STRAW PULP WASTE LIQUOR AS A WATER-REDUCING ADMIXTURE

This paper discusses the production and properties of a new water-redu cing admixture produced from alkaline treated straw pulp waste liquor. The development of the new material could help to eliminate the envir onmentally polluting black waste liquor of paper pulp, and also provid es a low-cost by-product that can be widely used in the construction i ndustry. It could have important social and economic benefits. The new water-reducing admixture is produced by evaporation and sulphonation of the alkaline treated black straw pulp waste liquor. It gives a wate r reduction of over 8%, and the compressive strength of concrete could be increased by over 10%. The admixture complies with the relevant Ch inese National Standard. Trial tests show that this type of water-redu cing admixture can be further modified to become a high-range water re ducer by use of a modifying agent.