The Phase Transformation of Recycling Concrete in Recalcination
In this paper,the artificial aggregates were prepared by limestone and industrial wastes in accordance with the ratio of cement raw meal,to obtain the recycling concrete replacing natural aggregates.Cement clinker could be regenerated by these recycling concrete and the aim of recycling could be realized.After these concrete was cured for 90 days,then was crushed and grinded,the phase transformation of recycling concrete in recalcination would been studied by XRD and so on.The experimental results showed that the composition of the recycling concrete met the demand of clinker modulus and C2S,C3S,C4AF,C3A were well crystallized at 1400 ℃.So these recycling concrete could be directly calcined.The calcium hydroxide dehydrated around the temperature of 500℃.The calcium silicate hydrate was dehydrated gradually between the temperature of 400℃ and 1000℃.At the same time,C2S crystallized during the temperature range.C4AF and C3A stared to crystallize around the temperature of 1000℃.Due to the composition of these concrete was complex,the lowest eutectic temperature dropped.C3S started to crystallize around the temperature of 1250℃ and the best crystallization was achieved at the temperature of 1400℃.
Industrial wastes Recycling concrete Recalcination Phase transformation
ZhiGang Zhang Zonghui Zhou Decheng Zhang Xin Cheng
Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials,Engineering School of Materials Science and Engineering, University of Jinan, Jinan 250022, China
国际会议
the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))
太原
英文
175-179
2012-07-13（万方平台首次上网日期，不代表论文的发表时间）