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  Maturity Modelling for Non-Destructive Strength Development Monitoring of Wet-Mix Sprayed Concrete

  Early-age strength development monitoring of sprayed concrete is an important aspect of conventional tunnelling. Current strength monitoring practices use destructive type testing, namely stud-driving and core testing. The testing requires direct and recurring access to active construction zones, posing safety concerns for testing operatives. Thus, there is a need to establish a non-destructive and safer testing approach. “Maturity method” is a proven non-destructive approach for the early-age strength monitoring of concrete. It involves evaluating the thermal history of concrete for modelling the maturity development and use mix-specific pre-established strength – maturity relationship to estimate strength development. Since thermal monitoring does not necessarily require direct and recurring access to an active construction zone, the approach is safer than the current practices. This paper focuses on the use of an Arrhenius equation-based maturity function for the maturity modelling of sprayed concrete. The maturity function input parameters, namely activation energy and normalised kinetics, are established through the isothermal calorimetry of a wet-mix sprayed concrete based blended cement pastes. The paper also concludes on the thermal monitoring guideline for appropriate application of the maturity function.

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