Thesis Open Access

Water Reducing and Retarding Admixture Effect on the Mechanical Properties of Ready Mixed Concrete

Yordanose Mogse


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  <identifier identifierType="DOI">10.20372/nadre/20234</identifier>
  <creators>
    <creator>
      <creatorName>Yordanose Mogse</creatorName>
      <affiliation>Addis Ababa Science &amp; Technology University</affiliation>
    </creator>
  </creators>
  <titles>
    <title>Water Reducing and Retarding Admixture Effect on the Mechanical Properties of Ready Mixed Concrete</title>
  </titles>
  <publisher>National Academic Digital Repository of Ethiopia</publisher>
  <publicationYear>2018</publicationYear>
  <subjects>
    <subject>Concrete, WRR, Admixture, Compressive Strength, Workability and Permeability</subject>
  </subjects>
  <contributors>
    <contributor contributorType="Supervisor">
      <contributorName>Habtamu Hailu  ( PhD )</contributorName>
      <affiliation>Addis Ababa Science &amp; Technology University</affiliation>
    </contributor>
  </contributors>
  <dates>
    <date dateType="Issued">2018-10-25</date>
  </dates>
  <language>en</language>
  <resourceType resourceTypeGeneral="Text">Thesis</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://nadre.ethernet.edu.et/record/20234</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsVersionOf">10.20372/nadre/20233</relatedIdentifier>
    <relatedIdentifier relatedIdentifierType="URL" relationType="IsPartOf">https://nadre.ethernet.edu.et/communities/aastu</relatedIdentifier>
    <relatedIdentifier relatedIdentifierType="URL" relationType="IsPartOf">https://nadre.ethernet.edu.et/communities/nadre</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="http://www.opendefinition.org/licenses/cc-by">Creative Commons Attribution</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">&lt;p&gt;Concrete can be produced with a better quality by the addition of Water Reducing and Retarding&lt;br&gt;
(WRR) admixture in different ways by saving mixing water and cement content from a given mix&lt;br&gt;
design. This study investigated the effects of WRR admixture on ready mixed concrete properties&lt;br&gt;
viz: workability, compressive strength and permeability. To achieve the objective experiments&lt;br&gt;
were conducted on C-25 and C-40 concrete grades with 0.49 and 0.30 water to cement ratio&lt;br&gt;
respectively by a slump of 160-220mm, at a dosage of 0% (control), 0.5%, 0.85% and 1.2%&lt;br&gt;
admixture. To facilitate the study, the experiments have been done in four stages, namely: Stage I:&lt;br&gt;
to study the effects of WRR admixture on concrete workability, Stage II: to study the effects of&lt;br&gt;
WRR admixture at optimum dosage of workability on concrete compressive strength, Stage III: to&lt;br&gt;
study the effects of WRR admixture on compressive strength by reducing cement content in 5%,&lt;br&gt;
8% and 12% and Stage IV: to study the effects of WRR admixture on concrete compressive and&lt;br&gt;
permeability test by reducing amount of mixing water at constant slump. Based on the&lt;br&gt;
experimental results 0.85% and 1.2% WRR admixture dosage were found to have higher value of&lt;br&gt;
workability for C-25 and C-40 concrete grade respectively. At optimum dosage of 0.85% WRR&lt;br&gt;
admixture, the compressive strength of C-25 has shown improvement over that of the control mix&lt;br&gt;
whereas, the 1.2% WRR admixture slightly reduced the compressive strength of C-40 over the&lt;br&gt;
control mix. Further optimum results on concrete compressive strength was found at 8% cement&lt;br&gt;
reduced concrete with the addition of 0.85% and 1.2% WRR admixture for C-25 and C-40&lt;br&gt;
concrete grade respectively. Total CO2 emission and total cost was reduced from the control mix&lt;br&gt;
by optimum cement reduced and WRR admixture added concrete for C-25 and C-40. On the other&lt;br&gt;
hand, optimum result on C-25 compressive strength and permeability was found in the addition of&lt;br&gt;
1.2% WRR admixture by 11.32% mixing water reduction. It can therefore be concluded that the&lt;br&gt;
addition of WRR admixture was shown improvement on workability, compressive strength and&lt;br&gt;
permeability from the control mix. It is recommended that ready mixed concrete manufacturer&lt;br&gt;
should be used at 0.85% and 1.2% WRR admixture dose for C-25 and C-40 concrete respectively.&lt;/p&gt;</description>
  </descriptions>
</resource>
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