Browsing by Author "Salman, Ashuara"

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    Influence of Locally Sourced Waste Foundry Sand on Workability and Compressive Strength of Normal-Strength Concrete
    (Afe Babalola University, Ado-Ekiti (ABUAD), 2022) Salman, Ashuara; Akinpelu, Mutiu
    Since the early nineteenth century, sustainable utilization of industrial by-products and agro-residue ashes have been at the forefront of researches owing to the impacts of rapid urbanization and development. This study presents experimental work on the re utilization of already discarded waste foundry sand (WFS) sourced from local iron pot maker in Osogbo, Osun State. Fine aggregate was partially replaced with three different compositions of WFS (0, 10, 20 and 30%) using batching by weight method. The slump cone test was performed on the fresh concrete samples in order to determine their workabilities while the compressive strength test was performed at 7th, 21st and 28th-day curing ages. The compressive strength test is most used to assess the load-bearing capacity of concrete. The hardened densities for the concrete samples were also established at 7th, 21st and 28th-day curing ages. Results from the compressive strength test showed that as more WFS was incorporated into concrete mixes, so does the compressive strength increases across all curing ages. The results also showed a marginal increase in compressive strengths at 28th-day curing age in concrete samples containing WFS. Slump values for the concrete samples increase as more WFS is incorporated into mixes with exception of 30% WFS whose slump value decrease slightly compared to samples containing 10% of WFS. The hardened densities of concrete samples fall within 2200 - 2600kg/m3 which is regarded as the density of normal-weight concrete across all curing ages. Based on these results, WFS sourced locally can effectively and efficiently be utilized to produce plain concrete.
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    Potential Use of Groundnut Shell Ash as Soils Strength Enhancer
    (LAUTECH, 2021) Salman, Ashuara; Akinpelu, Mutiu
    This research investigates the potential use of groundnut shell ash (GSA) as soils strength enhancer. The GSA was used as admixture on selected soil samples from four different locations and samples were named T1, T2, T3 & T4. The tests carried out on the samples include Atterberg limit, sieve size analysis, soil hydrometer, compaction and California bearing ratio (CBR), X-ray fluorescence (XRF). Sieve size analysis, soil hydrometer test, Atterberg limit test were used to classify soil samples’ properties and classification was done as per AASHTO soil classification system. Sample T1 was classified as A-6, samples T2, T3 and T4 were classified as A-4. GSA was added to the soil samples;2, 4, 6, 8, 10 and 15% of GSA by weight of soil samples. Compaction test and California bearing ratio (CBR) were carried out on soil samples with added GSA. Results from XRF showed that SiO2 + Al2O3+ Fe2O3 = 25.61%. For GSA to be classified as pozzolan, SiO2 + Al2O3+ Fe2O3 ≥ 70% as per ASTM C618 – 08. Therefore, GSA cannot be classified as pozzolan as it does not meet requirement stipulated in ASTM C618 but rather as inert pores filler. Based on the results from compaction and CBR, the study showed that 4-8% of GSA was found to have improved and enhanced the strength of the soil samples.