后期处理工艺对快速固化水泥刨花板性能的影响

Effects of final treatment techniques on the properties of fast curing cement particle board

以钻天杨Populus nigravar.italica刨花为原料,42.5强度等级的普通硅酸盐水泥为胶黏剂,硅酸钠为快速固化添加剂,通过热压制板的方法,研究了水泥刨花板坯卸出压机后的后期处理工艺对板性能的影响。结果表明:①用热压法制水泥刨花板时,板坯卸出压机后的直接蒸养可大大加速水泥的水化过程。②在温度80℃,相对湿度80%的条件下,8 h直接蒸养的效果相当于8 d的自然养护,可大大缩短生产周期。③自然养护8 d后进行蒸养,对水泥刨花板物理力学性能的影响不显著,说明经8 d的自然养护,水泥水化已基本完成,而后水化进行缓慢,蒸养不能加速这一过程。④蒸养的工艺条件为温度80℃,空气相对湿度80%,蒸养时间8,16,24 h。此工艺条件有待进一步优化。

The effects of final treatment techniques on the properties of hot pressing cement particle board （CPB） mat were studied with poplar particles of certain size as mw materials, number 42.5 level common silicate cement as glues and Na2SiO3 as fast curing additives. The results were ： 1） The direct steam curing after the unloading of hot pressing CPB could greatly accelerate thc hydration of cement. 2） The eight hours＇ steam curing with 80℃ temperature and 80% relative humidity equalled to eight days＇ natural curing, which could greatly reduce the production time. 3） The offects of steam curing after eight days＇ natural curing having no obvious effects on the properties of CPB showed that the hydration of cement mainly completed after eight days natural curing so steam curing could not accelerate the cement hydration because the afterwards hydration was slowly carried on. 4） The factors of steam curing were ： temperature of 80℃, air relative humidity of 80% and time of 8, 16 and 24 h. The factors need further optimization. [ Ch, 5 tab. 9 ref. ]