Construction and Mining applications of 60% - 100 % Portland cement replaced ASH-based concrete in South Afr.pdf

Cyril Attwell, ARC Innovations

Description

Construction and Mining applications of 60% - 100 % Portland cement replaced ASH-based concrete in South Africa Authors Mr. Cyril Attwell - South Africa - ARC Innovations Abstract Keywords: Alkali-activation, coal ash, shotcrete, ash stabilisation Abstract The growing adoption of AAM, (alkali-activated material), derived from coal combustion residue (coal ash), in international mining and construction industries stems from its adaptability to diverse project requirements. Key considerations include material application at extreme depths (4-5 km), exposure to rock temperatures exceeding 50°C, extended open time of mixed material (up to 30 days), high early strength, and effective energy absorption. Formulation challenges encompass factors such as on-site material availability, required setting times, and compressive strength specifications for distinct projects. AAM integrates coal ash and slag, employing worker-friendly activators in cost-effective quantities (up to 4%) to create an environmentally responsible alkali-activated material concrete. This approach distinguishes itself when compared to both conventional geopolymers and normal Portland cement concrete. The distinctive properties of alkali-activated materials extend their utility beyond that of normal Portland cement concrete in global mining and construction applications. Alkali-activated materials emerge as a viable choice not only for in-situ casting but also for precast applications such as culverts, where materials demand high corrosion resistance and durability. This presentation sheds light on the versatility and advantages of alkali-activated materials in meeting the specific needs of diverse projects on an international scale.

 
May 15th, 1:30 PM May 15th, 2:00 PM

Construction and Mining applications of 60% - 100 % Portland cement replaced ASH-based concrete in South Afr.pdf

Grand Rapids, Michigan

Construction and Mining applications of 60% - 100 % Portland cement replaced ASH-based concrete in South Africa Authors Mr. Cyril Attwell - South Africa - ARC Innovations Abstract Keywords: Alkali-activation, coal ash, shotcrete, ash stabilisation Abstract The growing adoption of AAM, (alkali-activated material), derived from coal combustion residue (coal ash), in international mining and construction industries stems from its adaptability to diverse project requirements. Key considerations include material application at extreme depths (4-5 km), exposure to rock temperatures exceeding 50°C, extended open time of mixed material (up to 30 days), high early strength, and effective energy absorption. Formulation challenges encompass factors such as on-site material availability, required setting times, and compressive strength specifications for distinct projects. AAM integrates coal ash and slag, employing worker-friendly activators in cost-effective quantities (up to 4%) to create an environmentally responsible alkali-activated material concrete. This approach distinguishes itself when compared to both conventional geopolymers and normal Portland cement concrete. The distinctive properties of alkali-activated materials extend their utility beyond that of normal Portland cement concrete in global mining and construction applications. Alkali-activated materials emerge as a viable choice not only for in-situ casting but also for precast applications such as culverts, where materials demand high corrosion resistance and durability. This presentation sheds light on the versatility and advantages of alkali-activated materials in meeting the specific needs of diverse projects on an international scale.