Investigation on Loess Soil Water Characteristic as Influenced by SAPs

In order to search the rule of SAPs' activity on loess soil,centrifuge method was used to measure soil water characteristic curve on different concentration of SAPs.Influence of soil moisture on different SAPs with various concentrations,influence of soil absorbing capacity and efficiency on different SAPs,and comparison of the SAPs were analyzed systematically.The results show that:(1) Concentration had obvious effects on soil saturation moisture,and 0.75% was a boundary;(2) Soil moisture rised with the increase of SAPs' concentration,and declined with the increase of soil potential.The effect in low-suction period(0.01～0.8 MPa) was stronger than that of high-suction period(0.8～1.5 MPa),especially in 0.01～0.05 MPa;(3) From the experimental results: STOCKOSORBTM SAP was the best,and AQUASORBTM SAP was the second,and ACRYLATE SAP was the worst.The strongpoint of STOCKOSORBTM SAP was embodied in two aspects: the amount and efficiency of absorbing available water.