Effect of slaked lime and ALUMINUM SULFATE (cas 16828-11-8) on the properties of dry-mixed masonry mortar

Add time:07/22/2019    Source:sciencedirect.com

There are some drawbacks, such as bleeding, poor cohesiveness, etc, because the water to cement (W/C) ratio of dry-mixed masonry mortar is greater. Therefore, the influences of the slaked lime and ALUMINUM SULFATE (cas 16828-11-8) on performances of masonry mortar were studied. The results show that the optimum ratio of slaked lime to aluminum sulfate by weight is 5–1, and the consistency, bleeding and strength of the mortar can be better improved by the two compounds. The consistency increases by 12.3%, the bleeding water decreases by 6.1% and 28d compressive strength of mortar increases by 27.3% when the content of compound admixture is 6 wt%. The results of SEM, XRD and TG-DTA show that the amount of AFt and C-S-H is changed by the slaked lime and aluminum sulfate, the hydration products and hardened structures are optimized by the compound admixture, and the performances of mortar are improved. This is a good reference value for the performance improvement of masonry mortar.

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