Effect of sodium carbonate/sodium silicate activator on the rheology, geopolymerization and strength of fly ash/slag geopolymer pastes

被引:144
作者
Ishwarya, G. [1 ]
Singh, B. [2 ]
Deshwal, S. [2 ]
Bhattacharyya, S. K. [3 ]
机构
[1] CSIR Cent Bldg Res Inst, Acad Sci & Innovat Res AcSIR, Roorkee 247667, Uttar Pradesh, India
[2] CSIR Cent Bldg Res Inst, Roorkee 247667, Uttar Pradesh, India
[3] IIT K, Dept Civil Engn, Kharagpur 721302, W Bengal, India
关键词
Fly ash; Geopolymer; Calorimetry; Rheology; Compressive strength; ASH-BASED GEOPOLYMER; MECHANICAL-PROPERTIES; COMPRESSIVE STRENGTH; ALKALI ACTIVATION; REACTION-KINETICS; DRYING SHRINKAGE; CLASS-F; SLAG; WORKABILITY; CONCRETE;
D O I
10.1016/j.cemconcomp.2018.12.007
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Reactions between the fly ash/slag composite mix and the Na2CO3/Na2SiO3 activator were monitored through Isothermal conduction calorimetry. The resulting products were analyzed with the help of XRF, XRD and FT-IR techniques. In calorimetric response, the composite pastes had more total heat release than the fly ash paste requiring similar to 50% less activation energy to yield reaction products. These products were largely amorphous as observed in the XRD patterns. Rheological studies indicated that composite pastes were very stiff above 25 wt% slag addition as its yield stress was almost doubled to fly ash paste. The compressive strength of hardened pastes increased with increasing slag content and activator dosage and decreased with increasing water-binder ratio. The deposition of reaction products onto the fly ash/slag particle surfaces and also the dense microstructures as observed in FESEM supported higher strength of geopolymer pastes at higher activator and slag contents. The developed paste with standard sand at 1:2 ratio produced mortar with a compressive strength of similar to 72 MPa.
引用
收藏
页码:226 / 238
页数:13
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