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| 1 | 再生混凝土界面过渡区纳观力学性能试验研究显示文摘对采用不同搅拌工艺的再生混凝土的宏观力学性能进行试验研究.采用纳米压痕技术和扫描电镜等设备研究了再生混凝土界面过渡区的纳观力学性能和微观结构特征.试验结果表明,采用普通搅拌工艺的新界面过渡区的弹性模量随着与老砂浆表面距离的增加而降低,但是采用二次搅拌工艺的弹性模量基本保持不变.老界面过渡区的弹性模量随着与天然骨料的距离增大而逐渐增加.采用二次搅拌工艺新的界面过渡区的微观结构较普通搅拌工艺的新界面过渡区更为致密,且孔隙率和氢氧化钙晶体含量较少.由再生混凝土的界面过渡区纳观力学性能和宏观抗压强度之间的关系,可知采用二次搅拌工艺可以改善界面过渡区的力学性能和微观结构,进而提高再生混凝土的宏观力学性能. | 李文贵 肖建庄 黄靓 Surendra P.Shah P.Shah | 2014 | 湖南大学学报(自然科学版)2014，41，12： | 24 |
| 2 | 采用纳米压痕及动态模量图研究C-S-H凝胶/水泥颗粒界面的纳米力学性能(英文)显示文摘目的:揭示水泥基材料中C-S-H凝胶/水泥颗粒界面的尺寸及微观力学特性,为从纳米尺度理解水泥基材料的性能提供依据。创新点:采用动态模量图技术对C-S-H凝胶/水泥颗粒界面微区的尺度及力学行为进行研究,借助动态模量图的高分辨性,可获得该微区精确且有效的信息。方法:对比利用纳米压痕及动态模量图对C-S-H凝胶/水泥颗粒界面进行研究。结论:纳米压痕仅能粗略估计界面微区的尺寸及力学参量,相比之下,动态模量图的分辨率要高出2个数量级(表2),因此可获得更精确的测量值。C-S-H凝胶/水泥颗粒界面的尺寸在250 nm左右,模量值介于60 GPa和70 GPa之间。此界面区可认为是包覆水泥颗粒周围的一层紧密的水化层结构,其致密性将阻止内部水泥的进一步水化。 | Jing XU David J.CORR Surendra P.SHAH | 2015 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2015，16，1： | 4 |
| 3 | Mechanical Properties of Micro-regions in Cement-based Material based on the PeakForce QNM Mode of AFM显示文摘In this paper, the cement paste and the mortar were tested using the PF-QNM technique. It is shown that the PF-QNM technique is very powerful to characterize the mechanical properties of micro-and nanostructures in the cement-based materials. It does not have strict requirements for test environment and it does not damage the surface of the material. High-resolution images can be obtained very easily, and they can be analyzed statistically. The test results show that PF-QNM analysis can test not only the mechanical properties of the cement paste, but also investigate the interfacial regions in the cement-based material, including the variation in the mechanical properties of interface regions and the extension of the interfacial regions. During the test, care must be taken to choose the size of test area;indeed, a test area too small is not representative but too large leads to lack of stability. The recommended side is a square with a length of in the range 10-30 μm. | 任梅 施韬 David J.Corr Surendra P.Shah | 2019 | Journal of Wuhan University of Technology(Materials Science)2019，34，4： | 3 |
| 4 | Review of recent developments in cement composites reinforced with fibers and nanomaterials显示文摘The quest for high-performance construction materials is led by the development and application of new reinforcement materials for cement composites.Concrete reinforcement with fibers has a long history.Nowadays,many new fibers associated with high performance and possessing eco-environmental characteristics,such as basalt fibers and plant fibers,have received much attention from researchers.In addition,nanomaterials are considered as a core material in the modification of cement composites,specifically in the enhancement of the strength and durability of composites.This paper provides an overview of the recent research progress on cement composites reinforced with fibers and nanomaterials.The influences of fibers and nanomaterials on the fresh and hardened properties of cement composites are summarized.Moreover,future trends in the application of these fibers or of nanomaterial-reinforced cement composites are proposed. | Jianzhuang XIAO Nv HAN Yan LI Zhongsen ZHANG Surendra P.SHAH | 2021 | Frontiers of Structural and Civil Engineering2021，15，1： | 3 |
| 5 | Shrinkage Cracking of High-Strength Concrete显示文摘 | Karl Wiegrink Shashidhara Marikunte Surendra P.Shah | | 0，，： | 1 |
| 6 | Plastic Shrinkage Cracking in Concrete Materials-Influence of fly ash and fibers显示文摘 | Kejin Wang Surendra P.Shah Pariya Phuaksuk | | 0，，06： | 1 |
| 7 | A method to predict shrinkage cracking of concrete显示文摘 | Surendra P.Shah Ouyang C S | | 0，，04： | 1 |
| 8 | Evaluation of Various Modification Methods for Enhancing the Performance of Recycled Concrete Aggregate显示文摘Due to the existence of the attached mortar,the performance of the recycled concrete aggregate(RCA)is inferior to the natural aggregate,which significantly limits its wide application in industry.In this study,five kinds of modified solutions were used to modify the surface of RCA,and the modification effects were compared.The results showed that sodium silicate,nano-silica(NS),Bacillus pasteurii and soybean powder had relatively good modification effects on RCA,which could reduce the crushing value and water absorption,and increase apparent density.The composite solution(15%sodium silicate and 2%NS)and soybean powder solution had better modification effect.The 28 d compressive strength and splitting tensile strength of recycled aggregate concrete(RAC)prepared by RCA modified by soybean powder solution were 4.6%and 5.2%higher than those prepared by RCA modified by composite solution,respectively.This indicates that among the five kinds of modified solutions,soybean powder solution has the best modification effect on RCA,and the optimal soaking time of soybean powder solution is 8 h.At this time,the crushing value,water absorption and apparent density of RCA are 12.8%,5.3%,and 2653 kg/m^(3),respectively.The research results of this study provide a reference for the modification of RCA and its efficient utilization. | Xiaoyan Liu Li Liu Junqing Zuo Pingzhong Zhao Xian Xie Shijie Li Kai Lyu Chunying Wu Surendra P.Shah | 2022 | Journal of Renewable Materials2022，10，10： | 0 |
| 9 | Editorial: Low‑carbon Materials and Green Construction显示文摘Dear colleagues,Welcome to the inaugural issue of Low-carbon Materials and Green Construction(LMGC).This journal is a new international journal concerned with the materials and construction in civil engineering to cope with the challenges raised by climate change,together with resources and energy consumption,which is dedicated to the widest dissemination of high-quality original research and insights. | Xuwen Xiao Surendra P.Shah Jianzhuang Xiao | 2023 | Low-carbon Materials and Green Construction2023，1，1： | 0 |
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