Performance of Low-Volume Roads with Weighing Course of Silty Sand Modified with Rice Husk Ash and Lime - ScienceDirect

Posted May 07, 2017

Rice husk ash (RHA) is a by-product of rice milling. Its use as soil stabilizer is a way to replace the final disposal with environmental benefit. However, RHA is not cementitious itself but when mixed with lime forms cements which improve the soil properties. A study of the performance of a silty sand modified with RHA and lime as the low-volume roads was conducted through two full-scale test sections with different pavements built in Artigas, northern Uruguay. The alkaline reactivity of RHA is low because the husk burning is not controlled. The soil-RHA-lime mix was designed according to the Thompson's Method. The pavement test sections were monitored through deflection measurements by Benkelman beam and observations of surface condition. The deflections decreased over time in both test sections due to the development of cementation of the study materials. After one year, the dust emission was reduced, the wet skid resistance of pavement surfaces improved and there was not rutting. The RHA and lime is an alternative to improve the condition of low-volume roads and to replace the final disposal of RHA, With environmental, social and economic benefits.