Thesis Open Access

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

Yordanose Mogse


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    <subfield code="a">&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;</subfield>
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    <subfield code="a">Concrete, WRR, Admixture, Compressive Strength, Workability and Permeability</subfield>
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    <subfield code="a">Water Reducing and Retarding Admixture Effect on the Mechanical Properties of Ready Mixed Concrete</subfield>
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    <subfield code="a">Yordanose Mogse</subfield>
    <subfield code="u">Addis Ababa Science &amp; Technology University</subfield>
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    <subfield code="a">Habtamu Hailu  ( PhD )</subfield>
    <subfield code="u">Addis Ababa Science &amp; Technology University</subfield>
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