功能组分对固化土早期强度的影响研究

发布时间：2019-03-29 13:37

【摘要】：根据红黏土的特点,为解决其固化土早期强度低、水稳定性差等问题,提出了使用膨胀组分、早强组分、减薄双电层结构组分、防水组分等功能组分来提高硫铝酸盐水泥固化土的早期强度。通过单掺试验,优选出了硬脂酸铝、三乙醇胺、Fe(NO_3)_3和石膏作为土壤固化材料的功能组分,并通过正交试验,确定了功能组分的最优配方。在该配方下,固化土的7d无侧限抗压强度达到了8.60 MPa。利用XRD、SEM等微观表征,对比分析了掺入功能组分前、后固化土的矿物组成以及微观形貌结构变化,结果表明:适量的功能组分掺入有利于高强、难溶具有膨胀性的矿物晶体生成,从而提高固化土早期强度,但功能组分掺量过高,由于矿物晶体过多膨胀作用以及憎水膜的阻碍作用,改变了固化土的联结方式,使其早期强度降低。
[Abstract]:According to the characteristics of red clay, in order to solve the problems of low early strength and poor water stability of the solidified soil, the use of expansion component, early strength component and thin double layer structure component is put forward. Waterproof components and other functional components to improve the early strength of sulphoaluminate cement solidified soil. In this paper, aluminum stearate, triethanolamine, Fe (NO_3) _ 3 and gypsum were selected as functional components of soil curing materials by single doping test, and the optimum formula of functional components was determined by orthogonal test. Under this formula, the 7 d unconfined compressive strength of solidified soil can reach 8.60 MPa.. The mineral composition and microstructure change of solidified soil before and after adding functional components were analyzed by XRD,SEM and other micro-characterization. The results showed that proper addition of functional components was beneficial to high strength, and the mineral composition and microstructure of solidified soil before and after the addition of functional components were compared and analyzed. The formation of insoluble expansive mineral crystals can improve the early strength of solidified soil, but the addition of functional components is too high. Due to the excessive expansion of mineral crystals and the hindrance of water-repellent film, the bonding mode of solidified soil is changed. Reduce its early strength.
【作者单位】：中国人民解放军后勤工程学院化学与材料工程系;
【基金】：军队后勤科研计划重点项目(No.BY211C016)~~
【分类号】：TU472

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