A Study of Setting Time of Cement Paste, Workability and Compressive Strength of Mortar Mixed with Concentrated Latex
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Abstract
The objective of this research is to study the physical and mechanical properties of cement paste and mortar mixed with the Low Ammonia Concentrate Latex (LA-TZ). For physical properties, the normal consistency and the initial setting time of the cement paste samples are determined as well as the workability of the mortar samples. For the mechanical properties, the compressive strength of mortar mixed with concentrated latex are studied at the ages of 3, 7, 14, and 28 days. The replacement ratios of concentrated latex were 0.5, 1.0, 1.5, and 2.0 percent by weight of water. The results of the experiment showed that concentrated latex causes the cement paste to require more water content to obtain the normal consistency condition as well as the increasing of the initial setting time. It also causes the flow value of the mortar to be increased as well. It continues to increase water requirement to maintain the flow value of 110±5 period. It is also found that replacing concentrated latex at a ratio of 1.0 percent by weight of water is the most appropriate replacement rate because it provides the highest compressive strength after the control mixture. The compressive strength of the mortar at the age of 28 days to 29.7 MPa, which is sufficient for general use. Moreover, the initial setting time has been increased to 30 minutes from the control mixture, which makes the operation even more comfortable.
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