The effects of water/Cement and Sand

Date

3-2011

Degree

Bachelor of Science in Civil Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Marloe B. Sundo

Committee Member

Marish S. Madlangbayan, Ginghis B. Maranan

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Abstract

The incorporation of plastics in concrete has become an object of research for some years now due to the increasing concern on the environment. In the attempt to recycle plastics, a study has been conducted to produce lightweight concrete using polypropylene pellets as substitute to the lightweight aggregate of the concrete. It was found out that compressive and tensile strength decreases with the increase of the percent replacement beyond 50%. In this study, the effects of sand/cement ratio and water/cement ratio on the flexural strength of lightweight concrete with polypropylene has been studied using a fixed aggregate/cement ratio and fixed aggregate replacement of 50%. The sand/cement ratios used were 1.0, 1.5 and 2.0 while the water/cement ratios were 0.4, 0.5 and 0.6. Pumice aggregates were used as the coarse lightweight aggregate. The results showed that at different water/cement ratio, factors governing the concrete strength vary as the porosity of the concrete is dictated by different factors. At low water/cement ratios, the increase in porosity caused by increased sand content governs the strength resulting to the decreases in strength. However, the effect of water content becomes more significant as the water/cement ratio increases. Moreover, at high water/cement ratio (0.6) with high sand/cement ratio (2.0), the concrete tends to behave more like a mortar with very low strength compared to the other mixes. Maximum flexural strength of 2.86 MPa was obtained at water/cement ratio of 0.5 and sand/cement ratio of 2.0 which was also considered to be the most economic mix design.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Document Type

Thesis

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