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Subject: search.filters.subject.fine aggregate

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    PublicationOpen Access
    Evaluation of Mechanical Characteristics of Rice-Husk-Bricks
    (SLIIT, Faculty of Engineering, 2023-10) Tilakasena, R.S; Tharmarajah, G
    Construction activities and materials extraction are major contributors to environmental pollution. To address this issue, the utilization of bio-based materials presents a promising sustainable alternative for the construction industry. Bio-based materials encompass a broad category of organic matter that can be either synthesized or naturally derived. One such noteworthy bio-based material is rice husk, which exhibits pozzolanic properties. Abundantly available as an agricultural waste product, rice husk holds potential as a viable substitute in construction processes. This study is dedicated to investigating the feasibility of replacing fine aggregates, traditionally comprised of sand, in cement blocks with untreated rice husk on a volumetric basis. In contrast to being used merely as an additive, this research delves into the possibility of substantially replacing sand with a higher proportion of rice husk, ranging from 20% to 80%, in the composition of cement blocks. The findings of this study reveal that up to 40% of the sand content in cement blocks can be effectively replaced with untreated rice husk while still meeting the requisite strength standards for non-load bearing blocks. Moreover, this study demonstrates an additional advantage in terms of weight reduction. Substituting sand with rice husk leads to a remarkable 30% reduction in the overall weight of the blocks. These results underscore the potential benefits of integrating rice husk into construction materials as an environmentally friendly and weight-efficient alternative.
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    PublicationOpen Access
    EFFECT OF PORCELAIN WASTE AS A FINE AGGREGATE ON THE MECHANICAL PROPERTIES OF CONCRETE
    (University of Peradeniya, 2019-08-13) Kobbekaduwa, K. W. D; Perera, S. V. T
    The demand for concrete keeps significantly increasing worldwide throughout the past few years period. The exponential development rate and construction processes on developing infrastructure facilities all over the globe has resulted this situation. As an outcome of that, the excessive production of concrete has led to several environmental impacts all around the world. This study investigated the suitability of crushed porcelain waste as a replacement for fine aggregates by analysing the strength gains and other mechanical properties depending on the replaced proportions. Porcelain Waste Fine Aggregate (PWFA) which is a low water absorbing material was used in replacing conventional fine aggregates in the proportions of 25%, 50%, 75%, 85% and 100% for the concrete of Grade 30. It was found that the most suitable and economical replacement proportion of PWFA is the 75% mix as it comprised a 28-day compressive strength of 54.31 MPa which is 50% greater than the compressive strength of control mixture. Due to the higher strength, the 75% PWFA Grade 30 mix can be implemented as Grade 45 concrete which can save up to 10% of the cost. The partial replacement of sand using PWFA significantly improved the performance of concrete while addressing several environmental and economic issues related to concrete industry.