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Title: Thixotropic and Chemical Structural Build-up of Cement Pastes with Superplasticizer under Different Storage Conditions

Author(s): Kun Zhang, Alexander Mezhov, Wolfram Schmidt

Publication: Symposium Paper

Volume: 354


Appears on pages(s): 13-24

Keywords: thixotropy, superplasticizer, structural build-up, texture analyzer, penetration test

DOI: 10.14359/51736058

Date: 7/1/2022

The paper presents the results of a study on the influence of agitation on the structural build-up of fresh cement pastes using a penetration test. It first presents results about the influence of the penetrating shape’s geometry on the influence of the cement paste specimen. Then, results are shown for the load-deflection curves depending upon time and agitation before testing. Based on the observation of the force required to penetrate the sample, conclusions on the structural build-up can be made. The observations were made over the course of time with samples that were left at rest and partly agitated before testing at different time steps. The setup allows identifying the contribution of the chemical reaction to the structural build-up process. The presence of superplasticizer obviously reduces the load that cement paste can withstand, while the loss of thixotropy is found notably lower than that of neat cement pates.