧限抗压强度和电阻率等室内试验,对素土及掺木质素改良土的基本物理力学性质、pH 值和电学特性等进行对比研究,明确改良土的基本工程特性变化规律和改良效果,并采用扫描电子显微镜(SEM)对土体微观结构变化进行对比分析,阐述了木质素与土体的相互作用机理。试验结果表明：木质素可有效改善粉土的颗粒级配,降低土体的塑性指数；改良后粉土的最大干密度增加,最佳含水率减小,同时干密度对含水率变化的敏感性增强；改良土的无侧限抗压强度优于素土,pH 值低于10,龄期和含水率对强度影响显著,对 pH 值无明显影响；胶结物质填充孔隙并联结土颗粒,改良土微观结构更为稳定。这说明木质素可有效改善粉土的基本工程特性。
將工業副產品木質素應用于粉土改良。通過界限含水率、顆分、擊實、無側限抗壓彊度和電阻率等室內試驗,對素土及摻木質素改良土的基本物理力學性質、pH 值和電學特性等進行對比研究,明確改良土的基本工程特性變化規律和改良效果,併採用掃描電子顯微鏡(SEM)對土體微觀結構變化進行對比分析,闡述瞭木質素與土體的相互作用機理。試驗結果錶明：木質素可有效改善粉土的顆粒級配,降低土體的塑性指數；改良後粉土的最大榦密度增加,最佳含水率減小,同時榦密度對含水率變化的敏感性增彊；改良土的無側限抗壓彊度優于素土,pH 值低于10,齡期和含水率對彊度影響顯著,對 pH 值無明顯影響；膠結物質填充孔隙併聯結土顆粒,改良土微觀結構更為穩定。這說明木質素可有效改善粉土的基本工程特性。
장공업부산품목질소응용우분토개량。통과계한함수솔、과분、격실、무측한항압강도화전조솔등실내시험,대소토급참목질소개량토적기본물리역학성질、pH 치화전학특성등진행대비연구,명학개량토적기본공정특성변화규률화개량효과,병채용소묘전자현미경(SEM)대토체미관결구변화진행대비분석,천술료목질소여토체적상호작용궤리。시험결과표명：목질소가유효개선분토적과립급배,강저토체적소성지수；개량후분토적최대간밀도증가,최가함수솔감소,동시간밀도대함수솔변화적민감성증강；개량토적무측한항압강도우우소토,pH 치저우10,령기화함수솔대강도영향현저,대 pH 치무명현영향；효결물질전충공극병련결토과립,개량토미관결구경위은정。저설명목질소가유효개선분토적기본공정특성。
The lignin,an industrial by-product,is utilized to improve the silt.A series of laboratory tests on moisture content, particle size distribution, compaction, unconfined compression strength and electrical resistivity are carried out to study the mechanical and physical properties of natural silt and lignin-improved silt.The pH value and electrical characteristics of improved soil are also investigated.Scanning electron microscopy (SEM)is used to analyze the variations of soils microstructure, and the stabilization mechanism of lignin-treated silt is preliminarily discussed.The results indicate that lignin can effectively improve the particle size distribution and reduce the plastic index of soil.As to improved silt,maximum dry density increases,the optimum moisture content decreases,while the change of dry density with moisture content is enhanced.The lignin-treated silt has greater strength performance than the natural silt in terms of unconfined compression strength and all the improved soils have a pH value lower than 10.Curing time and moisture content have a significant impact on unconfined compression strength,but little effect on pH value.The pores of soils are filled and particles are connected with cementing material,then a more stable soil structure was formed.It is shown that adding lignin can successfully improve the basic engineering properties of silt.
