A Study on Polymer Modified High Volume GGBFS Concrete

Abstract This technical investigation represents a study on polymer modified high volume GGBFS concrete on providing durable and stable constructional material and increasing in utilisation of high volume of GGBFS in concrete and reduction of usage of portland cement and reduction of CO2 in the atmosphere. There was the many number of studies done on the polymer concrete, the polymer concrete is introduced in 1960’s based on the technical and practical situation in the construction industry. As considering the past history of polymer concrete and present situation of modern methods of strengthening, reparing and increasing in stability and life span civil engineering structure the technique of polymer concrete is introduced.

The high volume GGBFS concrete is one of the specific type of GGBFS concrete with lower water cementitious material ratio and at least 50% of Portland cement by mass is replaced by GGBFS. Due to lower water content, superplasticizer is essential in order to achieve the desired workability. GGBFS is used to improve workability of fresh concrete to reduce the heat of hydration, to increase durability and the strength of concrete, due to its pozzolanic activity.

In this study the GGBFS of 50% and 60% is used as the cement replacing material, SBR latex polymer, Super plasticizer of conplast-430 is used. This work is conducted to study the polymer modified high volume GGBFS concrete. Mix design is as per the high volume fly ash concrete technology best practice guidelines was used. The M30 grade concrete mix was prepared. The total number of specimens were casted 330. The 165 specimens as 50% and 165 specimens as 60% GGBFS replacement were casted. Polymer added to the concrete in the percentage of 0% to 5% in a 0.5% increment. The polymer added to the concrete with weight of the cementitious materials. The super plasticizer is added 1.2% throught the mix with weight of the cementitious materials. The higher workability is found at the 2.5% of polymer addition to the concrete. The strength of concrete is calculated at different percentages of polymers addition to the concrete. After the 28days of curing the test results shows the 2.5% of polymer and 50% of GGBFS replacement has the increase in strength as compared to 60% of GGBFS replacement for all strengths, i.e compressive strength, split tensile strength, flexural strength, shear strength, impact strength. Along with this the near surface characteristics such as water absorption and sorptivity are studied. By this study shows the percentages addition of polymer in concrete increases the strengths as compared to conventional concrete.

Keywords Polymer (SBR Latex), GGBFS, Conplast SP430, strength properties, workability, water absorption, soroptivity.

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Polymer Modified High Volume GGBFS Concrete

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