Title: Enhancing Workability Retention of Concrete Containing Natural Zeolite by Superplasticizers’ Combination

Author(s): Hessam AzariJafari, Mohammad Shekarchi, Javad Berenjian, and Babak Ahmadi

Publication: Symposium Paper

Volume: 302

Issue:

Appears on pages(s): 416-424

Keywords: natural zeolite; superplasticizers’ combination; superplasticizer’s demand; workability loss

DOI: 10.14359/51688113

Date: 6/1/2015

Abstract:
Use of pozzolanic materials such as natural zeolite as portland cement replacement helps to reduce amount of CO2 emission due to clinker production. Natural zeolite also improves mechanical and durability properties of concrete. It is common to use natural zeolite as a rheological modifying admixture in flowing concrete. However, many cases were reported that zeolite blended cements showed severe workability loss. The object of the analysis is to investigate compatibility of different chemical-based superplasticizers and effect of superplasticizers’ combination on workability retention of concrete made with zeolite blended cement. The results show that combination of lignosulfonate admixture with naphthalene and polycarboxylate based admixture not only reduces the superplasticizer’s demand to achieve certain workability retention, but also helps to reduce slump loss.