Study On Cement-based Straw Fiber Composites

As natural resources gradually exhaust, the demand for building energy efficiency gets higher and higher nowadays. Backward rural areas and remote countryside mainly use traditional building materials, and the disadvantages of which are high energy consumption and poor thermal insulation. The new type of building materials for wall made with natural straw not only reduces rural building energy consumption, but also decreases the hardness of issue of straw burning.In the paper, Portland cement, as binding material, is composited with straw fiber to make cement-based straw fiber composite. A optimal mix was searched out through plenty of experiments on physical and mechanical properties and thermal performance of composites. To be exact, soak straw fiber with dipping liquid in concentration of 4%, for 12 h before hand, and then carry out surface modification treatment with modifier in concentration of 1%. Every performance of the cement-based straw fiber composite in the mix proportion, that the dosage of straw fiber is the 15% in weight of cement, while the dosage of accelerator is 10% of cement and water-cement ratio is 0.60, proves to be good: the bulk density of composite material is 1.172g/cm3; and water absorption is 9.82%; the compressive strength of 28 d is 6.47MPa; coefficient of heat conductivity is 0.203W/m·k; the fire residence level comes up to over B1.Cement-based straw fiber composite, as a new type of building materials for wall, has the advantages of light weight, proper strength, low heat conductivity, good fire residence, low cost of production, and also, it is easy to draw on local materials and popularize and apply in rural areas. Hence, it has good economic efficiency and social benefits.