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Study on hydration heat and alkali silica reactivity of cast sand ultra high strength concrete

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Document pages: 11 pages

Abstract: This study introduces the hydration reactivity and alkali silica reaction (ASR) of ultra-high strength concrete (uhsc), which is more sustainable through the use of casting waste sand. Waste foundry sand is not only sustainable, but also has the characteristics of auxiliary cementitious material (SCM). Two series of uhsc mixtures were prepared using inactive sand and activated sand (in terms of ASR) to study the effects of active aggregate and waste casting sand. Conduction calorimetry is used to monitor the hydration heat maintained under isothermal conditions, while ASR is studied by accelerated mortar bar test (ambt). In addition, the compressive strength of the two series of mixtures was measured on days 7, 14 and 28 to determine the high strength requirementsts. The compressive strengths ranged from 85 MPa (12,345 psi) to 181.78 MPa (26,365 psi). This result demonstrates that a UHSC mixture was produced. The calorimetry results revealed a slight acceleration in the heat of hydration flow curve compared to the control from both aggregates indicating increased hydration reactivity from the addition of foundry waste. The combination of foundry sand and reactive sand was found to increase ASR reactivity with increasing additions of foundry sand up to 30 replacement.

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