http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Yuezhong Ye (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Shengai Cui,Deli Xu,Pin Liu,Yuezhong Ye 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.6
To solve the problem on the serious loss of bond strength of shotcrete in hot and dry environments, the measures for improving the bond strength were explored by mixing mineral admixtures or fiber materials into shotcrete mixture. The bond strengths between shotcrete and rock in hot and dry environments were measured by splitting method, and macroscopic, mesoscopic and microscopic analyses were carried out on shotcrete specimens. The results show that: in hot and dry environments, the bond strengths all decrease when mixed with mineral admixtures, and especially for the fly ash, with which the bond strength of shotcrete decreases by 36.7%. Mixing polypropylene fibers into shotcrete makes its bond strength decrease by 10.2%, but for steel fibers, it will be improved by 41.8% compared with basic mix proportion. Moreover, according to submicroscopic measurement and microscopic analysis, the influence mechanisms of mineral admixtures and fiber materials have been explored to some extent. Therefore, it’s feasible and effective to improve the bond strength by adding steel fibers in hot and dry environment.
-
Shengai Cui,Bing Zhu,Fuhai Li,Yuezhong Ye 대한토목학회 2016 KSCE Journal of Civil Engineering Vol.20 No.4
To study the bond performance between shotcrete and rock in a hot and humid tunnel, experiments on wet-sprayed shotcrete specimens under different hot and humid curing conditions (35°C, 50°C, 70°C, and standard curing conditions: 20°C with relative humidity 95%) were performed to examine the influence of thermal damage. The results show that the bond strength at 35°C is higher compared with that at standard curing conditions, but decreases when the temperature rises (especially at 70°C), indicating the adverse effects of thermal damage on bond strength. Based on these results, we used the worst hot and humid condition (70°C) as a case study to explore measures to improve bond strength under hot and humid conditions by adding mineral admixture or fiber material to the shotcrete mix. The experimental results suggest that adding fly ash or slag powder can enhance the bond strength, with the best effect achieved by adding fly ash.
-
Shengai Cui,Pin Liu,Xuewei Wang,Yibin Cao,Yuezhong Ye 사단법인 한국계산역학회 2017 Computers and Concrete, An International Journal Vol.19 No.5
Taking high geothermal tunnels as background, the deformation of concrete for shotcrete use was studied by simulating hot-humid and hot-dry environments in a laboratory. The research is made up by two parts, one is the influence of two kinds of high geothermal environments on the deformation of shotcrete, and the other is the shrinkage inhibited effect of fiber materials (steel fibers, polypropylene fibers, and the mixture of both) on the concrete in hot-dry environments. The research results show that: (1) in hot and humid environments, wet expansion and thermal expansion happened on concrete, but the deformation is smooth throughout the whole curing age. (2) In hot and dry environments, the concrete suffers from shrinkage. The deformation obeys linear relationship with the natural logarithm of curing age in the first 28 days, and it becomes stable after the 28th day. (3) The shrinkage of concrete in a hot and dry environment can be inhibited by adding fiber materials especially steel fibers, and it also obeys linear relationship with the natural logarithm of curing age before it becomes stable. However, compared with no-fiber condition, it takes 14 days, half of 28 days, to make the shrinkage become stable, and the shrinkage ratio of concrete at 180-day age decreases by 63.2% as well. (4) According to submicroscopic and microscopic analysis, there is great bond strength at the interface between steel fiber and concrete. The fiber meshes are formed in concrete by disorderly distributed fibers, which not only can effectively restrain the shrinkage, but also prevent the micro and macro cracks from extending.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
