Abstract:

Rice hull particle-cement composites（RHPC）were prepared from rice hull particles treated with the synthesized carboxymethylcellulose methyl methacrylate（CMC-g-PMMA）.The density, flexural property, surface topography, acoustics property, thermal insulation and fire retardant property of the RHPC composites were characterized. Results indicated that the samples made from CMC-g-PMMA modified rice hull particles had higher flexural strength and flexural modulus. When the content of rice hull particles was 20% and the content of CMC-g-PMMA was 1%, the value of flexural strength and flexural modulus of the composites changed respectively to 2.27 times and 2.71 times of the value of the sample contained 20% rice hull particles only. The acoustic absorptivity of the samples rose with increasing rice hull particles content when the testing frequency was below 2 000 Hz. The acoustic absorptivity of the samples with 40% rice hull particles was 0.67 at 1 000 Hz. RHPC composites are incombustible and well thermal insulated.

Key words: rice hull particles, cement, composites, properties