Study of Transfer Properties on Fresh Cement Pastes; Laboratory Experiments: Discontinue Measurements using a Permeameter

Jean Claude Tchamba,Théodore Gautier L J Bikoko

doi:10.5539/jmsr.v5n2p23

Abstract

<p class="1Body">The study of hydraulic conductivity or permeability (k) of fresh cement pastes is a fundamental stage to understand the concrete<strong> </strong>placement in their formworks, and for the more extended study of the rheology of cementitious materials at fresh state. The results here are obtained on fresh cement pastes (PC) PC30, PC36 and PC40 with water- to- cement ratio (w/c) of 0.30, 0.36 and 0.40 respectively with a classical permeameter traditionally used in geotechnical for soil permeability measurements: the constant head permeameter. It has the advantage of allowing accurate measurements and staggered over time. The analysis of results obtained are in agreement with those obtained elsewhere in the literature.</p>

Highlights

Cement is a basic construction material, and the hydraulic cement known is Portland cement
The apparatus consists mainly of a cell of 795 cm3 (10.2 cm of diameter and 10 cm of height) in which we introduced the fresh cement paste and a balance of accuracy of 0.01 g was used to weigh water squeezing out of the sample (Amziane, 2005)
When the test procedures are shifted in time, the volume of water percolating decreases with time of hydration of fresh cement paste

Summary

Introduction

Cement is a basic construction material, and the hydraulic cement known is Portland cement. Such measurement can be used for stability analyses of earth and retaining structures (Assaad & Harb, 2013), to quantify the liquid filtration rate under a given pressure gradient, to evaluate the interstitial fluid transport properties as it links the liquid flow rate to the pressure gradient (Pierre, Perrot, Picandet, & Guevel, 2015), to predict the amount of bleed water using consolidation theory (Rangeard, Perrot, Picandet, Mélinge, & Estellé, 2015 ; Assaad & Harb, 2011; Josserand, Coussy, & de Larrard, 2006 ; Josserand & de Larrard, 2004 ; Yim, Kim, Kwak, & Kim, 2013), to give drainage criteria for various concrete casting and pre-casting procedure (Pierre et al, 2015 ; Perrot, Lanos, Estellé, & Mélinge, 2006), to predict the drying kinetic after casting (Bentz, Hansen, Madsen, Vallée, & Griesel, 2001) and to estimate the quantity of under- ground seepage under various hydraulic conditions (Assaad & Harb, 2013)

Methods

Results

Conclusion