January 14, 2020 Thesis Open Access

DANIEL MAMO

MARC21 XML Export

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    <subfield code="u">https://nadre.ethernet.edu.et/record/4499/files/OPTIMIZATION OF SUPERPLASTICIZER DOSAGE AND  EFFECTS WITH LOCALLY PRODUCED CEMENTS.pdf</subfield>
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    <subfield code="a">OPTIMIZATION OF SUPERPLASTICIZER DOSAGE AND EFFECTS WITH LOCALLY PRODUCED CEMENTS ON READY-MIX CONCRETE PROPERTIES</subfield>
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    <subfield code="c">2020-01-14</subfield>
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    <subfield code="a">Superplasticizer, dosage, cement, concrete strength, a ready-mixed concrete.</subfield>
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    <subfield code="a">BELACHEW ASTERAY (PH.D.)</subfield>
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    <subfield code="a">&lt;p&gt;Concrete is the most common building material that is used prominently in construction industry. It&lt;br&gt;
can be cast in any desired shape and fashion and should be workable whether on- site or in ready mix&lt;br&gt;
concrete production. To achieve better performance and desired proprieties of concrete, the use of&lt;br&gt;
chemical admixtures is priceless choice in concrete production. While, there are common problems&lt;br&gt;
facing to optimize superplasticzer dosage with various types of cement to produce desirable&lt;br&gt;
properties of fresh and hardened concrete due to lack of practices in construction industry in our&lt;br&gt;
country.&lt;br&gt;
The purpose of this research was determining optimum Superplasticizer dosage for desired&lt;br&gt;
workability using Marsh Cone Test at pre-determined water cement ratio. It was also analysis the&lt;br&gt;
effect and influences of Superplasticizer dosage on concrete properties. Slump Cone test and testing&lt;br&gt;
machine were used to determine such properties of concrete. The first conclusion that was drawn&lt;br&gt;
from the research was deciding optimum dosage on cement slurry which was prepared using different&lt;br&gt;
types of Super plasticizer and Cements for variable water cement ratio. Secondly, the test were&lt;br&gt;
carried out to see effects of Superplasticizer dosage on improvement of workability and flowablity of&lt;br&gt;
fresh concrete in specified doses. Also, it was also noticed changes of hardened concrete properties&lt;br&gt;
using mechanical tests.&lt;br&gt;
Using 0.45 and 0.40 water-cement ratio, optimum dosage of Superplasticizer (ODS) has found out,&lt;br&gt;
with respect to different Superplasticzers on different brand of cement paste mix.&lt;br&gt;
Secondly, it also observed the effect of superplasticzer dosage for pre- determined quantity (0.5%,&lt;br&gt;
1.0%, 1.5% and 2.0%) on hardened concrete strength in addition to fresh concrete characteristics.&lt;br&gt;
Thirdly, the demand of water reduced by 20%, 23%, 27% and 30% from total mix water using&lt;br&gt;
0.5%,1.0%,1.5% and 2.0% of Superplasticizer respectively in concrete mix.&lt;br&gt;
Generally, Superplasticzer is playing vitally role to achieve better physical properties and quality of&lt;br&gt;
concrete, and resolving challenges in undesirable conditions during concrete work operations. Despite&lt;br&gt;
these facts, over dosage of SP were found to deteriorate the properties of concrete with indication of&lt;br&gt;
lower compressive strength and higher porosity due to bleeding and segregation occurrences.&lt;/p&gt;</subfield>
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