You are asked to evaluate the performance of two superplasticizers on the equal solidcontent basis. The first superplasticizer is melamine (M) based and having the specificgravity of 1.10 and a total solids content of 22%. The second superplasticizer isnapththalene (N) based and having the specific gravity of 1.21 and a total solidscontent of 42%. If the required amount melamine superplasticizer is 8 liters per cubicmeter, then(a) Determine the volume of the napththalene superplasticizer, if equal solids contenthas to be maintained. [Ans: 3.8 L](b) Determine the mixing water content required, when the cement content of the trialmixes is 400 kg/m3 and the free water to cement ratio of 0.50. Assume that theaggregates are in saturated surface dry conditions. [Ans: M = 193.14 kg; N = 197.33kg](c) What is the dosage of superplasticizers in the trial mixes? [Ans: M = 8 L/m3; N =3.8 L/m3]
You are asked to evaluate the performance of two superplasticizers on the equal solid
content basis. The first superplasticizer is melamine (M) based and having the specific
gravity of 1.10 and a total solids content of 22%. The second superplasticizer is
napththalene (N) based and having the specific gravity of 1.21 and a total solids
content of 42%. If the required amount melamine superplasticizer is 8 liters per cubic
meter, then
(a) Determine the volume of the napththalene superplasticizer, if equal solids content
has to be maintained. [Ans: 3.8 L]
(b) Determine the mixing water content required, when the cement content of the trial
mixes is 400 kg/m3 and the free water to cement ratio of 0.50. Assume that the
aggregates are in saturated surface dry conditions. [Ans: M = 193.14 kg; N = 197.33
kg]
(c) What is the dosage of superplasticizers in the trial mixes? [Ans: M = 8 L/m3; N =
3.8 L/m3]
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