Preparation of Porous Mordenite/Calcium Silicate Hydrate Composites for Indoor Environment Control

Abstract

A micro/mesoporous composite was prepared by a hydrothermal reaction using mordenite and slaked lime to create a comfortable and safe indoor environment. After the hydrothermal reaction, calcium silicate hydrates formed due to the reaction of slaked lime, mordenite, and quartz, led to the generation of mesopores with a broad pore size distribution of more than 3 nm.In this experiment, the microporous structure of mordenite partially collapsed due to dissolution. As compared with mordenite, the composites exhibited higher water‐vapor adsorption/desorption properties using their mesopores. The amount of adsorbed harmful gases at 70% relative humidity was larger for the composites than for mordenite.

The Use of Sorption Balance for the Characterization of the Water Retention Curve of Cement-Based Materials

“…Sorption balances have existed for a very long time (McBain and Bakr 1926;Gregg and Wintle 1946;Gregg 1955;Gleeson 1962;Tamburini 1970) however now, there are reliable models available from numerous suppliers (Keller and Robens 2003). They are especially and commonly used in various scientific fields: pharmaceuticals, the food industry or the study of materials (Cazacu et al 2009;Lyn et al 2010;Ayadi and Dole 2011;Maeda et al 2011;Wicklein et al 2011;Argyropoulos et al 2012;Carter and Schmidt 2012;Pei and Zhang 2012;Volkova et al 2012;Zhang et al 2012;Besbes et al 2013;Jung et al 2014;Pons et al 2015;Mette et al 2014;Guicheret-Retel et al 2015;Otoni et al 2016). In these areas it has been proven that the use of sorption balance is able to obtain similar results to other common techniques (Johannesson and Janz 2002;Arlabosse et al 2003;Fei et al 2006).…”

Smart concretes and structures: A review

“…The humidity self-controlling property of concrete is ascribed to incorporate mesopores with appropriate diameters and a broad pore size distribution into concrete. The zeolite with adequate mesopores is the potential candidate (Goto and Terao, 2005;Maddison et al, 2009;Maeda et al, 2011;Rao et al, 2012;Vu et al, 2013;Zhang and Yoshino, 2010). The schematic diagram of humidity self-controlling concrete is shown in Figure 39.…”