07-01-2022, 11:36 AM
Superplasticizers are clasified based on their chemical composition:
Sulphonated melamine - Formaldehyde condensates
Sulphonated napthalene - Formaldehyde condensates
Modified lignosulphonates
Carboxylated acrylic esters copolymers
Others like sulphuric-acid esters, amide polysaccharide mixtures, carbohydrate esters etc.
The Sulphonated melamine based plasticizers are generally preferable if ambient temperatures are low, while sulphonated napthalene based plasticizers are preferable in high ambient temperatures due to their good workability retention quality. Therefore they are more suitable for Indian conditions.
Lignosulphonates at times, also give air entrainment and set retardation in concrete. Polycarboxylate admixtures are high performance plasticizersJ_.., which also help in slump (workability) retention for a longer period.
Sulphonated melamine - Formaldehyde condensates
Sulphonated napthalene - Formaldehyde condensates
Modified lignosulphonates
Carboxylated acrylic esters copolymers
Others like sulphuric-acid esters, amide polysaccharide mixtures, carbohydrate esters etc.
The Sulphonated melamine based plasticizers are generally preferable if ambient temperatures are low, while sulphonated napthalene based plasticizers are preferable in high ambient temperatures due to their good workability retention quality. Therefore they are more suitable for Indian conditions.
Lignosulphonates at times, also give air entrainment and set retardation in concrete. Polycarboxylate admixtures are high performance plasticizersJ_.., which also help in slump (workability) retention for a longer period.