Reducing Unplanned Downtime Losses in the Shaft Assembly Process with Overall Effectiveness Measurement
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Abstract
This objective of this research is to study the effects of surfactant on compressive strength and density of para rubber latex concrete. Control concrete having compressive strength of 240 ksc and slump between 7.5 and 12.5 cm was chosen for the mix proportion design methods. Testing specimens was separated into 2 groups. The first group, a partial amount of water in control mixture was replaced by para rubber latex at rates of 0.5, 1.0, 1.5 and 2.0 percent by weight of water. The second group, 5 percent by weight of para rubber latex was replaced by surfactant for every mixture of the first group. For every mixture, slump of fresh concretes was observed. Compressive strength of each mixture was investigated at the ages of 7, 14, and 28 days, respectively. Density of each specimen was calculated using its weight and volume, one-by-one. It was found that surfactant could increase slump of fresh concrete. In addition, the surfactant resulted in a dramatic decline in the compressive strength of para rubber latex concrete, especially for the mixtures containing 1.5 and 2.0 percent of para rubber latex. Those mixtures showed decreases of 32 and 52 percent in comparison with the control concrete. Irrespective of surfactant, the density of para rubber latex concrete exhibits significant relationship with compressive strength of the specimens.
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