The effect of an osmotic crystalline surface protectant agent on the performance of cement fly ash stabilized Aeolian sand bases

Abstract

This paper studies the use of cement fly ash to stabilize the graded gravel and the use of aeolian sand instead of fine aggregates in the design of mixture composition. Firstly, the effect of different cement-fly ash ratios on the aeolian sand bases was investigated, and then the synergistic effects of osmotic crystalline surface protectant (OCSP) and different cement-fly ash ratios on the mechanical properties and water-blocking properties of aeolian sand were analyzed. The results indicated that the optimal water content and maximum dry density of the mixture are increased and the unconfined compressive strength of the 7 d and 28 d both is downward by fly ash. The unconfined compressive strength of the aeolian sand base treated by OCSP was significantly improved, and the enhancement effect was more significant with the increase of cement content. The water absorption rate of each group of specimens increased rapidly during the first 10 hours of immersion., However, the water absorption rate of the specimen treated with OCSP was almost zero in the whole water absorption process after 10 hours.