Predicting chloride content profile in concrete using a concrete mix design parameter

摘要

Many service life prediction models for concrete require information from existing structure, for example, chloride concentration value at a known depth in concrete and the period of chloride exposure before a prediction can be made. Those models are useful when dealing with service life of existing concrete structures. In the case of designing a new concrete structure for service life, the prediction may be hindered because the required field information is not available at the time of design. Hence, a model which can give an estimate of the service life of a structure at the design stage is necessary. In the present study, a chloride concentration prediction model based on a concrete mix design parameter is proposed. The model is developed based on results of chloride immersion tests conducted in a controlled laboratory environment. The model is verified using data obtained from the present study and from the literature. The model can reasonably predict the chloride concentration profile in Ordinary Portland Cement (OPC) concretes having a water to cement ratio between 0.40 and 0.67.