Effects of Cationic Surfactant on Fresh and Hardened Properties of Cement-Based Mortar

Abstract

The objective of this study is to analyze the effects of using surfactant (CTAB) and cellulose nanofibers (NFC) as an admixture in cement mortars. We examined composite properties as porosity, compression energy, thermal conductivity and hydration. The results showed that with the addition of 0.7% by weight of NFC per emulsion in the presence of a cationic surfactant (CTAB). The new material produced presented a dry porosity between 4.7% and 4.4%, compressive strength between 9.8 and 22.9 MPa, and thermal conductivity between 0.95 and 2.25 W•m −1 •K −1 . Thus we show better mechanical and thermal performance than that traditional Portland cement mortar with a density similar. In addition, the mortar made by emulsion of ordinary portland cement, cellulose nanofiber and organophilic clay (OC) treated with cetyltrimethylammonium bromide (CTAB) obtained has good resistance under high temperature and water, as well as excellent thermal insulation performance under high temperature and humidity conditions. This study verified that the presence of NFC promotes hydration, leading to the production of more calcium silicate and portlandite gel.

Bio-PCM Panels Composed of Renewable Materials Interact with Solar Heating Systems for Building Thermal Insulation

“…We made a comparison of our results with those found in the literature relating to thermal characteristics of PCM similar to our work [15,22]. This decrease can be the consequence of introducing insufficient WFT to encourage the creation of a standardized framework.…”

“…Figure 1: Particle size distribution of silica sand [22], Copyright © 2019, Tech Science Press cleaned clay with 1000 ml of H 2 SO 4 sulfuric acid solution (1 M) with mechanical stirring at 80°C. Once the clay was completely dispersed, a simple filtration was carried out followed by washing with distilled water before being dried in the oven for 24 h, then ground again in a mortar.…”

“…These particles' organic components include celluloses, hemicelluloses, lignins, and fatty acids [20,21]. These substances are well known for giving renewable bio-materials a high degree of rigidity and flexibility [22]. Due to high polysaccharide, phenolic, and fatty acid content as well as the production of several crucial substances, such as coconut oil, coconut has also been used [23].…”

“…To create PCM bio-composites from the renewable materials, coconut oils can be combined with other biomasses like wood fibers or organophilic clays by adsorption or impregnation between the clays' leaves, which are exfoliated by cationic surfactants of the CTAB type [22,24]. Coconut oils demonstrated a high rate of impregnation of bio-PCMs made of wood fibers, which gives the substance a high latent heat capacity [25].…”