关键词: 水泥固化土, 水泥掺入比, 养护龄期, 无侧限抗压强度, 寒区

Abstract: In order to spread and application of cement-stabilized soil to build heat retention houses and facility agriculture in cold regions, cement-stabilized soil has been prepared with Portland cement and typical silty soil, which is widely distributed in the Yellow River irrigation regions located in Inner Mongolia Autonomous Region. Two specimens, Φ50 mm×H50 mm and Φ39.1 mm×H80 mm, were made by static mechanical compaction and artificial layered compaction, respectively. A series of laboratory tests on the cement-stabilized soil were carried out, with consideration of the factors such as cement mixing ratio, curing age, specification, molding method and so on. The strength variation of cement-stabilized soil under different conditions were obtained by comparison. The result shows that the strength of cement-stabilized soil increases with cement mixing ratio and curing age, and among the strength of cement-stabilized soil, cement mixing ratio and age there is a relation following the space plane model. Partial regression analysis shows that cement mixing ratio contributes more than age. There is logarithmic relationship between the strengths of the specimens with different specification and molding method; the specimens from different specification and molding method have different effect. There are critical cement mixing ratio and critical curing age for Φ39.1 mm× H80 mm specimen. Once exceeding the two critical values, the strength growth rate would decrease.

Key words: cement-stabilized soil, cement mixing ratio, curing age, unconfined compressive strength, cold regions