Study on calcium dissolution behavior of manufactured sand concrete

AbstractThe accelerated calcium dissolution tests of concrete with different replacement rates of manufactured sand (ρms) and different contents of stone powder (ρsp) were carried out using the ammonium chloride solution. The results show that the dissolution resistance of manufactured sand concrete (MSC) is higher than that of ordinary concrete, although the ρms and ρsp influence its physical and mechanical properties. When the ρms is low, the mass loss ratio and dissolution depth of MSC after dissolution both increase with the increasing ρsp. They also increase with the increasing of ρms, but the ρsp no longer influences them when the ρms is high. The ρsp corresponding to the maximum ultrasonic velocity of MSC is different for the various ρms. The addition of manufactured sand inhibits the reduction of the compressive strength after dissolution, while stone powder has no significant impact on this. Finally, the fitting model of dissolution depth and prediction model of compressive strength of MSC after dissolution are established.Keywords: Manufactured sand concretecalcium dissolutionphysical propertiesmechanical propertiesprediction model Disclosure statementNo potential conflict of interest was reported by the author(s).Data availability statementDue to the nature of this research, participants of this study did not agree for their data to be shared publicly, so supporting data is not available.Additional informationFundingThe authors wish to acknowledge the financial support from the National Natural Science Foundation of China [Grant No. 51408192] and the Fundamental Research Fund for the Central Universities [No. B200202232].