January 14, 2020 Thesis Open Access

DANIEL MAMO

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        "affiliation": "ADDIS ABABA SCIENCE AND TECHNOLOGY UNIVERSITY", 
        "name": "DANIEL MAMO"
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    "description": "<p>Concrete is the most common building material that is used prominently in construction industry. It<br>\ncan be cast in any desired shape and fashion and should be workable whether on- site or in ready mix<br>\nconcrete production. To achieve better performance and desired proprieties of concrete, the use of<br>\nchemical admixtures is priceless choice in concrete production. While, there are common problems<br>\nfacing to optimize superplasticzer dosage with various types of cement to produce desirable<br>\nproperties of fresh and hardened concrete due to lack of practices in construction industry in our<br>\ncountry.<br>\nThe purpose of this research was determining optimum Superplasticizer dosage for desired<br>\nworkability using Marsh Cone Test at pre-determined water cement ratio. It was also analysis the<br>\neffect and influences of Superplasticizer dosage on concrete properties. Slump Cone test and testing<br>\nmachine were used to determine such properties of concrete. The first conclusion that was drawn<br>\nfrom the research was deciding optimum dosage on cement slurry which was prepared using different<br>\ntypes of Super plasticizer and Cements for variable water cement ratio. Secondly, the test were<br>\ncarried out to see effects of Superplasticizer dosage on improvement of workability and flowablity of<br>\nfresh concrete in specified doses. Also, it was also noticed changes of hardened concrete properties<br>\nusing mechanical tests.<br>\nUsing 0.45 and 0.40 water-cement ratio, optimum dosage of Superplasticizer (ODS) has found out,<br>\nwith respect to different Superplasticzers on different brand of cement paste mix.<br>\nSecondly, it also observed the effect of superplasticzer dosage for pre- determined quantity (0.5%,<br>\n1.0%, 1.5% and 2.0%) on hardened concrete strength in addition to fresh concrete characteristics.<br>\nThirdly, the demand of water reduced by 20%, 23%, 27% and 30% from total mix water using<br>\n0.5%,1.0%,1.5% and 2.0% of Superplasticizer respectively in concrete mix.<br>\nGenerally, Superplasticzer is playing vitally role to achieve better physical properties and quality of<br>\nconcrete, and resolving challenges in undesirable conditions during concrete work operations. Despite<br>\nthese facts, over dosage of SP were found to deteriorate the properties of concrete with indication of<br>\nlower compressive strength and higher porosity due to bleeding and segregation occurrences.</p>", 
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    "keywords": [
      "Superplasticizer, dosage, cement, concrete strength, a ready-mixed concrete."
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    "language": "eng", 
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    "publication_date": "2020-01-14", 
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      "supervisors": [
        {
          "affiliation": "ADDIS ABABA SCIENCE AND TECHNOLOGY UNIVERSITY", 
          "name": "BELACHEW ASTERAY (PH.D.)"
        }
      ], 
      "university": "ADDIS ABABA SCIENCE AND TECHNOLOGY"
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    "title": "OPTIMIZATION OF SUPERPLASTICIZER DOSAGE AND EFFECTS WITH LOCALLY PRODUCED CEMENTS ON READY-MIX CONCRETE PROPERTIES"
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