氯氧镁水泥基秸秆轻质复合材料的研究

Research on the lightw eight composite materials of magnesium oxychloride cement-cornstalk

以氯氧镁水泥和玉米秸秆纤维为主要原材料,从氯氧镁水泥基本组成、氯氧镁水泥改性、秸秆纤维掺量对复合材料性能影响、H2O2掺量对复合材料性能影响等角度开展研究。研究结果表明:当磷酸掺量为0.6%时,可以解决氯氧镁水泥后期强度倒缩的问题,28 d抗压强度达到98.0 MPa,并使其耐水性提高22%;当秸秆掺量体积比为1.00时,拌合物具有较好的工作性,试样28 d折压比达到0.26,试样抗裂性增强,柔韧性提高;当H2O2掺量为2.5%时,试样28 d抗压强度为3.7 MPa,抗折强度为1.8 MPa,折压比达到0.49,表观密度为559 kg/m3,导热系数为0.122 W(/m·K)。

Magnesium oxychloride cement and cornstalk fibers were used as the main raw materials in this paper.The effects of basic composition of MOC,modification of MOC,cornstalk fibers content on the properties of composite materials,and the influence of H2 O2 content on the properties of composite materials were studied.The results show that when the amount of phosphoric acid is 0.6%,it can solve the problem of shrinkage of MOC at later stage,and the compressive strength of 28 d reaches 98.0 MPa,and its water resistance is increased by 22%;When the volume ratio of cornstalk fibers reaching 1.00,the workability of mixtures is good,the crack resistance and the toughness of the test blocks is improved,and the 28 d bend-press ratio is 0.26;As addition of H2 O2 is 2.5%,the 28 d compressive strength reaches 3.7 MPa,the bending strength reaches 1.8 MPa,the bend-press ratio reaches 0.49,the apparent density reduces to 559 kg/m3 and the thermal conductivity is 0.122 W(/m/K).