Alkali-activated slag (AAS) paste: Correlation between durability and microstructural characteristics

被引:171
作者
Shariati, Mahdi [1 ]
Shariati, Ali [2 ,3 ]
Nguyen Thoi Trung [2 ,3 ]
Shoaei, Parham [4 ]
Ameri, Farshad [5 ]
Bahrami, Nasrollah [6 ]
Zamanabadi, Saeid Narimani [6 ]
机构
[1] Duy Tan Univ, Inst Res & Dev, Da Nang 550000, Vietnam
[2] Ton Duc Thang Univ, Inst Computat Sci, Div Computat Math & Engn, Ho Chi Minh City, Vietnam
[3] Ton Duc Thang Univ, Fac Civil Engn, Ho Chi Minh City, Vietnam
[4] Sharif Univ Technol, Dept Civil Engn, Tehran, Iran
[5] Univ Sains Malaysia, Sch Housing Bldg & Planning, George Town 11800, Malaysia
[6] Islamic Azad Univ, Dept Civil Engn, Isfahan Khorasgan Branch, Esfahan, Iran
关键词
Alkali-activated slag; Silica fume (SF); Durability; Microstructure; Acid attack; Repair paste; ASH BASED-GEOPOLYMER; BLAST-FURNACE SLAG; BASE-ISOLATED STRUCTURES; AGE REACTION-KINETICS; MECHANICAL-PROPERTIES; SILICA-FUME; SULFURIC-ACID; GEOTECHNICAL PROPERTIES; COMPRESSIVE STRENGTH; SODIUM-HYDROXIDE;
D O I
10.1016/j.conbuildmat.2020.120886
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
This study was aimed at evaluating the effects of alkali activator solution and utilization of silica fume (SF) on durability and microstructural characteristics of alkali-activated ground granulated blast furnace slag (GGBFS) pastes. The pastes were activated with sodium silicate (SS) blended with NaOH (SH) solution with molar concentrations of 8 M, 12 M, and 16 M and SS:SH ratios of 1.0, 2.5, and 4.0. The same mixes were prepared with SF as partial replacement of GGBFS at a dosage of 10% by weight. The initial and final water absorption as well as the electrical resistivity of the specimens were measured. The optimal paste fabricated with 12 M NaOH solution and SS:SH ratio of 2.5 showed the lowest water absorption and the highest electrical resistivity. Inclusion of SF reduced the final water absorption by 29% and increased the electrical resistivity by 62% compared to the same mix without SF. The observations were confirmed by the results of scanning electron microscopy (SEM) where the optimal paste showed a dense matrix with few pores. Furthermore, the chemical composition of the pastes was studied through energy-dispersive spectrometry (EDS) and X-ray diffraction (XRD) analyses. Moreover, the resistance to aggressive environment conditions of the pastes was examined through exposure to 5% hydrochloric acid and nitric acid up to 90 days. Generally, specimens were more resistant to nitrates. The specimens showed about 5-8% increase in their compressive strength compared to the unconditioned specimens during the first 28 days; however, up to 22% reduction in compressive strength was noticed after 90 days of exposure. It was shown that SS:SH ratio has a higher contribution to acid attack resistance of alkali-activated slag (AAS) pastes. (C) 2020 Published by Elsevier Ltd.
引用
收藏
页数:18
相关论文
共 87 条
[1]   Corrosion resistance evaluation of rebars with various primers and coatings in concrete modified with different additives [J].
Afshar, Alireza ;
Jahandari, Soheil ;
Rasekh, Haleh ;
Shariati, Mahdi ;
Afshar, Abdollah ;
Shokrgozar, Ali .
CONSTRUCTION AND BUILDING MATERIALS, 2020, 262
[2]   Durability evaluation of geopolymer and conventional concretes [J].
Albitar, M. ;
Ali, M. S. Mohamed ;
Visintin, P. ;
Drechsler, M. .
CONSTRUCTION AND BUILDING MATERIALS, 2017, 136 :374-385
[3]   Factors affecting the mechanical properties of alkali activated ground granulated blast furnace slag concrete [J].
Aliabdo, Ali A. ;
Abd Elmoaty, Abd Elmoaty M. ;
Emam, Mohammed A. .
CONSTRUCTION AND BUILDING MATERIALS, 2019, 197 :339-355
[4]   Zero-cement vs. cementitious mortars: An experimental comparative study on engineering and environmental properties [J].
Ameri, Farshad ;
Zareei, Seyed Alireza ;
Behforouz, Babak .
JOURNAL OF BUILDING ENGINEERING, 2020, 32
[5]   Partial replacement of copper slag with treated crumb rubber aggregates in alkali-activated slag mortar [J].
Ameri, Farshad ;
Shoaei, Parham ;
Musaeei, Hamid Reza ;
Zareei, Seyed Alireza ;
Cheah, Chee Ban .
CONSTRUCTION AND BUILDING MATERIALS, 2020, 256
[6]   Geopolymers vs. alkali-activated materials (AAMs): A comparative study on durability, microstructure, and resistance to elevated temperatures of lightweight mortars [J].
Ameri, Farshad ;
Shoaei, Parham ;
Zareei, Seyed Alireza ;
Behforouz, Babak .
CONSTRUCTION AND BUILDING MATERIALS, 2019, 222 :49-63
[7]  
[Anonymous], 2013, C64213 ASTM INT
[8]  
[Anonymous], 2012, C176012 ASTM INT
[9]  
[Anonymous], 2016, C109C109M16A ASTM IN
[10]  
[Anonymous], 2011, 1881 BS 122