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Bashir Ahmed Memon
Civil Engineering Department, Quaid-e-Awam University of Engineering Science & Technology Nawabshah, Sindh,
Civil Engineering, Building, Construction & Architecture

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Effect of Mould Size on Compressive Strength of Green Concrete Cubes Bashir Ahmed Memon; Mahboob Oad; Abdul Hafeez Buller; Sajjad Ahmed Shar; Abdul Salam Buller; Fahad-u-Rehman Abro
Civil Engineering Journal Vol 5, No 5 (2019): May
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (670.698 KB) | DOI: 10.28991/cej-2019-03091322

Abstract

This paper is aimed to evaluate the effect of mould size on compressive strength of concrete cubes made with recyclable concrete aggregates. Natural coarse aggregates were replaced with 50% recycled aggregates from old demolished concrete. Five different mould sizes were used to cast 420 concrete cubes using 1:2:4 mix and 0.55 water/cement ratio. In each size equal number of cubes was cured for 3, 7, 14 and 28-day. After curing, weight of cubes was determined followed by testing for compressive strength in universal load testing machine with gradually increasing load. From the obtained results the strength correction coefficients were computed keeping 28-day cured standard size cubes as control specimens. Also, numerical expression based on regression analysis was developed to predict the compressive strength using weight of cube, area of mould and curing age as input parameter. The numerical equation predicts the compressive strength very well with maximum of 10.86% error with respect to experimental results. 
Effect of Fly Ash and Un-crushed Coarse Aggregates on Characteristics of SCC Muneeb Ayoub Memon; Noor Ahmed Memon; Bashir Ahmed Memon
Civil Engineering Journal Vol 6, No 4 (2020): April
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/cej-2020-03091501

Abstract

This research paper discusses the change in the workability and strength characteristics of Self Compacting Concrete (SCC) due to addition of fly-ash and use of un-crushed Coarse Aggregate (CA). Laboratory based experimental work was carried out by preparing 12 SCC mixtures among which six mixtures contained crushed aggregate and other six mixtures contained un-crushed coarse aggregate. A total of 550 kg/m3 binder content and fixed Water-Binder (W/B) ratio as 0.35 were used. Two mixtures were controlled by using Portland Cement (PC) and other ten mixtures contained PC and Fly Ash (FA). Slump flow time, slump flow diameter and J-ring height tests were conducted to study the fresh properties of SCC. Furthermore, compressive strength was calculated at 7, 14 and 28 days of curing. The outcomes indicated that the slump flow time, slump flow diameter and J-Ring height for all the mixes are within the limits specified by EFNARC guidelines. The compressive strength of SCCs depends upon dosage of fly ash. Compressive strength for SCCs with crushed CA was better than obtained in case of un-crushed CA. The maximum compressive-strengths were observed as 64.58 MPa and 58.05 MPa for SCC with crushed and un-crushed CA respectively.
Co-Authors Abdul Hafeez Buller Abdul Salam Buller Fahad-u-Rehman Abro Mahboob Oad Muneeb Ayoub Memon Noor Ahmed Memon Sajjad Ahmed Shar