Estimation of gypsum hemihydrate content in recycled gypsums derived from gypsum boards
Estimation of gypsum hemihydrate content in recycled gypsums derived from gypsum boards
复制标题
石膏板再生石膏中半水石膏含量的估算
DOI：
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发表时间：
2014
影响因子：
3.1
通讯作者：
M. Yamada
中科院分区：
文献类型：
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作者：
S. Inazumi;H. Sano;M. Yamada
为了利用废弃石膏板中的再生石膏（石膏板废料）作为土工材料，本文对再生石膏和试剂石膏的热行为进行了研究。此外，还研究了判断再生石膏质量的简单密度测量方法，以确定半水石膏含量。结果发现，在90℃加热条件下，二水石膏转变为半水石膏，在120℃加热24h时，半水石膏转变为硬石膏。本文澄清了以下内容。有了水泥密度测量方法，可以测量再生石膏的密度；该密度取决于再生石膏的干燥条件；密度测定方法适合估算再生石膏中半水石膏的含量。此外，通过根据再生石膏的密度值计算半水石膏含量，发现基于密度的质量控制方法是有效的。
In order to utilize reclaimed gypsums (gypsum board waste) derived from waste plasterboards as geo-materials, thermal behaviors of the reclaimed gypsums and reagent gypsum are investigated in this paper. Furthermore, simple density measuring method of judging quality of the reclaimed gypsums is examined to determine the gypsum hemihydrate content. As the results, it was found that the dihydrate gypsum is changed into the hemihydrate gypsum under thermal condition of 90 °C and the hemihydrate gypsum is changed into anhydrite under that of 120 °C with heating of 24 h. The followings were clarified in this paper. The cement density measuring method was available in order to measure the density of reclaimed gypsums; that density depended on the drying conditions of the reclaimed gypsums; and the density measuring method was appropriate to estimate the gypsum hemihydrate content in reclaimed gypsums. Furthermore, it was found that the quality control method based on the density was effective by calculating the gypsum hemihydrate content from the density values of reclaimed gypsums.