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http://dx.doi.org/10.11112/jksmi.2015.19.5.104

Mechanical Properties of Granulated Ground Blast Furnace Slag on Blended Activator of Sulfate and Alkali  

Kim, Tae-Wan (부산대학교 녹색국토물관리연구소)
Jun, Yu-Bin (울산과학기술대학교 도시환경공학부)
Eom, Jang-Sub ((주)내일기술단 부설연구소)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.19, no.5, 2015 , pp. 104-111 More about this Journal
Abstract
This study shows the mechanical properties of alkali-activated slag cement (AASC) synthesized using sulfate with NaOH solution. The used sulfates were calcium sulfate ($CaSO_4$, denoted CS) and sodium sulfate ($Na_2SO_4$, denoted SS). The replacement ratio of sulfates was 2.5, 5.0, 7.5 and 10.0% by weight of slag. NaOH solution of 2M and 4M concentration was used. A sample was activated with sulfate and activated with blended activator (blending NaOH solution with sulfate) respectively. 24 mix ratios were used and the water-binder weight ratio for the test was set 0.5. This research carried out the compressive strength, flexural strength, ultrasonic pulse velocity (UPV), absorption and X-ray diffraction (XRD). In the case of samples with CS, sample with 7.5% CS, sample with 2M NaOH+5.0% CS and sample with 4M NaOH+5.0% CS showed the good performance in the strength development. In the case of samples with SS, sample with 10.0% SS, sample with 2M NaOH+7.5% SS and sample with 4M NaOH+2.5% SS obtained good performance in strength. The results of UPV and water absorption showed a similar tendency to the strength properties. The XRD analysis of samples indicated that the hydration products formed in samples were ettringite, CSH and silicate phases. In this study, it is indicated that when compared to the use of sulfate only, the use of both sulfate and NaOH solution makes mechanical properties of AASC better.
Keywords
Calcium sulfate; Sodium sulfate; Sodium hydroxide; Blended activator; Alkali-activated slag cement;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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