Compressive strength slightly reduced

The data available on the effect of accelerators on the flexural and tensile strengths and the modulus of elasticity are limited [22, 30, 31] and are relevant only to calcium chloride and triethanolamine. The data generally point to either no effect or a slight reduction in all three properties. Also, in view of the increase in compressive strength, it is reasonable to assume that for a given compressive strength, the presence of calcium chloride or triethanolamine will reduce the flexural and tensile strengths and the modulus of elasticity. 

It is noted that the addition of certain additives slightly decreases the concrete strength, despite its positive effects. Early studies found that the addition of air-entraining admixture reduces the concrete s compressive and tensile strength (HRB 1971 Teychenne et al. 1975). The average reduction on the concrete s compressive and tensile strength was found to be at the 5% and 4% level, respectively, for every 1% by volume of additive in the mixture (Teychenne et al. 1975). 

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