A new insulating coating with characteristics of sand texture and imitation ceramic

Wan, Yiling; Chen, Ru; Shumin, Huang; Xu, Yuhong; Zhong, Difang

doi:10.1016/j.conbuildmat.2014.01.092

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…Here, formation of the ceramic coating on the concrete wall is the key to get some understanding of such various functions. Wan et al [17] showed that the coating with characteristics of sand texture and imitation ceramic had good adhesive, corrosion, acid and alkali resistance, increased degradation temperature up tp 410 • C, and low thermal conductivity of 0.055 W/(m•K). How can the ceramic coating be formed without calcination or pressing?…”

Section: Introductionmentioning

confidence: 99%

Formation and characterization of ceramic coating from alumino silicate mineral powders in the matrix of cement composite on the concrete wall

Yu¹,

Ri²,

Kim³

et al. 2018

Preprint

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Enhancement of thermal performance of concrete wall is nowadays of great importance in reducing the operational energy demand of buildings. We developed a new kind of inorganic coating material based on SiO 2 -Al 2 O 3 -rich minerals and Portland cement (PC) powder. The finely pulverized mineral powder with the particle size distribution (PSD) of 0.4-40 µm was mixed with the vehicle solvent containing some agents, cement powder with PSD of 2-100 µm, and water in the certain weight ratio, producing the colloid solution. After application within 2 hours to the plaster layer of concrete wall and sufficient long hardening period of over three months, the coating layer of 0.6-1.0 mm thickness was observed to become a densified ceramic. Powder X-ray diffraction (XRD) experiments were performed to identify the crystalline components of minerals, cement and ceramic coating powders. Three-and two-dimensional surface morphologies and chemical compositions of coating material were obtained with the optical interferometer and scanning electron microscope (SEM) equipped with an energy dispersive X-ray analyzer (EDX). These XRD and SEM/EDX analyses demonstrated obviously that the coating layer is mainly composed of the calcium-silicate-hydrate (C-S-H) and the calcium-aluminate-hydrate (C-A-H) ceramics with the relatively small number of closed pores (10% porosity) compared with the cement mortar and concrete layers. Two-step hydrations of cement and subsequently SiO 2 -Al 2 O 3 promoted by the alkali product Ca(OH) 2 were proposed as the main mechanism of ceramic formation.

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Section: Introductionmentioning

confidence: 99%