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- 저자 : Semiha Akçaözoğlu (검색결과 1 건)
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Investigation of Hydration Temperature of Alkali Activated Slag Based Concrete
Kubilay Akçaözoğlu,Semiha Akçaözoğlu,Abdullah Açıkgöz 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.8
This paper presents the results of an investigation on the effect of activator type, binder amount and sodium dosage on hydrationheats of Alkali-Activated Slag (AAS) concrete. For the slag activation, sodium hydroxide (NaOH) pellets and the mixture ofNaOH+liquid sodium silicate (Na2SiO3) were used at three sodium concentrations, 4%, 6% and 8% by mass of slag. Twenty onedifferent mixtures were prepared for the laboratory tests. In the reference three mixtures, OPC was used as binder and in the otherAAS mixtures Granulated Blast Furnace Slag (GBFS) was used. The binder dosages were 300, 350 and 400 kg/m3 and the waterbinder(w/b) ratio used in the mixtures was 0.50. The compressive strength and hydration temperature of produced concretes weremeasured. The temperature change of specimens measured in every 15 minutes until 120 hours. The test results showed that, thecompressive strengths and hydration temperatures of the mixtures increased depending on increasing binder amount and sodiumdosage. The use of NaOH+Na2SiO3 mixture as activator increased compressive strength but decreased hydration temperature of themixtures. The hydration temperatures of all AAS mixtures were lower than OPC mixtures. Produced AAS concrete with lowhydration temperature can be an alternative in recycled construction material at mass concrete applications.
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