Papers by Keyword: Dry Shrinkage

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Authors: Li Juan Zhang, Yi Dong Xu, Lei Pan, Bing Bing Wang, Chi Lou
Abstract: Based on the technology of high performance concrete, high performance recycled pavement concrete (HPRPC) were developed by double -mixture of fly ash and superplasticizer. The dry shrinkage and plastic shrinkage cracking evaluation test were conducted. As is shown by the results, the compressive strength of HPRPC at 28d are exceed in 60MPa and dry shrinkage at 120d are less than 500με. By contrast, the cracking -resistant performance of HPRPC-7 is superior to that of HPRPC-2.
Authors: Lian Yu Wei, Zhi Yu Guo
Abstract: In recent years, due to the dual pressures of resources and the environment,the clod recycled technology renovation and expansion of the old road and new road construction process increasingly attention increasingly wide range of applications. In this paper, the water stability of the cold recycled materials in asphalt pavement on cement additives, frozen stability, thermal shrinkage resistance, dry Shrinkage thefour indicators of experiments to evaluate its durability, and compared with the typical semi-rigid material. To verify the feasibility of the cold recycled material as road base material.
Authors: Cai Rong Lu, Xue Liang Ge, Guo Xing Mei, Wei Bao Liu, Heng Wang, Yao Li Qian
Abstract: Shrinkage stress of cementitious materials will generate if the dry shrinkage is restrained in drought condition. Shrinkage stress has influence on crack resistance of cementitious materials. The dry shrinkage of cementitious materials in different relative humidity was studied with Climate Simulation System. The dry shrinkage change law of concrete in 20°C, 60% relative humidity for 500 days and in 20°C, 10% relative humidity for 180 days was compared. The relation between water loss rate and shrinkage rate of cementitious materials in drought condition was analyzed.
Authors: Shu Hui Dong, Yong Ge, De Cheng Feng, Feng Ping Wang, Bao Sheng Zhang
Abstract: Effect of fly ash and slag on internal relative humidity (IRH) and dry shrinkage of light weight aggregate concrete (LWC) are studied in this paper. As indicated in this test, mixed with mineral additives can reduce dry shrinkage of concrete. The more volume of fly ash and slag ash, the lower decrease speed of IRH is, which contribute to the decreases of dry shrinkage rate too. At the same curing-age and dosage, the relative humidity inside the fly ash concrete is higher than the slag one. As consequence, the rate of dry shrinkage of fly ash concrete is lower than slag concrete. Also, there is a significant linear correlation between the lowered values of IRH and dry shrinkage rate.
Authors: Jian Mei Zhou, Run Xia Hao
Abstract: In order to improve the crack resistance of pumping concrete, effect of shrinkage reducing admixture on the performance of pumping concrete was stuied, the results showed that dry shrinkage decreased obviously when shrinkage reducing admixture was added into pump concrete , and 28d shrinkage can be reduced by over 40% when the dosage of shrinkage reducing admixture was 1.5% , while the shrinkage reducing admixture can significantly improve the fresh pumping concrete workability, improve compressive strength of 28d, but the flexura strength decreases slightly.
Authors: Feng Li, Zai Peng Cui
Abstract: An experimental study has been conducted to investigate the effect of silica fume on shrinkage and freezing-thawing durability of concrete, a large number of tests have been carried out in this study. The results indicate that the addition of silica fume has adverse effect on the dry shrinkage property of concrete. The dry shrinkage strain of the concrete containing silica fume is more than that of the concrete without silica fume, and a considerable increase for the dry shrinkage strain of the concrete was observed by increasing the dosage of silica fume. However, the addition of silica fume can improve the freezing-thawing durability of the concrete evidently, and the freezing-thawing durability is becoming better and better as the silica fume content is increasing gradually.
Authors: Na Liang, Xiao Yan Zhang, Li Sun, Feng Lan Li
Abstract: Experiments were carried out to investigate the dry-shrinkage of masonry mortar affected by mass content of polypropylene fiber. The results show that proper content of polypropylene fiber is helpful to effectively reduce dry-shrinkage of mortar especially in early age, the reduction relates to water to cement ratio of mortar. Meanwhile, the relationships of water to cement ratio and content of polypropylene fiber in affecting dry-shrinkage of masonry mortar are analyzed, which can be as reference for selecting such optimum values as water to cement ratio and content of polypropylene fiber in practices.
Authors: Xiao Tian Zhang, Zhan Jian Liu, Ming Cheng Yang
Abstract: The basic mechanical properties of RAP used as semi-rigid cement stabilized macadam base were researched. To add fiber to improve the crack resistance of the cement stable macadam mixture, reduce pavement reflection crack. Sixteen groups orthogonal experiment were arranged by the factors as cement, fiber, waste asphalt concrete and fly ash, the unconfined compression test, split test and drying shrinkage experiment were carried out. The results showed that the effect of the factors on the sensitivity of unconfined compression strength is obviously different, and from large to small order is cement, fly ash, fiber, waste asphalt concrete. RAP fiber cement stabilized macadam can satisfied with the strength requriments of base and subbase of all levels of the road. It should set cement and fly ash as the main control factors in the optimization design of RAP fiber cement stabilized macadam.
Authors: Chao Zhang, Wei Wu, Rong Jun Chen
Abstract: By trying experiments on the dry-shrinkage and temperature-shrinkage performance, polypropylene fiber and glass fiber’s effect on the deformation performance of cement-stabilized macadam is researched. What’s more, the dry-shrinkage and temperature-shrinkage rule of fiber is discussed.
Authors: Wei Hong Xuan, Pan Xiu Wang, Yu Zhi Chen, Xiao Hong Chen
Abstract: The dry shrinkage deformation of polypropylene fiber mortar was analyzed by ANSYS software and compared with experiment value in this paper. The error of the calculated and experimental results in the 14 days and 28 days are 7.8% and 10.5%. It can be found that the calculated results are in good agreement with test results. The results indicate that the dry shrinkage value of polypropylene fiber mortar is lower than ordinary mortar. Adding polypropylene fibers can inhibit the process of cracking and improve the fracture toughness of cement-based materials.
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