QUANTITATIVE EVALUATION STRUCTURE OF CEMENT PASTE

Author(s): Hamlin M. Jennings
Book Title: RILEM International Symposium on Concrete Modelling - CONMOD 2014
Editor: Kefei Li, Peiyu Yan and Rongwei Yang
ISBN: 978-2-35158-139-1
e-ISBN: 978-2-35158-140-7
Publisher: RILEM Publications SARL
Publication year: 2015
Pages: 4
Total Pages: 1
Language: English

Abstract: Abstract only
Cement paste has a complex distribution of water-filled pores and molecular-scale waterfilled spaces. Building on a new understanding of the water sorption isotherms the complex pore structure of cement paste is quantitatively characterized. Both reversible and irreversible changes to the microstructure, under drying, but also caused by load and chemical deterioration, dictate the service life of concrete. This talk explores these changes caused by drying, in the hope that these techniques can help finally pin down the associated mechanisms of creep and shrinkage. The microstructure is divided into 1) solid, and 2) pore space. The historically contentious problem that interlayer space as part of the “solid,” is overcome by noting that water in this space does not leave until the relative humidity is < about 20%. This is the first step in modeling the entire water space by dividing it into two parts, the interlayer space, and the gel and capillary pore. With this new model the interpretation of irreversible and reversible shrinkage becomes tractable, and the water isotherm reveals many changes in great detail.

Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00