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    Influence of Different Curing Regimes on the Performance and Microstructure of Alkali-Activated Slag Concrete

    Source: Journal of Materials in Civil Engineering:;2018:;Volume ( 030 ):;issue: 009
    Author:
    El-Hassan Hilal;Shehab Ehab;Al-Sallamin Abdelrahman
    DOI: 10.1061/(ASCE)MT.1943-5533.0002436
    Publisher: American Society of Civil Engineers
    Abstract: This paper investigates the performance and microstructure of alkali-activated slag concrete (AASC) subjected to different 28-day curing regimes: air, intermittent water curing (7 days in water followed by 21 days in air), and continuous water curing. Three concrete mixes were prepared with fixed contents of slag, desert dune sand, and aggregate and activated by an alkaline solution consisting of sodium silicate and sodium hydroxide. The ratio of alkaline activator solution (AAS) to slag was varied between .45 and .55. Samples were tested to assess transport and mechanical properties. Test results showed that an AAS:slag ratio of .5 provided optimal performance. Intermittent water curing was found to be the most effective curing regime, resulting in a reduction in porosity and sorptivity, and an increase in bulk electrical resistivity, modulus of elasticity, and compressive strength. Differential scanning calorimetry, Fourier transform infrared spectroscopy, and scanning electron microscopy were used to characterize the microstructure. Calcium alumino-silicate hydrate gel was highlighted as the main reaction product, while sodium alumino-silicate hydrate gel was only detected in air cured counterparts.
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      Influence of Different Curing Regimes on the Performance and Microstructure of Alkali-Activated Slag Concrete

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4247784
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    contributor authorEl-Hassan Hilal;Shehab Ehab;Al-Sallamin Abdelrahman
    date accessioned2019-02-26T07:32:52Z
    date available2019-02-26T07:32:52Z
    date issued2018
    identifier other%28ASCE%29MT.1943-5533.0002436.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4247784
    description abstractThis paper investigates the performance and microstructure of alkali-activated slag concrete (AASC) subjected to different 28-day curing regimes: air, intermittent water curing (7 days in water followed by 21 days in air), and continuous water curing. Three concrete mixes were prepared with fixed contents of slag, desert dune sand, and aggregate and activated by an alkaline solution consisting of sodium silicate and sodium hydroxide. The ratio of alkaline activator solution (AAS) to slag was varied between .45 and .55. Samples were tested to assess transport and mechanical properties. Test results showed that an AAS:slag ratio of .5 provided optimal performance. Intermittent water curing was found to be the most effective curing regime, resulting in a reduction in porosity and sorptivity, and an increase in bulk electrical resistivity, modulus of elasticity, and compressive strength. Differential scanning calorimetry, Fourier transform infrared spectroscopy, and scanning electron microscopy were used to characterize the microstructure. Calcium alumino-silicate hydrate gel was highlighted as the main reaction product, while sodium alumino-silicate hydrate gel was only detected in air cured counterparts.
    publisherAmerican Society of Civil Engineers
    titleInfluence of Different Curing Regimes on the Performance and Microstructure of Alkali-Activated Slag Concrete
    typeJournal Paper
    journal volume30
    journal issue9
    journal titleJournal of Materials in Civil Engineering
    identifier doi10.1061/(ASCE)MT.1943-5533.0002436
    page4018230
    treeJournal of Materials in Civil Engineering:;2018:;Volume ( 030 ):;issue: 009
    contenttypeFulltext
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