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    Use of concrete wastes as the partial replacement of natural fine aggregates in the production of concrete
    (Springer, 2019) Saha, S.; C, C.; Vinay, K.
    Due to rapid development of construction industries in various dimensions, demand for construction materials is also gaining high momentum. Therefore, availability of natural sources of construction materials is going to be in decreasing trend to cope up with the high demand. Again currently, quantity of construction and demolition waste is also going too high day by day. Reuse of these construction and demolition waste is one of the promising solutions to protect natural fine aggregates. This study aims at investigations the possibility of the usage of these construction and demolition wastes to produce the fresh concrete with desirable properties. Natural fine aggregates (river sand) are replaced by the recycled fine aggregates by the different percentage levels for the production of fresh concrete. A comparative interpretation on the strength characteristics of the concrete produced with Ordinary Portland Cement and Portland Pozzolana Cement is also presented and discussed in this paper. © Springer Nature Singapore Pte Ltd. 2019.
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    Use of foundry sand as partial replacement of natural fine aggregate for the production of concrete
    (Springer, 2019) Saha, S.; C, C.; More, A.P.
    The scarcity of natural fine aggregate becomes prominent in the present scenario due to high consumption of natural fine aggregate as the demand for concrete is increasing day by day. As a result, environmental degradation also becomes very significant. In this experimental study, an effort has been made to study the feasibility of using foundry sand as partial replacement for natural fine aggregate to produce concrete with desired properties. Physical and mechanical properties of the produced concrete were studied by incorporating foundry sand, 10, 20, 30, and 40% of the mass of total fine aggregate in the mixes. For achieving the desired strength of concrete mixes, 30% replacement of natural fine aggregates by foundry sand was observed in this work to be considered for the production of fresh concrete. Use of certain percentage of foundry sand as alternative for natural fine aggregate to produce concrete will lead to protect the natural resources, save the environmental system, and promote sustainability in concrete industries. © Springer Nature Singapore Pte Ltd. 2019.
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    Mechanical Properties and Characterization of Hybrid Composition Reinforced with Natural Fibers
    (Springer, 2024) Dayanand; Bheemanalli, A.; Sangamesh; Gurumurthy, B.M.; Ravishankar, K.S.
    The current work involves fabrication of hybrid composite by using sisal and roselle natural fibers as reinforcing elements or fillers with epoxy resin (LAPOX L12) and Hardener or catalyst (K6) by hand lay-up method with a 35:75 ratio. Enhancement of mechanical properties in polymer hybrid composites is exhibited by the possible intermixture of roselle and sisal fibers [1]. The effect of loose and continuous fiber (CLFR) and woven mat fiber-reinforced (WMFR) hybrid composite laminates were tested to evaluate the mechanical and physical performance exhibited by them. Water absorption test along with thickness swelling test was carried out and the data was recorded for reference. The tensile strength and modulus of WMFR composite (dry) are reduced by 35% and 17%, respectively, and compressive strength and modulus of WMFR composite (dry) are reduced by 17% and 33%, respectively. It was also noticed that Erosion rate of the samples increases as the increase of sand particle size, sand concentration, and erosion rate is high in case CLFR (4.93%) composite. Water absorption is high in CLFR than in WMFR composite. SEM analysis revealed that fiber pull-out, de-bonding, matrix softening, fiber rupture, sliding tracks, debris, and cracks were the reasons for the failure of composites. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.