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Jingwei YING; Feiming SU; Shuangren CHEN
《结构与土木工程前沿(英文)》 2022年 第16卷 第3期 页码 302-315 doi: 10.1007/s11709-022-0803-7
关键词: recycled concrete beam the replacement rate of recycled coarse aggregate water–cement ratio digital image correlation
《结构与土木工程前沿(英文)》 2022年 第16卷 第2期 页码 191-201 doi: 10.1007/s11709-021-0792-y
关键词: cement fineness interfacial transition zone compressive and flexural strength
Deformation field and crack analyses of concrete using digital image correlation method
Yijie HUANG, Xujia HE, Qing WANG, Jianzhuang XIAO
《结构与土木工程前沿(英文)》 2019年 第13卷 第5期 页码 1183-1199 doi: 10.1007/s11709-019-0545-3
关键词: deformation filed distribution crack development digital image correlation method mechanical properties water-cement ratio characteristics of deformation and crack
蒋亚清
《中国工程科学》 2011年 第13卷 第9期 页码 69-75
为揭示梳形减水剂对水泥早期水化的影响规律,指导工程应用,通过SEM分析,研究了掺用3种典型结构的梳形减水剂的水泥浆体早期水化产物形貌及其电子特征数据。结果表明,梳形减水剂加速了水泥早期水化反应,且丙烯酸类、马来酸类共聚物分别促进了AFt、AFm的形成。因此,梳形减水剂品种对水泥早期水化和混凝土工程性能具有较大影响,应根据使用要求合理选用,必要时与缓凝剂、引气剂或消泡剂复合使用。
Extending blending proportions of ordinary Portland cement and calcium sulfoaluminate cement blends:
《结构与土木工程前沿(英文)》 2021年 第15卷 第5期 页码 1249-1260 doi: 10.1007/s11709-021-0770-4
关键词: calcium sulfoaluminate cement cement blends hydration reaction setting workability compressive strength
Yongji ZHANG, Lingling ZHOU, Guo ZENG, Huiping DENG, Guibai LI
《环境科学与工程前沿(英文)》 2010年 第4卷 第4期 页码 430-437 doi: 10.1007/s11783-010-0247-5
关键词: nitrification drinking water ammonia- oxidizing bacteria (AOB) chloramines organic carbon heterotrophic bacteria
Jiao Feng, Qiuhao Lu, Weimin Tan, Kequan Chen, Pingkai Ouyang
《化学科学与工程前沿(英文)》 2019年 第13卷 第1期 页码 80-89 doi: 10.1007/s11705-018-1763-2
1,5-Pentamethylene diisocyanate, a novel aliphatic diisocyanate formed from bio-based 1,5-pentamethylenediamine, has been used as a hard segmented material to synthesize polyurethane. In this study, several waterborne polyurethane (WPU) dispersions have been successfully prepared by a prepolymer process from 1,5-pentamethylene diisocyanate poly(polyether) with different NCO/OH ratios and 1,6-hexanediol (HDO)/dimethylol propionic acid (DMPA) molar ratios. The Fourier transform infrared (FTIR) spectra, thermogravimetric analysis, differential scanning calorimetry, X-ray diffraction, and a mechanical tensile test were used to investigate the structures, thermal stability, phase separation, crystallinity, mechanical properties, and adhesive performance of the WPU dispersions. The FTIR results indicate that the degree of hydrogen bonding and the numbers of urea groups increase as the NCO/OH ratio and HDO/DMPA molar ratio increase. Furthermore, the phase separation increases and the thermal stability decreases as the NCO/OH ratio increases or the HDO/DMPA molar ratio decreases. Finally, WPU3.0-2.4 (NCO/OH=3, HDO/DMPA=2.4) exhibits a maximum tensile strength and shear strength, pointing to its possible use as an adhesive. These results could provide a very valuable reference for industrial applications of WPU.
关键词: 1 5-pentamethylene diisocyanate polyurethane water based
A D POFALE, S P WANJARI
《结构与土木工程前沿(英文)》 2013年 第7卷 第1期 页码 39-45 doi: 10.1007/s11709-013-0193-y
关键词: bond strength Portland Pozzolane Cement (PPC) concrete Ordinary Portland Cement (OPC) concrete bond between concrete and steel pullout test development length
Autogenous healing mechanism of cement-based materials
《结构与土木工程前沿(英文)》 页码 948-963 doi: 10.1007/s11709-023-0960-3
关键词: autogenous healing cement-based materials healing mechanism aggregation effect
Research review of the cement sand and gravel (CSG) dam
Xin CAI, Yingli WU, Xingwen GUO, Yu MING
《结构与土木工程前沿(英文)》 2012年 第6卷 第1期 页码 19-24 doi: 10.1007/s11709-012-0145-y
关键词: cement sand and gravel (CSG) dam cement sand and gravel (CSG) material research review
Yanhua GUAN, Ying GAO, Renjuan SUN, Moon C. WON, Zhi GE
《结构与土木工程前沿(英文)》 2017年 第11卷 第3期 页码 338-345 doi: 10.1007/s11709-017-0411-0
关键词: Calcium Sulfoaluminate (CSA) cement Type III cement coefficient of thermal expansion (CTE) shrinkage rapid repair
Multiscale mechanical modeling of hydrated cement paste under tensile load using the combined DEM-MD
Yue HOU, Linbing WANG
《结构与土木工程前沿(英文)》 2017年 第11卷 第3期 页码 270-278 doi: 10.1007/s11709-017-0408-8
Mechanical properties and microstructure of multilayer graphene oxide cement mortar
《结构与土木工程前沿(英文)》 2021年 第15卷 第4期 页码 1058-1070 doi: 10.1007/s11709-021-0747-3
关键词: graphene oxide cement mortar mechanical properties microstructure
Silicon carbide waste as a source of mixture materials for cement mortar
Zhengwu Jiang, Qiang Ren, Haoxin Li, Qing Chen
《环境科学与工程前沿(英文)》 2017年 第11卷 第5期 doi: 10.1007/s11783-017-0974-y
关键词: Silicon carbide waste Cement mortar Fluidity Strength Shrinkage
The stress relaxation of cement clinkers under high temperature
Xiufang WANG,Yiwang BAO,Xiaogen LIU,Yan QIU
《机械工程前沿(英文)》 2015年 第10卷 第4期 页码 413-417 doi: 10.1007/s11465-015-0357-7
The energy consumption of crushing is directly affected by the mechanical properties of cement materials. This research provides a theoretical proof for the mechanism of the stress relaxation of cement clinkers under high temperature. Compression stress relaxation under various high temperatures is discussed using a specially developed load cell, which can measure stress and displacement under high temperatures inside an autoclave. The cell shows that stress relaxation dramatically increases and that the remaining stress rapidly decreases with an increase in temperature. Mechanical experiments are conducted under various temperatures during the cooling process to study the changes in the grinding resistance of the cement clinker with temperature. The effects of high temperature on the load-displacement curve, compressive strength, and elastic modulus of cement clinkers are systematically studied. Results show that the hardening phenomenon of the clinker becomes apparent with a decrease in temperature and that post-peak behaviors manifest characteristics of the transformation from plasticity to brittleness. The elastic modulus and compressive strength of cement clinkers increase with a decrease in temperature. The elastic modulus increases greatly when the temperature is lower than 1000 °C. The compressive strength of clinkers increases by 73.4% when the temperature drops from 1100 to 800 °C.
关键词: stress relaxation high temperature cement clinker compression elastic modulus
标题 作者 时间 类型 操作
Long term performance of recycled concrete beams with different water–cement ratio and recycled aggregate
Jingwei YING; Feiming SU; Shuangren CHEN
期刊论文
ITZ microstructure, thickness, porosity and its relation with compressive and flexural strength of cementmortar; influence of cement fineness and water/cement ratio
期刊论文
Deformation field and crack analyses of concrete using digital image correlation method
Yijie HUANG, Xujia HE, Qing WANG, Jianzhuang XIAO
期刊论文
Extending blending proportions of ordinary Portland cement and calcium sulfoaluminate cement blends:
期刊论文
Impact of total organic carbon and chlorine to ammonia ratio on nitrification in a bench-scale drinkingwater distribution system
Yongji ZHANG, Lingling ZHOU, Guo ZENG, Huiping DENG, Guibai LI
期刊论文
The influence of the NCO/OH ratio and the 1,6-hexanediol/dimethylol propionic acid molar ratio on the
Jiao Feng, Qiuhao Lu, Weimin Tan, Kequan Chen, Pingkai Ouyang
期刊论文
Study of bond strength between various grade of Ordinary Portland Cement (OPC) and Portland PozzolaneCement (PPC) mixes and different diameter of TMT bars by using pullout test
A D POFALE, S P WANJARI
期刊论文
Research review of the cement sand and gravel (CSG) dam
Xin CAI, Yingli WU, Xingwen GUO, Yu MING
期刊论文
Experimental study and field application of calcium sulfoaluminate cement for rapid repair of concrete
Yanhua GUAN, Ying GAO, Renjuan SUN, Moon C. WON, Zhi GE
期刊论文
Multiscale mechanical modeling of hydrated cement paste under tensile load using the combined DEM-MD
Yue HOU, Linbing WANG
期刊论文
Silicon carbide waste as a source of mixture materials for cement mortar
Zhengwu Jiang, Qiang Ren, Haoxin Li, Qing Chen
期刊论文