Browsing by Author "Umair Ahmed Qureshi"

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    A comparative study on strength
    (UMT. Lahore, 2025) Ali Riaz; Umair Ahmed Qureshi; Muhammad UmerRafique; Shah Khalid
    Concrete is one of the most commonly used construction materials, and its properties can be modified using additives like air-entraining agents (AEAs) and supplementary cementitious materials. This study focuses on the effects of AE192, an air-entraining agent, on the mechanical and physical characteristics of ceramic concrete blocks, comparing them to traditional first-class bricks. The objective was to evaluate how different percentages of AE192 (5%, 8%, and 10%) influence compressive strength, weight, and workability, while also incorporating fly ash and ceramic powder for sustainability. A 1:2:4 mix design was used, with Bestway OPC Grade 43 cement, Lawrencepur sand, and 9.5 mm coarse aggregate. Fly ash replaced 20% of cement, and ceramic powder replaced 15% of sand. Two sample sets were tested at 7, 14, and 28 days for compressive strength and weight, following ASTM standards for slump, specific gravity, bulk density, and compression testing. Results showed the control mix (0% AE192) had the highest compressive strength (2030.56 PSI in Sample 1 and 1269.44 PSI in Sample 2), making it suitable for structural applications. The 5% AE192 mix showed balanced strength and reduced weight (1841.67 PSI and 733.33 PSI), making it ideal for semi- structural use. Higher AE192 levels (8% and 10%) led to reduced strength but improved workability and freeze-thaw resistance, useful for non-structural applications. Ceramic- enhanced blocks, especially with 10% ceramic powder, achieved 1186.11 PSI, offering a sustainable option. Although first-class bricks had higher strength, they were less sustainable. The study concludes that 5% AE192 offers an optimal balance of strength, workability, and sustainability.