Analysis of the Combined Usage of Plasticizer and Accelerator Effects on Microstructure for Mortar
Keywords:admixture, mortar, compressive strenght, cement
During the production process of mortar many of additives can be used jointly to obtain efficient workability properties. In this situation strenght of mortar depends on the correct ratio of admixtures. This study focuses on analysing of mortar samples that have three different doses of sodium lignosulphonate based plasticizer (%1 -1,5-3) and calciumnitrate based set accelerator (%0,5-1-2) admixture combinations. The water-cement ratio is selected as 0.50 for the mortar production.Various effects in the strenght and durability are investigated by experimental methods. Scanning electron microscope (SEM) images were obtained at the range of magnification 500x to 4000x for observations. In the investigation unit weight, ultrasonic pulse velocity, compressive strenght, setting time tests and microstructure analysis tests were performed in three different dosage mixtures and the obtained data were evaluated. As a result of the tests carried out, the use of the admixtures in different dosages caused decreasement in compressive strenght maximum 7,27 MPa in 28 day samples. It has been observed that %1 plasticizer and %0,5 accelerator combination which has the minimum doses reach the highest compressive strenght for 28 days (39,8 MPa). Therefore, as a result the coexistence of additives must be sensitively controlled and the required dosage adjustments must be made in production.
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