Impact of Plasticizers on The Quality of Concrete and The Reduction of The Cement Content



Preservation of our environment, the need to a balanced consumption of the natural resources, particularly fossil fuels, and the need to reduce greenhouse gas emissions will all make us decrease our cement consumption especially clinker. As a result, in producing the concrete and the mortar, we must take a lower consumption of cement in to our account as much as possible without hurting the volume of construction in the country.
In this article, we have shown that cement content is reduced with a constant w/c ratio and its impacts on the fresh and hardened concrete are studied. In continuation of the research, we reduced the w/c ratio (in 4 different ratios) and again the cement content was reduced in order to study the impacts of this reduction on lower ratios of w/c.
It is clear that by reducing the cement mix (‌reducing cement content and w/c ratio), the workability of the concrete will be highly reduced. To treat this problem, we can use plasticizers and superplasticizers which are explained thoroughly in the following sections. According to the obtained test results on fresh and hardened concrete, it can be concluded that reducing cement content (360kg to 450kg per m3) at the constant water / cement ratio will result in better strength and slump. On the other hand with reduction of w/c and adding super plasticizers for having better workability and flows more durability and higher strength could be gained.