Effect of high temperature on physical, mechanical and microstructure properties of alkali-activated slag pastes blended with ceramic waste material

2021 ◽  
pp. 1-20
Author(s):  
Ahmed S. Ouda
Keyword(s):  
High Temperature ◽  
Waste Material ◽  
Alkali Activated Slag ◽  
Ceramic Waste ◽  
Activated Slag ◽  
Alkali Activated

Microstructural alteration of alkali activated slag mortars depend on exposed high temperature level

2016 ◽  
Vol 104 ◽  
pp. 169-180 ◽  
Author(s):  
Hakan Tacettin Türker ◽  
Müzeyyen Balçikanli ◽  
İbrahim Halil Durmuş ◽  
Erdoğan Özbay ◽  
Mustafa Erdemir
Keyword(s):  
High Temperature ◽  
Temperature Level ◽  
Alkali Activated Slag ◽  
Activated Slag ◽  
Alkali Activated

Strength and Resistance of Alkali-Activated Slag Concrete to High Temperature

2012 ◽  
Vol 193-194 ◽  
pp. 431-434 ◽  
Author(s):  
Mao Chieh Chi ◽  
Ran Huang ◽  
Wei Hsin Lu
Keyword(s):  
Compressive Strength ◽  
High Temperature ◽  
Relative Humidity ◽  
Superior Performance ◽  
Liquid Sodium ◽  
Temperature Resistance ◽  
Alkali Activated Slag ◽  
High Temperature Resistance ◽  
Activated Slag ◽  
Alkali Activated

This study presents an investigation into high-temperature resistance of alkali-activated slag concrete (AASC). Sodium oxide (Na2O) concentrations of 4%, 5% and 6% of slag weight and liquid sodium silicate (SiO2) with modulus ratio of 0.8 ( mass ratio of SiO2 to Na2O ) were used as activators to activate granulated blast furnace slag (GBFS). All cylindrical specimens with the same binder content and liquid/binder ratio of 0.5 were cast and cured in the air, under the saturated limewater and in a curing room at relative humidity of 80% RH and temperature of 60 °C, respectively. Test results demonstrate that the high-temperature resistance of AASC decreased with an increase of temperature. The compressive strength and high-temperature resistance of AASC improved with an increase dosage of Na2O and AASC cured at relative humidity of 80% RH and temperature of 60 °C has the superior performance, followed the AASC by air curing and saturated limewater curing. The higher compressive strength and superior high-temperature resistance have been obtained in AASC than comparable OPC.

scholarly journals Effect of Heat Curing Method on the Mechanical Strength of Alkali-Activated Slag Mortar after High-Temperature Exposure

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1789 ◽  
Author(s):  
Tai Thanh Tran ◽  
Hyuk Kang ◽  
Hyug-Moon Kwon
Keyword(s):  
High Temperature ◽  
Mechanical Strength ◽  
Weight Ratio ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Alkali Activated Slag ◽  
Heat Curing ◽  
Curing Method ◽  
Activated Slag ◽  
Alkali Activated

The aim of this work was to study the mechanical strength and microstructure changes of alkali-activated slag mortar (AAS mortar) after being heat treated in the temperature range of 200–1000 °C. The AAS mortar was cured in the ambient condition (20 ± 5 °C, 60 ± 5% RH) (Relative humidity: RH) and high temperature condition (80 °C) for 27 days with three different heating regimes: curing in a dry oven, curing in sealed plastic bags, and in a steam environment. The activator for the AAS synthesis was a mixture of sodium silicate solution (water glass) and sodium hydroxide (NaOH) with a SiO2/Na2O weight ratio of 1, and a dosage of 4% Na2O by slag weight. Thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) incorporated with energy-dispersive X-ray spectroscopy (EDX) were used to assess the mortar microstructure change. The results revealed that the curing method significantly affected the mechanical strength of AAS at temperatures lower than 800 °C. The heat treatment at late age of 28 days was more beneficial for compressive strength enhancement in specimens without using heat curing methods.

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