International Journal of Civil and Structural Engineering Research ISSN 2348-7607 (Online) Vol. 8, Issue 1, pp: (30-39), Month: April 2020 - September 2020, Available at: www.researchpublish.com
Property Characterization of Plaster Mortar Utilizing Sawdust and Rice Hull Ash Vanessa Mae M. Angue1, Charmaine Ericka M. Dela Cruz2, Faye Angel Maeh P. Kahano3,
Jenifer A. Magsino4, Engr. Siva Das P. Abaya5 Department of Civil Engineering, College of Engineering, Computer Studies and Architecture Lyceum of the Philippines University – Cavite, Governor’s Drive, General Trias, Cavite, Philippines 4107
Abstract: The production of cement and extraction of sand has led to long‒term damages to the environment. To alleviate these damages, ways on minimizing usage of cement and sand should be done. For this reason, the purpose of this research is to investigate the effect of reducing the cement and sand content of plaster mortar and partially replaced the two with rice hull ash and sawdust. To assess and evaluate the quality of plaster mortar utilizing sawdust and rice hull ash, a series of test was conducted such as: flow table test, length change test, compressive strength test and a visual inspection of the applied plaster. The method chosen for this study is the experimental method and four (4) mix design ratios were proposed with a 1:4 cement-sand ratio. The results show that the best mix identified within the limitations on this study, is the plaster mortar having a ten percent partial replacement of cement with rice hull ash (by weight) only. This mix design has achieved good workability, has a lower shrinkage percentage and higher compressive strength of 7.13 MPa, in comparison with the control sample. It has a smooth plaster finish and similar color with the ordinary, cement-based plaster. The use of rice hull ash as partial replacement to cement is recommended; not only it minimizes the usage of cement, but also it improves the overall quality of plaster mortar. Keywords: Common byproducts, Plaster Mortar, Property Characterization, Rice Hull Ash, and Sawdust.
I. INTRODUCTION Cement and Sand, being two of the most used construction materials has become a household material in every construction project. The surge in the need of its consumption has resulted in the massive production of it. Meanwhile, the annual extraction of sand is around 40 billion tons, with construction industries as its number one consumer. One way to alleviate this problem is to utilize these solid wastes in construction materials. For the partial replacement of Rice Hull Ash with cement, one study entitled ―Influence of Rice Husk Ash as Supplementary Material in Cement Paste and Concrete‖ showed that that RHA can be appropriately used as a supplementary material in cement paste and concrete preparation, subject to the following considerations; (1) The usage of an optimum mixture of 10% RHA are considered moderate strength concrete or structural concrete and can be used for structural work, (2) RHA prolongs or lengthens the setting time of the concrete thus reduces cracks in the concrete and prevents the abrupt evaporation of heat in massive concrete structures (M. Calica, 2008). Therefore, in this study, the researchers had determined and described the properties of plaster mortar that utilizes sawdust and rice hull ash as partial material replacement in its mixture. The scope and limitations of this study includes the following; (a) cement-sand ratio of 1:4 is used for the mix design of this study; (b) ten percent of the weight of cement per mixing batch will be replaced by rice hull ash; (c) sand will be partially replaced by sawdust in five (5), ten (10) and fifteen (15) percent of the sand’s weight per mixing batch; (d) the application of mortar as plaster on a concrete hollow block will be on two coats. First coat is 12 mm and the second coat is 8 mm; (e) physical and mechanical properties of the plaster mortar include its density, compressive strength, shrinkage strain, as well as the color and texture when applied as plaster; (f) the dimension of the cube samples is 2 in. x 2 in. x 2 in and the dimension of the prism samples were 1 in. x 1 in. x 11.25 in; (g) flow table test is done prior to casting of cube
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