Relation between Young's Modulus of set plaster and complete wetting of grain boundaries by water

被引：19

作者：

Badens, E ^{[1
]}

Veesler, S ^{[1
]}

Boistelle, R ^{[1
]}

Chatain, D ^{[1
]}

机构：

[1] CNRS, CRMC2, F-13288 Marseille 9, France

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 1999年 / 156卷 / 1-3期

关键词：

complete wetting; set plaster; gypsum; water adsorption; grain boundary; Young's modulus;

D O I：

10.1016/S0927-7757(99)00097-7

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The mechanical behavior of set plaster has been studied in humid atmospheres. This material is made of entangled needle-shaped gypsum crystals. At room temperature, Young's modulus of set plaster decreases as the coexistence of gypsum and water is approached by increasing the humidity of the surrounding air. Simultaneously, the thickness of the adsorbed water layer at the grain boundaries between the gypsum crystals is shown to diverge. It is suggested that the gypsum crystals are able to slide along certain grain boundaries because the viscosity of the water film approaches that of bulk liquid water. Small additions of D,L-tartaric acid prevent both the adsorption of water at grain boundaries of gypsum and the decrease of the Young's modulus of set plaster. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：373 / 379

页数：7

共 15 条

[1] IMPROVEMENT OF THE MECHANICAL-PROPERTIES OF SET PLASTERS BY MEANS OF 4 ORGANIC ADDITIVES INDUCING (101) FACES [J].