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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。
According to the characteristics of red clay, in order to solve the problems of low initial strength and poor water stability of hardened soil, some functional components such as expansive component, early strength component, thinning double-layer structure component and waterproof component were proposed Improve the early strength of sulphoaluminate cement soil. Through the single-blending test, aluminum stearate, triethanolamine, Fe (NO_3) _3 and gypsum were selected as the functional components of the soil solidification materials. The optimum formulation of the functional components was determined by orthogonal test. Under this formula, the unconfined compressive strength of 7d at curing time reached 8.60 MPa. The microstructure and morphological changes of the soil before and after the incorporation of the functional components were analyzed by XRD, SEM and other micro-morphologies. The results showed that proper incorporation of functional components was beneficial to high strength and poor solubility Of the mineral crystals, thereby increasing the early strength of hardened soil, but the content of functional components is too high, due to the excessive expansion of mineral crystals and the blocking effect of hydrophobic membranes, changing the way of bonding of hardened soil to reduce its early strength.