Laboratory Investigation into the Modification of Transport Properties of High-Volume Fly Ash Mortar by Chemical Admixtures

被引:8
作者
Du, Sen [1 ,2 ]
Zhao, Hui [1 ]
Ge, Yong [1 ]
Yang, Zhengxian [3 ]
Shi, Xianming [4 ]
机构
[1] Harbin Inst Technol, Sch Transportat Sci & Engn, Harbin 150090, Heilongjiang, Peoples R China
[2] Washington State Univ, Dept Civil & Environm Engn, Pullman, WA 99164 USA
[3] Washington State Univ, Dept Civil & Environm Engn, Lab Corros Sci & Electrochem Engn, Pullman, WA 99164 USA
[4] Washington State Univ, Lab Adv & Sustainable Cementitious Mat, Dept Civil & Environm Engn, Pullman, WA 99164 USA
关键词
High-volume fly ash; Transport properties; Surface free energy; Pore size distribution; Critical radius; SURFACE FREE-ENERGY; MECHANICAL-PROPERTIES; CEMENTITIOUS MATERIALS; PORTLAND-CEMENT; DEICING SALT; CONCRETE; PERMEABILITY; HYDRATION; MICROSTRUCTURE; DESIGN;
D O I
10.1061/(ASCE)MT.1943-5533.0002025
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
This work aims to optimize the transport properties of high-volume fly ash (HVFA) mortars that replace Portland cement with a Class C fly ash at 60% by weight. Ten chemical admixtures (five nonpolymers and five polymers) previously reported to improve the early-age strength or water resistance of concrete were investigated for their effects on the HVFA mortars. A total of 26 mortar mixtures were designed and tested, based on a statistical design to explore the potential synergistic effects among the polymeric admixtures and the non-polymeric admixtures, respectively. At the age of 28 days, the compressive strength, splitting tensile strength, and water sorptivity of all mortar mixtures and the gas permeability of six selected mixtures from each group were tested. In addition, the surface free energy and pore size distribution of the selected mortars were obtained in the effort to correlate with water sorptivity and gas permeability, respectively. The predictive models built on the results of designed experiments suggest that if used individually, tributyl phosphate, hydroxypropyl methyl cellulose, and hydroxyl terminated polysiloxane are the three admixtures that can effectively reduce the water sorptivity of HVFA mortars. For the six selected HVFA mortars, those containing polymeric admixtures exhibited a significantly lower gas permeability coefficient than those containing nonpolymeric admixtures. The water sorptivity of HVFA mortars was mainly affected by the microstructure of mixtures rather than their surface free energy. The nonpolymeric admixtures worked better in refining the pore structure in the HVFA mortars and reducing the critical radius than the polymeric admixtures. (C) 2017 American Society of Civil Engineers.
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页数:11
相关论文
共 41 条
[1]   Development of a permeability apparatus for concrete and mortar [J].
Alshamsi, AM ;
Imran, HDA .
CEMENT AND CONCRETE RESEARCH, 2002, 32 (06) :923-929
[2]   Permeability of concrete under stress [J].
Banthia, N ;
Biparva, A ;
Mindess, S .
CEMENT AND CONCRETE RESEARCH, 2005, 35 (09) :1651-1655
[3]   Surface energetics of cementitious materials and their wettability by an epoxy adhesive [J].
Benzarti, Karim ;
Perruchot, Christian ;
Chehimi, Mohamed A. .
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 2006, 286 (1-3) :78-91
[4]   Evolution of pore structure in blended systems [J].
Berodier, E. ;
Scrivener, K. .
CEMENT AND CONCRETE RESEARCH, 2015, 73 :25-35
[5]   Effect of EVA on the fresh properties of cement paste [J].
Betioli, A. M. ;
Gleize, P. J. P. ;
John, V. M. ;
Pileggi, R. G. .
CEMENT & CONCRETE COMPOSITES, 2012, 34 (02) :255-260
[6]   Characterization and evaluation of the surface free energy for cementitious materials [J].
Biqin Dong ;
Lye Yang ;
Qingyun Yuan ;
Yuqing Liu ;
Jianchao Zhang ;
Guohao Fang ;
Yanshuai Wang ;
Yinghuan Yan ;
Feng Xing .
CONSTRUCTION AND BUILDING MATERIALS, 2016, 110 :163-168
[7]   Application of anionic asphalt emulsion as an admixture for concrete [J].
Boltryk, Michal ;
Malaszkiewicz, Dorota .
CONSTRUCTION AND BUILDING MATERIALS, 2013, 40 :556-565
[8]  
Bouzoubaâ N, 2002, ACI MATER J, V99, P560
[9]   A comparative study of self-consolidating concretes incorporating high-volume natural pozzolan or high-volume fly ash [J].
Celik, Kemal ;
Meral, Cagla ;
Mancio, Mauricio ;
Mehta, P. Kumar ;
Monteiro, Paulo J. M. .
CONSTRUCTION AND BUILDING MATERIALS, 2014, 67 :14-19
[10]   Fluid transport in high volume fly ash mixtures with and without internal curing [J].
De la Varga, Igor ;
Spragg, Robert P. ;
Di Bella, Carmelo ;
Castro, Javier ;
Bentz, Dale P. ;
Weiss, Jason .
CEMENT & CONCRETE COMPOSITES, 2014, 45 :102-110