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Experimental Study on Physical and Mechanical Properties of Gypsum Rock During High-Temperature Dehydration–Hydration Expansion
Natural Resources Research ( IF 5.4 ) Pub Date : 2021-01-05 , DOI: 10.1007/s11053-020-09796-z
Sijiang Wei , Yushun Yang , Chongbang Xu , Meng Wang , Wenlong Shen , Chengdong Su

In order to study the physical and mechanical properties of gypsum rock samples in three states (natural, high-temperature dehydration and hydration time), natural gypsum rock was put into high-temperature condition of 220°C for dehydration treatment, and then the high-temperature dehydrated gypsum rock was treated with different hydration time, and the gypsum rock samples in three states were subjected to ultrasonic test, density test and uniaxial compression test. The results show that the main components of natural gypsum minerals were gypsum dihydrate (71%), dolomite (27%) and potassium chloride (2%). The hydration of high-temperature dehydration samples was an extremely complex physical and chemical process. Hydration had a significant strengthening effect on gypsum rock, and the weak surface of the structure had a significant weakening effect on it during the hydration process. As hydration time increased, the apparent density increased gradually and the longitudinal wave velocity increased. The peak strength of the sample decreased first and then increased, and it generally had a logarithmic relationship with hydration time. The peak strain decreased first and then increased, then decreased and fluctuated, and the elastic modulus first increased and then decreased and then increased again. The expansion rate and limited expansion force of the sample increased with increase in hydration time. After a certain hydration time, the expansion rate of the sample tended to be stable, while the limited expansion force began to decrease slowly after reaching the maximum value.



中文翻译:

石膏高温高温水化膨胀过程中物理力学性能的试验研究

为了研究石膏岩样品在三种状态(自然,高温脱水和水化时间)下的物理力学性能,将天然石膏岩置于220°C的高温条件下进行脱水处理,然后进行高温处理。对高温脱水石膏岩进行不同的水化时间处理,对三种状态的石膏岩样进行超声,密度试验和单轴压缩试验。结果表明,天然石膏矿物的主要成分为二水合石膏(71%),白云石(27%)和氯化钾(2%)。高温脱水样品的水合作用是极其复杂的物理和化学过程。水合对石膏岩石具有明显的增强作用,在水化过程中,结构的弱表面对其具有明显的弱化作用。随着水化时间的增加,表观密度逐渐增加,纵波速度增加。样品的峰强度先降低然后升高,并且通常与水合时间呈对数关系。峰值应变先下降然后上升,然后下降并波动,弹性模量先上升然后下降然后再上升。样品的膨胀率和有限的膨胀力随着水合时间的增加而增加。在一定的水合时间后,样品的膨胀率趋于稳定,而有限的膨胀力在达到最大值后开始缓慢下降。随着水化时间的增加,表观密度逐渐增加,纵波速度增加。样品的峰强度先降低然后升高,并且通常与水合时间呈对数关系。峰值应变先下降然后上升,然后下降并波动,弹性模量先上升然后下降然后再上升。样品的膨胀率和有限的膨胀力随着水合时间的增加而增加。在一定的水合时间后,样品的膨胀率趋于稳定,而有限的膨胀力在达到最大值后开始缓慢下降。随着水化时间的增加,表观密度逐渐增加,纵波速度增加。样品的峰强度先降低然后升高,并且通常与水合时间呈对数关系。峰值应变先下降然后上升,然后下降并波动,弹性模量先上升然后下降然后再上升。样品的膨胀率和有限的膨胀力随着水合时间的增加而增加。在一定的水合时间后,样品的膨胀率趋于稳定,而有限的膨胀力在达到最大值后开始缓慢下降。样品的峰强度先降低然后升高,并且通常与水合时间呈对数关系。峰值应变先下降然后上升,然后下降并波动,弹性模量先上升然后下降然后再上升。样品的膨胀率和有限的膨胀力随着水合时间的增加而增加。在一定的水合时间后,样品的膨胀率趋于稳定,而有限的膨胀力在达到最大值后开始缓慢下降。样品的峰强度先降低然后升高,并且通常与水合时间呈对数关系。峰值应变先下降然后上升,然后下降并波动,弹性模量先上升然后下降然后再上升。样品的膨胀率和有限的膨胀力随着水合时间的增加而增加。在一定的水合时间后,样品的膨胀率趋于稳定,而有限的膨胀力在达到最大值后开始缓慢下降。样品的膨胀率和有限的膨胀力随着水合时间的增加而增加。在一定的水合时间后,样品的膨胀率趋于稳定,而有限的膨胀力在达到最大值后开始缓慢下降。样品的膨胀率和有限的膨胀力随着水合时间的增加而增加。在一定的水合时间后,样品的膨胀率趋于稳定,而有限的膨胀力在达到最大值后开始缓慢下降。

更新日期:2021-01-05
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