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采用铅笔硬度法对泡沫混凝土粉化程度进行了表征,并利用水分蒸发率、SEM、DTG/TG等方法分析了产生粉化的原因。结果表明,泡沫混凝土的铅笔硬度值小于6B时,表明其已产生粉化;低密度泡沫混凝土(小于500kg/m3)容易产生粉化;泡沫混凝土密度越小,早期水分蒸发率越大,24h水分蒸发率超过40%以上时,产生粉化,水分早期快速蒸发是造成泡沫混凝土粉化的原因。泡沫混凝土早期失水使结构疏松,导致CO2更容易侵入而产生碳化,通过分析硬化浆体的CaCO3含量可以分析泡沫混凝土的粉化程度。
The degree of powdering of foam concrete was characterized by pencil hardness method. The reason of powdering was analyzed by the methods of moisture evaporation, SEM, DTG / TG and so on. The results show that when the pencil hardness of foam concrete is less than 6B, it shows that it has been pulverized. The low density foam concrete (less than 500kg / m3) is prone to pulverization. The smaller the foam concrete density is, the earlier the moisture evaporation rate is. Evaporation rate of more than 40%, resulting in chalking, early rapid evaporation of water is the cause of the foam concrete. Early loss of foam concrete makes the structure loose, resulting in CO2 more easily invaded and carbonized. The degree of powdering of the foam concrete can be analyzed by analyzing the CaCO3 content of the hardened slurry.