Study on the Effect of Agent on Mechanical Properties of Corn Straw Cement-Based Biomass Materials

This paper is on the issues of the retarding of Portland Cement, low intensity of the products and poor binding statement between corn straw skin and cementing materials caused by corn straw dissolution. By adding different amount of surface wrap agent and coagulant early-strength agent, compressive strength and softening coefficient of corn straw cement-based biomass materials are tested in order to study the effects of chemical additives on the mechanical strength and water endurance. The results show that the growth rate of early strength of corn straw cement-based biomass materials can reach more than 3 times, the 28d compressive strength reaches over 8.5 MPa and the softening coefficient is over 0.85, which can meet the request of wallboard standards. For surface wrap agent, the 28d compressive strength of corn straw cement-based biomass materials increases with the increasing of the polyvinyl acetate copolymer(PVAc), while the water endurance is superior to the biomass materials containing water glass. For the coagulant early strength agent, CaCl₂ has the best coagulant effect and FeCl₃ shows the best water endurance.