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Author: search.filters.author.Nawaz, AdnanSubject: search.filters.subject.Mechanical properties

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    Synergizing Portland Cement, high-volume fly ash and calcined calcium carbonate in producing self-compacting concrete: A comprehensive investigation of rheological, mechanical, and microstructural properties
    (2024-12-01)
    Saingam, Panumas
    ;
    Chatveera, Burachat
    ;
    Promsawat, Pongsakon
    ;
    Hussain, Qudeer
    ;
    Nawaz, Adnan
    The manufacturing of Ordinary Portland Cement (OPC) is one of the primary contributors to atmospheric CO<inf>2</inf>. The use of high-volume OPC replacement materials in self-compacting concrete (SCC) has been the focus of several investigations owing to the increased demand for environmentally friendly building materials. This paper presents the experimental investigation of the properties of SCC, where 25–70 % OPC was replaced with fly ash and calcined calcium carbonate (BCC). Different experimental tests, such as workability, mechanical properties, durability, and microstructural characteristics, have been carried out. The test results of workability showed that all the mixes were conforming to satisfactory conditions of EFNARC for the T500 flow timings within the range from 2.50 to 4.55 seconds and slump flow values within the range from 650 to 800 mm. This mix, here called 20F5C, had optimum behaviour with its 91-day compressive strength of 73.8 MPa, a gain of 7.7 % over the control. Replacement ratio, microstructure, and mechanical properties were correlated. Even high-replacement mixes like 50F20C provided a 91-day compressive strength of 58.9 MPa. This clearly shows the prospect of a considerable reduction in cement consumption while maintaining structural integrity. These results indicate the possibility of reduced OPC consumption in concrete production, which again identifies low carbon emission and utilization of waste according to international sustainability goals. The findings have revealed that SCC made with high-volume replacements of OPC could be an economically viable and environmentally friendly solution for the construction industry worldwide.
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    Effect of para-wood ash and calcium carbonate on the properties of eco-friendly self-compacting mortar reinforced with electronic waste fibers
    (2024-10-15)
    Makul, Natt
    ;
    Hussain, Qudeer
    ;
    Nawaz, Adnan
    ;
    Saingam, Panumas
    ;
    Sua-iam, Gritsada
    This paper deals with reducing CO<inf>2</inf> emissions from cement production and finding alternative uses for electronic waste (E-waste) fibers in some innovative applications in self-compacting mortar (SCM). In the present research, an attempt has been made to establish the optimum incorporation of E-waste fiber into SCM by varying the fiber content from 5 % to 25 %, combined with para-wood ash and calcium carbonate as supplementary cementitious materials. In this laboratory study, the mix design had a constant water-to-powder ratio of 0.35 and a cement content of 550 kg/m³. Additionally, 20 % of the cement volume was replaced by 10 % para-wood ash and 10 % calcium carbonate. The results indicated a continuous increase of the mini-slump values from 255 mm for the control mix to 270 mm for the mix with the highest fiber content. Mini V-funnel flow times increased from 3.63 to 8.83 s as the fiber content increased. Lower fiber contents of 5 % improved compressive strength because they had a reinforcing role in the matrix of SCM besides the microcrack-bridging role. Higher contents of 10–25 % decreased the strength due to the clustering of fibers and resulting voids. SEM analysis at 28 days showed increased voids with higher percentages of E-waste fibers and para-wood ash alone. The results underline that optimizing fiber content is critical in balancing workability and mechanical properties, and 5 % e-waste fiber content can be considered optimal for enhancing the performance of SCM. This work also creates part of sustainable construction practice with the green solution required to reduce CO<inf>2</inf> emissions and work accumulation against E-waste.