Identification of concrete incompatibilities using Dynamic Shear Rheometer (DSR)
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In concrete, the chemical interactions between chemical admixtures and portland cement is complicated and unpredictable. Occasionally these interactions may cause a serious set retardation or excessively fast stiffening. The objective of this study was to develop a reliable test method to predict potential concrete incompatibilities through the direct measurement of cement paste rheology using a dynamic shear rheometer (DSR). Three cement paste mixtures with different dosage levels of a water reducing admixture were investigated with five different gaps of parallel plates in DSR. An effort was made to define which gap is the most sensitive and representative to identify incompatibilities between cement and chemical admixture at early ages. All the rheological tests were repeated three times to get the coefficient of variation. The results show that tests with lmm plate gap is the most representative to distinguish three studied mixtures based on their rheological parameters with good reproducibility.
