TY - JOUR
T1 - Characterization of one-part alkali-activated slag with rice straw ash
AU - Yin, Kangting
AU - Jiang, Yaqing
AU - He, Hui
AU - Ren, Jie
AU - Li, Zhenming
PY - 2022
Y1 - 2022
N2 - In this paper, fresh (setting and rheology) and hardened properties (strength and shrinkage) of one-part alkali-activated slag (AAS) with and without rice straw ash (RSA) are comprehensively investigated. The reaction kinetics and microstructure of the mixtures are characterized by a series of experimental techniques. The results reveal that RSA plays dual roles in AAS, as a precursor (though not fully reactive) and an internal curing agent. The reactive K and Si in RSA participate in the formation of C-(A)-S-H gel and the alkaline groups dissolved from the ash facilitate the hydrolysis of slag. Besides, the porous RSA absorbs liquid in the first day and releases it afterwards, thus providing internal curing to the matrix. The consistency index of the paste becomes higher with the incorporation of RSA. Both autogenous and drying shrinkage of AAS, which are considered as two problematic issues for this material, are mitigated by RSA.
AB - In this paper, fresh (setting and rheology) and hardened properties (strength and shrinkage) of one-part alkali-activated slag (AAS) with and without rice straw ash (RSA) are comprehensively investigated. The reaction kinetics and microstructure of the mixtures are characterized by a series of experimental techniques. The results reveal that RSA plays dual roles in AAS, as a precursor (though not fully reactive) and an internal curing agent. The reactive K and Si in RSA participate in the formation of C-(A)-S-H gel and the alkaline groups dissolved from the ash facilitate the hydrolysis of slag. Besides, the porous RSA absorbs liquid in the first day and releases it afterwards, thus providing internal curing to the matrix. The consistency index of the paste becomes higher with the incorporation of RSA. Both autogenous and drying shrinkage of AAS, which are considered as two problematic issues for this material, are mitigated by RSA.
KW - Alkali-activated slag
KW - Microstructure
KW - One-part material
KW - Rice straw ash
KW - Shrinkage
UR - http://www.scopus.com/inward/record.url?scp=85134563502&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2022.128403
DO - 10.1016/j.conbuildmat.2022.128403
M3 - Article
AN - SCOPUS:85134563502
SN - 0950-0618
VL - 345
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 128403
ER -