Studies on high performance alkali activated slag concrete mixes subjected to aggressive environments and sustained elevated temperatures

Alkali-activated slag and fly ash (AASF) materials are emerging as promising alternatives to conventional Portland cement. Despite the superior mechanical properties of AASF materials, they are known to show large autogenous shrinkage, which hinders the wide application of these eco-friendly materials in infrastructure. To mitigate the autogenous shrinkage of AASF, two innovative autogenous-shrinkage-mitigating admixtures, superabsorbent polymers (SAPs) and metakaolin (MK), are applied in this study. The results show that the incorporation of SAPs and MK significantly mitigates autogenous shrinkage and cracking potential of AASF paste and concrete. Moreover, the AASF concrete with SAPs and MK shows enhanced workability and tensile strength-to-compressive strength ratios. These results indicate that SAPs and MK are promising admixtures to make AASF concrete a high-performance alternative to Portland cement concrete in structural engineering.

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The effect of fiber properties on high performance alkali-activated slag/silica fume mortars

Composites Part B Engineering ◽

10.1016/j.compositesb.2012.09.080 ◽

2013 ◽

Vol 45 (1) ◽

pp. 63-69 ◽

Cited By ~ 79

Author(s):

Serdar Aydın ◽

Bülent Baradan

Keyword(s):

Silica Fume ◽

High Performance ◽

Alkali Activated Slag ◽

Fiber Properties ◽

Activated Slag ◽

Alkali Activated

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Differences in Electrical Properties of Portland Cement and Alkali-Activated Slag Mortars

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.276.15 ◽

2018 ◽

Vol 276 ◽

pp. 15-20 ◽

Cited By ~ 1

Author(s):

Pavel Rovnaník ◽

Maria Míková ◽

Ivo Kusák ◽

Patrik Bayer

Keyword(s):

Electrical Properties ◽

Portland Cement ◽

Building Materials ◽

Elevated Temperatures ◽

Sodium Ions ◽

Alkali Activated Slag ◽

Self Heating ◽

Chemical Attack ◽

Activated Slag ◽

Alkali Activated

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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