EFFECT OF SUPERPLASTICIZERS COMPATIBILITY ON THE WORKABILITY, EARLY AGE STRENGTH AND STIFFENING CHARACTERISTICS OF OPC, PPC, AND PSC PASTES AND MORTAR

S.M.Maheshwarappa, Madhuvan S, Chetan Kumar K.M, J.K.Dattatreya

Abstract: Super Plasticizers have become indispensable constituents of any designed concrete mix today. Property of fresh and hardened concrete is strongly influenced by the interaction of Superplasticizers and cement. A careful selection of SP is essential. In this paper, an attempt has been made to understand the effect of 2 types Superplasticizers i.e. PCE/Polycarboxylic ethers based and SNF/sulphonated naphthalene based formaldehyde with 3 types of cements OPC, PPC and PSC cement by investigating effect of SP on the properties of cement pastes and mortars. The fresh properties of paste and mortar such as saturation dosages, slump retention, flow retention, setting time, early age strength, effect of SP, and effect of sand have been investigated using Mini-Slump cone, Marsh cone, Flow table and V-Funnel apparatus. The strength properties of mortars are also determined for different proportions of cement and sand for various w/c ratios. From the studies, it can be observed that among PCE and SNF based SP’s PCE exhibits better compatibility with all types of cements in terms of workability and also strength and SP dosage required for mortar was found to be 0.8-1% more than dosage required for cement paste due to incorporation of sand.

Keywords: Superplasticizers; Cements; Compatibility; Saturation dosage

DOI: https://doi.org/10.15623/ijret.2014.0315083