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Comparison of mechanical properties in high temperature and thermal treatment granite

Transactions of Nonferrous Metals Society of China 2016年第7期26卷 1926-1937页

作者：尹土兵舒荣华李夕兵王品刘希灵中南大学资源与安全工程学院长沙410083

Static mechanical experiments were carried out on granite after and under different temperatures using an electro-hydraulic and servo-controlled material testing machine with a heating device. Variations in obvious form, stress-strain curve, peak strength, peak strain and elastic modulus with temperature were analyzed and the essence of rock failure modes was explored. The results indicate that, compared with granite after the high temperature treatment, the brittle-ductile transition critical temperature is lower, the densification stage is longer, the elastic modulus is smaller and the damage is larger under high temperature. In addition, the peak stress is lower and the peak strain is greater, but both of them change more obviously with the increase of temperature compared with that of granite after the high temperature treatment. Furthermore, the failure modes of granite after the high temperature treatment and under high temperature show a remarkable difference. Below 100 ℃, the failure modes of granite under both conditions are the same, presenting splitting failure. However, after 100 ℃, the failure modes of granite after the high temperature treatment and under high temperature present splitting failure and shear failure, respectively.

关键词： granite thermal treatment high temperature effect static mechanical properties failure properties

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effects of slag fineness on durability of mortars

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第11期8卷 1725-1730页

作者： TOPU lker Bekir BLR Turhan Department of Civil Engineering Eski■ehir Osmangazi University Eski■ehir 26480 Turkey

In recent years, the usages of by-products and wastes in industry have become more important. The importance of the sustainable development is also of increasing. The utilizations of wastes, as mineral admixture or fine aggregate, reduce the consumption of the natural resources and improve the durability of concrete. In this study, the effect of the fineness on the high temperature and sulphate resistances of concrete mortar specimens, produced with ground granulated blast-furnace slag (GBFS) replacing cement, is investigated. The compressive and flexural strength test results for all series related to durability effects, exposing temperature and solutions, exposure times for these durability effects, slag content and fineness are discussed. Conse- quently, the optimum slag contents are determined for producing the sulphate and high temperature resistant mortars.

关键词： Cement Fineness Ground slag high temperature effect Sulphate attack Sustainable development

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Properties of failure mode and thermal damage for limestone at high temperature

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Mining Science and Technology 2009年第3期19卷 290-294页

作者： MAO Xian-biao ZHANG Lian-ying LI Tian-zhen LIU Hai-shun School of Sciences China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China State Key Laboratory of Geomechanics and Deep Underground Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China School of Mathematics and Physical Science Xuzhou Institute of Technology Xuzhou Jiangsu 221008 China

The mechanical properties of limestone such as the stress-strain curve, the variable characteristics of peak strength and the modulus of elasticity of limestone were studied under the action of temperatures ranging from room temperature to 800 °*** results show that:1) the temperature has not clear effect on the mechanical properties of limestone from room temperature to 600 °***, the mechanical properties of limestone deteriorate rapidly when the temperature is above 600 °*** this case, the peak stress and modulus of elasticity decrease *** the temperature reaches 800 °C, the entire process, showing the stress-strain curve is displayed indicating an obvious state of plastic-deformation;2) the failure mode of limestone shows the breakdown of tensile strength from room temperature to 600 °C, as well as the compress shearing damage over 600 °C;3) combining our test results with the concept of thermal damage, a thermal damage equation was derived.

关键词： limestone high temperature effect mech-anical properties clamage

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Experimental study on the mechanical properties of rocks at high temperature

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中国科学:技术科学 2010年第3期 331-331页

作者： ZHANG LianYing1,2,MAO XianBiao1,3 & LU AiHong1,3 1 School of Sciences,China University of Mining and Technology,Xuzhou 221116,China 2 School of Math and Physical Science,Xuzhou Institute of Technology,Xuzhou 221008,China 3 State Key Laboratory of Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221008,China

The mechanical properties of marble,limestone,and sandstone as well as the stress-strain curve,the varying characteristics of the peak strength,the peak strain and elastic modulus were studied by using the MTS810 Rock Mechanics Servo-controlled Testing System under the action of temperatures ranging from room temperature to 800℃.Results show that (1) the peak strength and elastic modulus of marble fluctuate at the temperature from normal to 400℃ ;and they decrease gradually over 400 ℃.(2) With the rise of the temperature,the peak strength and elastic modulus of limestone show downward trend from normal temperature to 200℃ ;have little change from 200 ℃ to 600 ℃;and decrease sharply over 600 ℃.(3) The peak strength of sandstone shows a downward trend while a little change for elastic modulus at normal temperature to 200 ℃;and from 200 ℃ to 600 ℃,the peak strength of sandstone increases while a little change for elastic modulus;the peak strength and elastic modulus decrease rapidly at the temperature over 600℃.(4) The peak strain of limestone shows little change at normal temperature to 600℃,however,the peak strain increases rapidly over 600℃ ;and for marble and sandstone,the peak strain decreases with the rise of the temperature from normal temperature to 200℃,the peak strain increases rapidly over 200℃.The result can provide valuable references for the rock engineering design at high temperature.

关键词： rock mechanics high temperature effect mechanical properties experimental study

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