Thesis Open Access
DANIEL MAMO
<?xml version='1.0' encoding='UTF-8'?> <record xmlns="http://www.loc.gov/MARC21/slim"> <leader>00000nam##2200000uu#4500</leader> <datafield tag="041" ind1=" " ind2=" "> <subfield code="a">eng</subfield> </datafield> <datafield tag="980" ind1=" " ind2=" "> <subfield code="a">publication</subfield> <subfield code="b">thesis</subfield> </datafield> <datafield tag="653" ind1=" " ind2=" "> <subfield code="a">Superplasticizer, dosage, cement, concrete strength, a ready-mixed concrete.</subfield> </datafield> <datafield tag="856" ind1="4" ind2=" "> <subfield code="s">3922407</subfield> <subfield code="u">https://nadre.ethernet.edu.et/record/4499/files/OPTIMIZATION OF SUPERPLASTICIZER DOSAGE AND EFFECTS WITH LOCALLY PRODUCED CEMENTS.pdf</subfield> <subfield code="z">md5:1f0a833159e7f609c8f4c763f89f2332</subfield> </datafield> <datafield tag="520" ind1=" " ind2=" "> <subfield code="a"><p>Concrete is the most common building material that is used prominently in construction industry. It<br> can be cast in any desired shape and fashion and should be workable whether on- site or in ready mix<br> concrete production. To achieve better performance and desired proprieties of concrete, the use of<br> chemical admixtures is priceless choice in concrete production. While, there are common problems<br> facing to optimize superplasticzer dosage with various types of cement to produce desirable<br> properties of fresh and hardened concrete due to lack of practices in construction industry in our<br> country.<br> The purpose of this research was determining optimum Superplasticizer dosage for desired<br> workability using Marsh Cone Test at pre-determined water cement ratio. It was also analysis the<br> effect and influences of Superplasticizer dosage on concrete properties. Slump Cone test and testing<br> machine were used to determine such properties of concrete. The first conclusion that was drawn<br> from the research was deciding optimum dosage on cement slurry which was prepared using different<br> types of Super plasticizer and Cements for variable water cement ratio. Secondly, the test were<br> carried out to see effects of Superplasticizer dosage on improvement of workability and flowablity of<br> fresh concrete in specified doses. Also, it was also noticed changes of hardened concrete properties<br> using mechanical tests.<br> Using 0.45 and 0.40 water-cement ratio, optimum dosage of Superplasticizer (ODS) has found out,<br> with respect to different Superplasticzers on different brand of cement paste mix.<br> Secondly, it also observed the effect of superplasticzer dosage for pre- determined quantity (0.5%,<br> 1.0%, 1.5% and 2.0%) on hardened concrete strength in addition to fresh concrete characteristics.<br> Thirdly, the demand of water reduced by 20%, 23%, 27% and 30% from total mix water using<br> 0.5%,1.0%,1.5% and 2.0% of Superplasticizer respectively in concrete mix.<br> Generally, Superplasticzer is playing vitally role to achieve better physical properties and quality of<br> concrete, and resolving challenges in undesirable conditions during concrete work operations. Despite<br> these facts, over dosage of SP were found to deteriorate the properties of concrete with indication of<br> lower compressive strength and higher porosity due to bleeding and segregation occurrences.</p></subfield> </datafield> <controlfield tag="001">4499</controlfield> <datafield tag="100" ind1=" " ind2=" "> <subfield code="a">DANIEL MAMO</subfield> <subfield code="u">ADDIS ABABA SCIENCE AND TECHNOLOGY UNIVERSITY</subfield> </datafield> <datafield tag="245" ind1=" " ind2=" "> <subfield code="a">OPTIMIZATION OF SUPERPLASTICIZER DOSAGE AND EFFECTS WITH LOCALLY PRODUCED CEMENTS ON READY-MIX CONCRETE PROPERTIES</subfield> </datafield> <controlfield tag="005">20200213093454.0</controlfield> <datafield tag="650" ind1="1" ind2="7"> <subfield code="a">cc-by</subfield> <subfield code="2">opendefinition.org</subfield> </datafield> <datafield tag="260" ind1=" " ind2=" "> <subfield code="c">2020-01-14</subfield> </datafield> <datafield tag="542" ind1=" " ind2=" "> <subfield code="l">open</subfield> </datafield> <datafield tag="980" ind1=" " ind2=" "> <subfield code="a">user-aastu</subfield> </datafield> <datafield tag="980" ind1=" " ind2=" "> <subfield code="a">user-nadre</subfield> </datafield> <datafield tag="773" ind1=" " ind2=" "> <subfield code="a">10.20372/nadre/4498</subfield> <subfield code="i">isVersionOf</subfield> <subfield code="n">doi</subfield> </datafield> <datafield tag="502" ind1=" " ind2=" "> <subfield code="c">ADDIS ABABA SCIENCE AND TECHNOLOGY</subfield> </datafield> <datafield tag="024" ind1=" " ind2=" "> <subfield code="a">10.20372/nadre/4499</subfield> <subfield code="2">doi</subfield> </datafield> <datafield tag="540" ind1=" " ind2=" "> <subfield code="u">http://www.opendefinition.org/licenses/cc-by</subfield> <subfield code="a">Creative Commons Attribution</subfield> </datafield> <datafield tag="700" ind1=" " ind2=" "> <subfield code="a">BELACHEW ASTERAY (PH.D.)</subfield> <subfield code="u">ADDIS ABABA SCIENCE AND TECHNOLOGY UNIVERSITY</subfield> <subfield code="4">ths</subfield> </datafield> </record>
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