脱硫建筑石膏耐水性能研究

Water Resistance Property of FGD Building Gypsum

以脱硫建筑石膏为主要胶凝材料,研究无机改性剂粉煤灰和水泥、复合激发剂、有机硅防水剂对脱硫建筑石膏耐水性的影响。实验结果表明,单掺粉煤灰和水泥对脱硫建筑石膏体系的耐水性提高幅度不大。复掺粉煤灰、水泥和复合激发剂后,可以获得6 MPa以上的抗折强度,22 MPa以上的抗压强度,0.6以上的抗折软化系数,但抗压软化系数和吸水率与单掺体系相比差别不大。在复掺最优配方的基础上添加有机硅防水剂,在防水剂掺量为0.8%时,其复合脱硫石膏试块的抗折软化系数0.756,抗压软化系数0.791,分别提高了64.3%和108.1%,吸水率仅为3.7%,显著地提高了脱硫石膏的防水性能。

The effects of fly ash, cement, compound activator and organosilicon waterproofing agent on the water resistance of flue gas desulphurization （ FGD） building gypsum were studied. The research results show that there is no great improvement on the water resistance of FGD building gypsum when fly ash and cement are added to the system respectively. However, the flexural strength of the sample is above 6 MPa, the compressive strength is above 22 MPa and the flexural softening coefficient is above 0.6 when fly ash, cements and compound activator are added simultaneously to FGD building gypsum system. Furthermore, the organosilicon waterproofing agent is added to the mixture system of fly ash, cements, compound activator and FGD building gypsum, the flexural softening coefficient of the sample is 0. 756 and the compressive softening coefficient is 0. 791 with add 0. 8% waterproof agent, which are 64.3% and 108. 1% higher than that of pure FGD building gypsum, respectively, Water absorption rate is only 3.7%. It is indicated that the addition of self-made waterproof agent can significantly improve the properties of PEG building gypsum.