CAJ | 학술논문

硅化法是湿陷性黄土地基处理的主要化学方法之一,为了提高固化效果需要对水玻璃溶液进行改性.对温度改性水玻璃溶液固化黄土进行了试验研究,并通过化学组成和矿物成分分析、微观结构分析探讨了温度改性水玻璃固化黄土的机制.试验结果表明:在20~80℃范围内,随着温度的升高,水玻璃固化黄土的强度有明显提高;X射线衍射图谱中部分矿物衍射强度降低并出现密集低矮的非晶质物相峰群;SEM图像显示随着温度的升高凝胶薄膜增多;MIP(压汞试验)数据显示,随着温度的升高,孔隙表面积增大.水玻璃溶液固化黄土的强度随温度增加的机制在于:生成的非晶质物相和凝胶薄膜随着温度的升高而增加,促使最可几孔径的减小和小孔隙的增多,强化了骨架颗粒的连接强度,并将骨架颗粒黏结成为一个空间网状整体,从而改善了土体的强度.
규화법시습함성황토지기처리적주요화학방법지일,위료제고고화효과수요대수파리용액진행개성.대온도개성수파리용액고화황토진행료시험연구,병통과화학조성화광물성분분석、미관결구분석탐토료온도개성수파리고화황토적궤제.시험결과표명:재20~80℃범위내,수착온도적승고,수파리고화황토적강도유명현제고;X사선연사도보중부분광물연사강도강저병출현밀집저왜적비정질물상봉군;SEM도상현시수착온도적승고응효박막증다;MIP(압홍시험)수거현시,수착온도적승고,공극표면적증대.수파리용액고화황토적강도수온도증가적궤제재우:생성적비정질물상화응효박막수착온도적승고이증가,촉사최가궤공경적감소화소공극적증다,강화료골가과립적련접강도,병장골가과립점결성위일개공간망상정체,종이개선료토체적강도.
@@@@Silicifrcation is one of the chemical methods of collapsible loess treatment. For better silicification effect, sodium silicate is modified by various methods. The mechanism of loess reinforced by temperature modified sodium silicate is studied. The physical component such as chemical composition and mineral composition, microstructure are tested and analyzed by carrying out X-ray diffraction (XRD), scanning electron microscope(SEM) and mercury intrusion porosimetry (MIP). The results show that the mechanical strength of loess is improved obviously with the temperature of sodium silicate increasing in the temperature range of 20~80℃. Diffraction intensity of parts of the mineral is reducing in the X-ray diffraction patterns;and low density amorphous phase peak groups appeared. The SEM images show that the gel films increased with the temperature of sodium silicate increasing. MIP data show that surface area of pores increased with the temperature increasing. The findings indicate that the increased amorphous phase and the gel films caused to decreased most probable pore size and increased small pores. The mechanism of loess reinforced by temperature modified sodium silicate is due to reinforcement of the bond strength of cement in microstructure and formation of three-dimensional networks of frame.