Effect of sand content and water content on the tensile strength of type 1P Portland cement lightweight concrete using pumice and polyethylene pellets as aggregates

Date

3-2011

Degree

Bachelor of Science in Civil Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Marlou B. Sundo

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Abstract

More recently, many studies has been geared towards converting of waste material by-products into useful materials as aggregate in the concrete industry. It is therefore the aim of this study top evaluate the possibility of polypropylene as aggregate in the production of concrete while mixed with volcanic pumice as the main aggregate and varying the sand to cement and water to cement ratio of the lightweight concrete. This paper handles potential tensile characteristics of a lightweight aggregate concrete consisting of Type IP Portland cement, water, river sand, volcanic pumice and polypropylene pellets. It is also the main purpose of this study to investigate the effect of sand content and water content in the tensile capacity of the lightweight aggregate concrete. A total of 27 cylindrical specimens of standard size were prepared in this study for the analysis of its tensile strength property of concrete. These specimens were cured at a same curing period of 28 days for all the specimens. Water to cement ratio is varied at 0.4 and 0.6 while sand to cement ratio is varied at 1.0, 1.5 and 2.0. Physical and chemical properties of the materials used in the study is also provided for more rigid discussion in the resulting behavior of the lightweight aggregate concrete given the parameters and under different variations. The result showed a considerable increase of 30% in the tensile strength of the lightweight aggregate concrete while decreasing the water to cement ratio. Also, a 35% average increase in the tensile strength of the concrete was also observed while increasing the sand of the concrete. It was also observed that the strength of the volcanic pumice and the bond between the cement matrix and the polypropylene pellets resulted to a low tensile strength of the lightweight concrete compared to the conventional concrete mix. The poor bond is caused by the smooth surface of the pellets and thus weakening the interfacial transition zone (ITZ). This fundamental thesis paper is equipped to illustrate activities and progress in the study of lightweight aggregate concrete.

Language

English

LC Subject

Concrete--Additives, Concrete--Testing, Controlled low-strength materials, Pumice, Polypropylene, Aggregates (Building materials)

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993.5 2011 E63 V37

Document Type

Thesis

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