SY土壤固化剂对砂质粉土工程性能的影响研究

采用SY土壤固化剂,以砂质粉土为固结对象,分别在水泥含量10%、15%和20%,固化剂掺量为0.5%、1.0%、1.5%和2.0%时,制成最大干密度的试样,进行了3、7、14和28 d无侧限抗压强度试验,28 d劈裂抗拉强度试验,水泥含量20%时,1.0%、1.5%和2.0%固化剂掺量时的抗渗试验,以及水泥含量20%、1.5%固化剂掺量时的冻融循环试验。结果表明,SY固化剂能显著提高砂质粉土的力学性能、抗渗、抗冻性能;在同一个固化剂掺量下,其力学性能、抗渗、抗冻性能随着水泥含量的增加而提高;固化剂掺量、水泥含量与土壤含量三者之间存在协调性。SEM测试和机理分析表明,SY土壤固化剂生成的大量二氧化硅凝胶和微膨胀的钙矾石晶体,使内部结构更加致密,从而提高了砂质粉土的宏观力学性能和抗渗、抗冻性能,可用于渠道防渗工程中。

Effects of Engineering Properties of Sandy Soil Stabilized by SY Soil Stabilizer

To investigate engineering properties of sandy soil,a stabilizer named SY was used in this investigation.Unconfined compressive strength,splitting tensile strength,resistance to permeability,freeze-thaw cycles tests were carried out by samples with maximum dry density.The results present that all the engineering properties of the stabilized soil samples are improved significantly,and SY stabilizer,cement and sandy soil have coordination.From SEM pictures and mechanism analyzes,it can proved that for sandy soil which has more pores in micro-structure,AFt Crystals,SiO2 gel and C-S-H gel filled pores well which makes the micro-structure more density and the expansion of AFt Crystals,they all benefit macro-engineering properties of stabilized sandy soil for canal seepage.