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| 1 | Investigation on thermophysical properties of reactive powder concrete显示文摘The thermophysical properties,such as thermal conductivity,thermal diffusivity,specific heat capacity and linear thermal expansion of reactive powder concrete(RPC) with different steel fiber volumetric fractions are investigated by means of high temperature tests. The thermophysical characteristics of RPC with different fiber volumes under different temperatures are analyzed and compared with those of the common high-strength concrete and high-performance concrete. The empirical relationships of thermophysical properties with temperature and fiber volume are identified. By the heat transfer and solid physics methods,the microscopic physical mechanism of heat transfer process and heat conduction properties of RPC are investigated,and the theoretical formulas of specific heat capacity and thermal expansion coefficient are derived,respectively. The effects of temperature and steel fibers on the specific heat capacity and the thermal expansion coefficient are quantitatively analyzed and the discriminant conditions are provided. It is shown that the experimental results are consistent with the theoretical prediction. | JU Yang LIU HongBin LIU JinHui TIAN KaiPei WEI Song HAO Song | 2011 | Science China(Technological Sciences)2011，54，12： | 13 |
| 2 | 偏高岭土高性能混凝土的强度和抗氯离子渗透性研究显示文摘通过5种不同偏高岭土掺量混凝土立方体、棱柱体和梁试件的抗压(单轴、轴心)、劈裂和抗折试验,以及电通量试验,研究了偏高岭土掺量对混凝土强度和抗氯离子渗透性的影响。结果表明:掺加偏高岭土后,可以有效提高混凝土的强度和显著改善抗氯离子渗透性,偏高岭土存在一个最优掺量,当掺量为15%时,混凝土的强度和抗氯离子渗透性最佳。 | 刘红彬 盛星汉 唐伟奇 肖凯璐 马唯哲 施政奇 李希光 | 2015 | 公路2015，60，2： | 12 |
| 3 | Experimental study of dynamic mechanical properties of reactive powder concrete under high-strain-rate impacts显示文摘The dynamic mechanical properties of reactive powder concrete subjected to compressive impacts with high strain rates ranging from 10 to 1.1×102 s-1 were investigated by means of SHPB (split-Hopkinson-pressure-bar) tests of the cylindrical specimens with five different steel fiber volumetric fractions.The properties of wave stress transmission,failure,strength,and energy consumption of RPC with varied fiber volumes and impact strain rates were analyzed.The influences of impact strain rates and fiber volumes on those properties were characterized as well.The general forms of the dynamic stress-strain relationships of RPC were modeled based on the experimental data.The investigations indicate that for the plain RPC the stress response is greater than the strain response,showing strong brittle performance.The RPC with a certain volume of fibers sustains higher strain rate impact and exhibits better deformability as compared with the plain RPC.With a constant fiber fraction,the peak compressive strength,corresponding peak strain and the residual strain of the fiber-reinforced RPC rise by varying amounts when the impact strain rate increases,with the residual strain demonstrating the greatest increment.Elevating the fiber content makes trivial contribution to improving the residual deformability of RPC when the impact strain rate is constant.The tests also show that the fiber content affects the peak compressive strength and the peak deformability of RPC in a different manner.With a constant impact strain rate and the fiber fraction less than 1.75%,the peak compressive strength rises with an increasing fiber volume.The peak compressive strength tends to decrease as the fiber volume exceeds 1.75%.The corresponding peak strain,however,incessantly rises with the increasing fiber volume.The total energy Edisp that RPC consumed during the period from the beginning of impacts to the time of residual strains elevates with the fiber volume increment as long as the fiber fraction is not larger than 2%.It turns to decrease if the fiber volume exceeds 2%.The added fibers make various contributions to enhancing the capability of RPC to consume energy at different loading stages.If the fiber fraction is not larger than 2%,the added fibers make more contribution to enhancing the energy consumption ability of RPC in the period before the peak strain than in the period after the peak strain.The impact strain rate,however,distinctively affects the total energy that RPC consumed and the energy consumed in the different loading periods.The higher the impact strain rate,the more the energy consumed in the stages and therefore the higher the dynamic impact toughness.The empirical relationships of the peak compressive strength,corresponding peak strain,residual strain,total consumed energy and the energy consumed in the varied periods with the impact strain rate and the fiber fraction are derived.Four generalized forms of the dynamic impact stress-strain responses of RPC are formulated by normalizing stresses and strains as the generalized coordinates and by taking account of the influences of impact strain rates and fiber volumetric fractions. | JU Yang1,2,LIU HongBin1,SHENG GuoHua1,3 & WANG HuiJie1 1 State Key Laboratory of Coal Resources and Safe Mining,Beijing Key Laboratory of Fracture and Damage Mechanics of Rocks and Concrete,China University of Mining and Technology,Beijing 100083,China 2 Department of Mechanical and Manufacturing Engineering,University of Calgary,2500 University Drive,AB T2N 1N4,Canada 3 School of Resources and Civil Engineering,Northeastern University,Shenyang 110004,China | 2010 | Science China(Technological Sciences)2010，53，9： | 8 |
| 4 | An investigation on micro pore structures and the vapor pressure mechanism of explosive spalling of RPC exposed to high temperature显示文摘Reactive powder concrete(RPC) is vulnerable to explosive spalling when exposed to high temperature.The characteristics of micro pore structure and vapor pressure of RPC are closely related to the thermal spalling.Applying mercury intrusion porosimetry(MIP) and scanning electron microscopy(SEM) techniques,the authors probed the characteristics of micro pore structures of plain RPC200 when heated from 20-350℃.The pore characteristics such as specific pore volume,threshold pore size and most probable pore size varying with temperatures were investigated.A vapor pressure kit was developed to measure the vapor pressure and its variation inside RPC200 at various temperatures.A thin-wall spherical pore model was proposed to analyze the thermo-mechanical mechanism of spalling,by which the stresses varying with the vapor pressure q(T) and the characteristic size of wall(K) at any point of interest were determined.It is shown that the pore characteristics including specific pore volume,average pore size,threshold pore size and most probable pore size rise significantly with the increasing temperature.200℃ appears to be the threshold temperature above which the threshold pore size and the most probable pore size climb up dramatically.The increase in the specific pore volume results from the growth both in quantity and in volume of the transition pores and the capillary pores.The appearance of the explosive spalling in RPC200 is mainly attributed to being unable to form pathways in favor of releasing water steam in RPC and to the rapid accumulation of high vapor pressures as well.The thin-wall sphere domain where the vapor pressure governs the spalling is bounded through the pore model. | JU Yang LIU HongBin TIAN KaiPei LIU JinHui WANG Li GE ZhiShun | 2013 | Science China(Technological Sciences)2013，56，2： | 8 |
| 5 | 高强与活性粉末混凝土尺寸效应的分析显示文摘活性粉末混凝土(Reactive Powder Concrete,简称RPC)是一种新型超高强、高性能水泥基复合材料。本文分析了高强混凝土以及活性粉末混凝土尺寸效应的研究成果和进展,在此基础上,初步探讨了RPC尺寸效应,分析了其中的难点问题。 | 冯磊 刘红彬 彭培火 王会杰 盛国华 李康乐 鞠杨 | 2010 | 四川建筑科学研究2010，36，3： | 7 |
| 6 | 钢纤维RPC永久柱模设计方法显示文摘目的为提高模板工程效益,提出一种新型的钢纤维活性粉末混凝土(RPC)永久柱模板,并对其设计方法进行研究.方法根据永久柱模的结构特性,以钢纤维RPC的材料性能为基础,基于现有规范的模板侧压力计算理论,建立两端固接计算模型并给出算例.结果提出了RPC永久柱模的侧板设计方法.并依据模板设计规范中承载能力极限状态与正常使用极限状态的相关要求,给出永久柱模壁厚的计算建议.结论 RFC永久柱模的设计方法、壁厚取值与设计建议为钢纤维RPC永久柱模的工程应用提供理论依据,使得钢纤维RPC永久柱模有广阔的应用前景. | 王钧 李论 李行 贾艳敏 | 2014 | 沈阳建筑大学学报(自然科学版)2014，30，6： | 6 |
| 7 | 掺引气剂活性粉末混凝土高温后强度退化及质量损失研究显示文摘对不同钢纤维体积掺量的掺入引气剂的活性粉末混凝土(简称RPC)试件及未掺引气剂的RPC试件进行了高温后力学性能测试和质量测量,考察了RPC在掺入引气剂或未掺引气剂时,受火温度对不同钢纤维体积掺量的RPC试件的抗压强度、抗折强度、折压比及质量损失的影响。试验结果表明,未掺引气剂的RPC在超过200℃时爆裂,且在200℃之前强度变化趋势与掺引气剂RPC的强度变化趋势一致。随着试件所受高温温度的升高,试件强度整体呈现阶梯下降趋势;400℃以前,钢纤维体积掺量对RPC强度影响甚微,400℃以后,钢纤维体积掺量越高,残余强度百分比越大。不同钢纤维体积掺量RPC试件的质量损失率趋势一致,纤维掺量对RPC质量损失率影响不大。 | 陈甜甜 姜宇 杜红秀 马克生 | 2018 | 四川建筑科学研究2018，44，3： | 1 |
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