Abstract
Abstract: This study looked at the effects of three types of additives: limestone powder, Arabian gum AG, and polyvinyl alcohol (PVA), on White Cement Mortar's Physical and Mechanical Properties the mixing ratio for dry shrinkage was 1:2. (Cement: sand) while for other tests, it was 1:2.75 (cement: sand). The limestone powder proportions are (5%, 10%, and 15%) by weight of white cement, while the AG ratios are (0.2, 0.5, and 0.8) % by weight of white cement, the polyvinyl alcohol ratios are (2%, 4%, and 6%). This study was focused at the compressive and flexural strength of the modified mortar, as well as water absorption and drying shrinkage. According to the findings, utilizing of limestone powder as additive in white cement mortar is not advised. Since it had the negative affect on dry shrinkage of the mortar. Furthermore, polymer additives such as AG and PVA significantly increase the reduction of ability of forming crack in white cement mortar. Furthermore, the optimal additive percentages of AG and PVA are 0.5 percent and 6%, respectively.
Highlights
In the construction sector, white cement is widely used for aesthetic purposes, but it has a variety of functional applications
The addition of limestone powder is inversely proportional to the value of the Modulus of Rapture (MOR), but when using (AG), the highest value of MOR is obtained when adding 0.5% Arabian gum (AG) and 0.8% wt. of white cement, as well as when adding polyvinyl alcohol, it gives the highest value of MOR when added by 4% wt. of white cement
The following conclusions can be made from the above-mentioned test results: 1. Limestone powder should not be utilized in white cement mortar due to its negative effect on the dry shrinkage property
Summary
White cement is widely used for aesthetic purposes, but it has a variety of functional applications. White cement is utilized in decorative works such as architectural fittings, statues, and terrazzo. Designers and architectural engineers are encouraged to utilize white cement in the mix of ornamental concrete in a variety of sizes and forms since it is known for its flexibility before final setting. For a variety of reasons, white cement concrete is utilized to improve energy efficiency. It is extremely heat reflecting, reducing the requirement for air conditioning in structures. It can improve lighting in open-plan buildings, as a result when white cement concrete is used, the long-term cost of the cooling/heating and lighting systems is lowered. On the internal concrete face, if the concrete cover spalls or surface cracks, less care of the concrete surface is required [1]
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