An investigation on blast-furnace stag as fine aggregate in alkali-activated slag mortars subjected to elevated temperatures

Alkali-activated slag is known as a building material for more than sixty years and is considered an alternative to Portland cement based binders. Compared to Portland cement it exhibits some superior properties such as higher resistance against chemical attack and exposure to elevated temperatures. Aluminosilicate binders are generally electrical insulators; however, electrical properties of building materials gain the importance in the new field of applications such as self-sensing or self-heating materials. This paper brings a comparison of the electrical properties, especially resistance and capacitance, between Portland cement and alkali-activated slag mortars. The measurements revealed that alkali-activated slag shows enhanced conducting properties due to the presence of mobile hydrated sodium ions and metallic iron microparticles.

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Effect of Sodium Hydroxide (NaOH) Concentration on Compressive Strength of Alkali-Activated Slag (AAS) Mortars

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.754-755.300 ◽

2015 ◽

Vol 754-755 ◽

pp. 300-304 ◽

Cited By ~ 6

Author(s):

Aimi Noorliyana Hashim ◽

Kamarudin Hussin ◽

Noorzahan Begum ◽

Mohd Mustafa Al Bakri Abdullah ◽

Kamrosni Abdul Razak ◽

...

Keyword(s):

Compressive Strength ◽

Blast Furnace ◽

Sodium Hydroxide ◽

Blast Furnace Slag ◽

Alkali Activated Slag ◽

Granulated Blast Furnace Slag ◽

Environmental Friendly ◽

Activated Slag ◽

Furnace Slag ◽

Alkali Activated

Energy saving in building technology is among the most critical problems in the world. Thus it is a need to develop sustainable alternatives to conventional concrete utilizing more environmental friendly materials. One of the possibilities to work out is the massive usage of industrial wastes like ground granulated blast furnace slag (GGBS) to turn them to useful environmental friendly and technologically advantageous cementitious materials. In this study, ground granulated blast furnace slag (GGBS) is used to produce of alkali activated slag (AAS) mortar with the effect of alkaline activator concentration. Alkali activated slag (AAS) mortar is accelerated using alkaline solution of sodium silicate mixed with sodium hydroxide. The fixed ratio of sodium silicate to sodium hydroxide is 1.7 and the concentration of sodium hydroxide is varied from 6M to 12M. Concentration of 10M NaOH promotes the best properties of mortar by achieving the greatest compressive strength. Substitution of mineral admixture also influences strength performance of AAS mortars. The mortar with 20% calcium carbonate demonstrates the maximum compressive strength. The used of alkaline activation system is the best method to prepare industrial byproduct concrete. Moreover, alkali activated product itself gains superior properties which lead to the system become the most interesting method to produce sustainable concrete.

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