Volume :

2

Issue :

1

Abstract :

Sustainable development is the challenge of meeting human needs for natural resources, industrial products, energy, food, transportation, shelter and effective waste management while conserving and protecting environmental quality and the natural resource base essential for future development. It is well known fact that in the manufacturing 1 metric ton of cement produces 0.9 metric ton of CO2. To overcome this problem the use of cement in concrete and cement mortars should be decreased. This can be done by replacing the cement into other available cementetious materials or by using different admixtures. However most of the modern concretes almost always possess additives, either in the mineral form or chemical form. Particularly, chemical admixtures such as water reducers and set controllers are invariably used to enhance the properties of fresh and hardened concrete. In this review paper the superplasticizer which is an admixture to concrete is being used. Their addition to concrete or mortar allows the reduction of the water to cement ratio, not affecting the workability of the mixture, and enables the production of self-consolidating concrete and high performance concrete. This effect drastically improves the performance of the hardening fresh paste. Indeed the strength of concrete increase whenever the amount of water used for the mix decreases. However, their working mechanisms lack of a full understanding, revealing in certain cases cement-superplasticizer incompatibilities. These polymers are used as dispersants to avoid particle aggregation, and to improve the rheology of suspensions such as in concrete applications. Superplasticized concrete pumps easily and arrives workable. For maximum effectiveness, however, superplasticizers must be added to the mix at the right time.