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Effect of mineral additive use on permeation properties of concrete and the relationship between permeation and carbonation

İlker Ustabaş

Abstract


In this study, effect of fly ash, silica fume and blast furnace slag to the permeation of concrete was investigated. The differences in the absorption, capillary sorption, and ultrasound transmission speed of concrete with and without mineral additives have been studied. Mineral additives have decreased the absorption and sorption of 1-month concrete due to their fine structure by acting as sealant to the pores of concrete. However, when long term (36-month) concrete absorption and sorption is considered, the rate of decrease in permeation of concretes without mineral additives was higher than those with mineral additives because of the effect of carbonation. It was observed that the concrete samples with highest water absorption and capillary water absorption at the 1st month had the lowest water absorption and capillary water absorption at the 36th month. While the permeation of concrete with mineral additives is lower than that of concrete without mineral additives at early-ages (1 month), the permeation of concrete with mineral additives is higher than the concrete without mineral additives at future ages (36 month). The changes in the absorption and sorption of concretes were found to be compatible with the changes in the ultrasound transmission speed.

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References


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