The combined admixture of calcium lignosulphonate and sulphonated naphthalene formaldehyde condensates

摘要

A superplasticizer (high-range water reducer) and a plasticizer (ordinary water reducer) were mixed to form a new combined high-range water reducer. The combined admixture reported in this paper not only has a similar water reducing effect as the base high-range water reducer, but can also reduce the rate of loss of workability of the fresh concrete and achieve a saving in the material cost. The combined admixture was found to be particularly useful for hot weather concreting.