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Effect of curing humidity on compressive strength of gypsum cemented similar materials

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Document pages: 12 pages

Abstract: Similarity simulation test is widely used in geotechnical engineering and mining engineering. However, the systematic error caused by the unified standard maintenance procedure is underestimated to some extent. In this study, 140 samples of gypsum cemented similar materials were selected to study their curing process at different relative humidity (10 - 15 , 40 , 60 and 80 , respectively). The correlation between microstructure and macro mechanical strength during curing was detected by SEM and XRD. Our results show that the acicular phase of similar materials begins to develop by crossing each other in the early stage of hydration process, and finally transforms into sheet phase. The increase of humidity may inhibit th development of needle-like phases; thus the compressive strength changes more smoothly, and the time required for the material strength to reach the peak value will be prolonged. The peak strength decreases along with the increase of humidity while the humidity is higher than 40 ; however, the reverse tendency was observed if the humidity was lower than 40 . Finally, we noticed that the material strength usually reaches the peak value when the water content continuously reduces and tends towards stability. Based on the above observation, a curing method determination model and experimental strength predication method for gypsum-cemented similar materials were proposed.

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