Talk:Plasticizer

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202.83.174.105 04:33, 7 April 2007 (UTC)HASSAAN JAVED 202.83.174.105 04:33, 7 April 2007 (UTC) Whenever we need to study any physical nature of a functioning of materials we have to make all related parameters constant except the parameter which is underconsideration.plastizers are those admixture(admixtures are those which are added in a dry form before mixing of materials for use)which decrease the consistancy of concrete mix(tendency to flow)and improves the workability by considereing water cement ratio constant. the main function of plasticizers is as follow: when cement in aqueous state dissociates into sulphate ions and hydroxide ions the case relating to this is hydroxide ions will repel each other because of -charge but charge intensity is less to move the solid paricles but when we add plasticizers it gives high charged negative ions into the mixing system and the alkaline mix(because of hydroxide) negative ions will repel each other and capable to slide other particles over other one and thus we may get that results as loss of consistancy increase slump value decrease water requirment increase chances of segregation increase in strenght upto a certain limit

  We may use this material by weight/weight relation

upto 12% to 30% can be satisfactorally use according to the ASTM standards

    we use C-494 ASTM standard for this

Hassaan Javed student of civil engineering University Of Engineering & Technology Lahore, PAKISTAN hassaanuetian02@gmail.com or hjm02@hotmail.com