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CONCRETEClass 1:4

Alkali-Silica Reaction (ASR) in Concrete

Thursday, 08 May 2025

Presenter: Ms. Janina P. Kanjee, University of the Witwatersrand

This class explores Alkali-Silica Reaction (ASR)—a chemical process that can lead to the deterioration of concrete. ASR occurs when “reactive” silica in certain aggregates reacts with alkali hydroxides present in the concrete’s pore solution. In the presence of moisture, this reaction forms an expansive gel that exerts internal pressure, leading to cracking and deformation. Over time, ASR can significantly compromise the durability and structural integrity of concrete structures.

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Upcoming CONCRETEClass Events

CONCRETEClass 1 - BACK TO BASICS - ALL EPISODES

S1: E1 - Concrete Mix Design according to Fulton’s Concrete Technology, 10th Edition

Thursday, 6 February 2025

Presenter: Prof Billy Boshoff from the University of Pretoria

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S1: E2 - Concrete Durability – Deterioration Mechanisms and Basic Design Rules

Thursday, 6 March 2025

Presenter: Prof. Hans Beushausen, University of Cape Town

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S1: E3 - Aggregates in concrete – an appreciation of their role

Thursday, 10 April 2025

Presenter: Prof. Mark Alexander, University of Cape Town

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S1: E4 - Alkali-Silica Reaction (ASR) in Concrete

Thursday, 8 May 2025

Presenter: Ms. Janina P. Kanjee, University of the Witwatersrand

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