Analysis of water stability and microscopic mechanism of rice husk ash ground polymer solidified loess
[Objective]In order to solve the engineering characteristics of loess,such as large pores,low strength and poor water resistance,[Methods]using environmentally friendly solid waste material rice husk ash to improve loess,the solidification effect and mechanism of rice husk ash geopolymer on loess were analyzed and evaluated from the mechanical and microscopic levels through compaction tests,unconfined compressive strength tests,disintegration tests,and scanning electron microscopy tests with different dosages of rice husk ash and NaOH excitation.[Results]The results show that with the increase of rice husk ash con-tent,the maximum dry density of solidified soil decreases and the optimal moisture content increases.Rice husk ash has in-creased the unconfined compressive strength of loess by 87.4％.Alkali activated rice husk ash has a greater improvement effect,with a maximum increase of 2.36 times.There is an optimal dosage of 7.5％for rice husk ash and 10％for NaOH;Rice husk ash geopolymer can effectively improve the water resistance of loess.When the rice husk ash content is 7.5％and NaOH content is 10％,the disintegration amount is 20％of the loess disintegration amount;The rice husk ash geopolymer reduced the fractal dimension of the micro pore morphology distribution of the soil from 1.554 to 1.062 and 1.004,significantly reducing the pore area and pore connectivity of the soil.[Conclusion]The result show that the addition of rice husk ash geopolymer can significant-ly reduce the number,size,and connectivity of pores in loess,effectively improve the compactness and water resistance of loess,and have many advantages such as low cost and green environmental protection.
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