Investigation of Hydration Temperature of Alkali Activated Slag Based Concrete

Küçük Resim Yok

Tarih

2018

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

Springer Verlag

Erişim Hakkı

info:eu-repo/semantics/closedAccess

Özet

This paper presents the results of an investigation on the effect of activator type, binder amount and sodium dosage on hydration heats of Alkali-Activated Slag (AAS) concrete. For the slag activation, sodium hydroxide (NaOH) pellets and the mixture of NaOH+liquid sodium silicate (Na2SiO3) were used at three sodium concentrations, 4%, 6% and 8% by mass of slag. Twenty one different mixtures were prepared for the laboratory tests. In the reference three mixtures, OPC was used as binder and in the other AAS 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 were measured. The temperature change of specimens measured in every 15 minutes until 120 hours. The test results showed that, the compressive strengths and hydration temperatures of the mixtures increased depending on increasing binder amount and sodium dosage. The use of NaOH+Na2SiO3 mixture as activator increased compressive strength but decreased hydration temperature of the mixtures. The hydration temperatures of all AAS mixtures were lower than OPC mixtures. Produced AAS concrete with low hydration temperature can be an alternative in recycled construction material at mass concrete applications. © 2017, Korean Society of Civil Engineers.

Açıklama

Anahtar Kelimeler

alkali activated slag, by-product, compressive strength, concrete, GBFS, hydration temperature

Kaynak

KSCE Journal of Civil Engineering

WoS Q Değeri

Q3

Scopus Q Değeri

Q2

Cilt

22

Sayı

8

Künye