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All Journal INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY Indonesian Journal of Construction Engineering and Sustainable Development
Amiri, Ouali
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Energy Environmental Science

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INVESTIGATION OF MECHANICAL CHARACTERISTICS OF LIGHTWEIGHT CONCRETE USING ENVIRONMENTALLY FRIENDLY LIGHTWEIGHT AGGREGATES Nelfia, Lisa Oksri; Sekarningtyas, Nazifa; Sumarno, Agung; Rinanti, Astri; Amiri, Ouali
INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY VOLUME 7, NUMBER 2, OCTOBER 2024
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/urbanenvirotech.v7i2.19715

Abstract

This study aims to investigate the mechanical properties of lightweight concrete using lightweight aggregate and analyze the impact of silica fume on enhancing its compressive strength. The main objective of this study was to improve the value of industrial waste by utilizing GGBFS as a substitute for cement. Four alternative compositions have been used to produce samples of lightweight concrete. The coarse aggregate is substituted with 100% lightweight expanded clay aggregate, whereas the fine aggregates are replaced with 100% vermiculite and 100% polystyrene bead waste.                                A combination of 20% GGBFS and 10% silica fume is employed for cement replacement. The materials used throughout this study consist of aluminum powder and superplasticizer. The workability, compressive strength, tensile strength, and specific gravity of concrete will be determined by testing.                  The waster curing will be carried out on cylindrical concrete specimens 200 mm in height and 100 mm in diameter. Experimental results showed that the concrete mixture consisting of 80% cement and 20% GGBFS as binders, along with lightweight expanded clay aggregate as coarse aggregate and vermiculite as the fine aggregate, exhibits the highest compressive strength compared to other lightweight concrete mixtures.
REVIEW OF THE USE OF BACTERIA AS A HEALING AGENT IN HIGH STRENGTH CONCRETE Putra Ardhani, Rifki Rezkya; Oksri Nelfia, Lisa; Amiri, Ouali
INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CESD) Vol 8 No 1 (2025): INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CESD)
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/cesd.v8i1.24139

Abstract

The need for high quality concrete continues to increase along with infrastructure growth in Indonesia. However, high quality concrete is more brittle and susceptible to cracking. One innovative solution to overcome this problem is the application of self-healing concrete technology by utilizing bacteria as healing agents. This research is a literature review that discusses the use of bacteria such as Bacillus megaterium, Staphylococcus sp., and Solibacillus as self-healing agents in high quality concrete. This bacteria is able to produce the urease enzyme which triggers the formation of calcium carbonate (CaCO₃), which then fills micro cracks in concrete, thereby increasing the density and compressive strength of the concrete. Based on the studies reviewed, the addition of encapsulated bacteria, either as a partial replacement for coarse aggregate or mixed with water, can increase compressive strength by more than 12% compared to control concrete. This research concludes that the use of bacteria as self-healing agents has great potential in increasing the durability and structural performance of high quality concrete in a sustainable manner.
Co-Authors Astri Rinanti Nelfia, Lisa Oksri Oksri Nelfia, Lisa Putra Ardhani, Rifki Rezkya Sekarningtyas, Nazifa Sumarno, Agung