Potential of Hollow Glass Microsphere as Cement Replacement for Lightweight Foam Concrete on Thermal Insulation Performance

Abstract

Abstract. Global warming can be defined as a gradual increase in the overall temperature of the earth's atmosphere. A lot of research work has been carried out to reduce that heat inside the residence such as the used of low density products which can reduce the self-weight, foundation size and construction costs. Foamed concrete it possesses high flow ability, low self-weight, minimal consumption of aggregate, controlled low strength and excellent thermal insulation properties. This study investigate the characteristics of lightweight foamed concrete where Portland cement (OPC) was replaced by hollow glass microsphere (HGMs) at 0%, 3%, 6%, 9% by weight. The density of wet concrete is 1000 kg/m3 were tested with a ratio of 0.55 for all water binder mixture. Lightweight foamed concrete hollow glass microsphere (HGMs) produced were cured by air curing and water curing in tank for 7, 14 and 28 days. A total of 52 concrete cubes of size 100mm x 100mm x 100mm and 215mm x102.5mm x 65mm were produced. Furthermore, Scanning Electron Microscope (SEM) and X-ray fluorescence (XRF) were carried out to study the chemical composition and physical properties of crystalline materials in hollow glass microspheres. The experiments involved in this study are compression strength, water absorption test, density and thermal insulation test. The results show that the compressive strength of foamed concrete has reached the highest in 3% of hollow glass microsphere with less water absorption and less of thermal insulation. As a conclusion, the quantity of hollow glass microsphere plays an important role in determining the strength and water absorption and also thermal insulation in foamed concrete and 3% hollow glass microspheres as a replacement for Portland cement (OPC) showed an optimum value in this study as it presents a significant effect than other percentage.

High strength/density ratio in a syntactic foam made from one-part mix geopolymer and cenospheres

“…However, the thickness of this region and its overlap with nearby green and light blue regions suggest that the silica-rich region is relatively well Figure 9 shows a comparison of the strengths and densities presented in Figure 8, to the results obtained from studies, which have achieved lightweight composites of similar densities using cementitious materials and lightweight aggregates. The lightweight composites were developed using cenospheres (Blanco et al [17] ; Hanif et al [41] and Wang et al [26]), cenospheres and aerogel (Hanif et al [23] and W G T and Ünal et al [42]], foam and aerated concretes (Awang et al [43], Sanjayan et al [44], and Hussin et al [45]), foam and aggregate (Jones et al [46]), Sidorajo mud (Ekaputri et al [47]), glass microspheres (Shahidan et al [48] and Shao et al [28] ), expanded perlite (Sengual et al [49]) and porous siliceous materials (Pimraksa et al [50]).…”

Evaluación de las propiedades mecánicas de concretos modificados con microesferas de vidrio y residuos de llantas

“…Adicionalmente, se ha reportado en trabajos previos que las partículas de polímeros generan una elevada porosidad en concretos modificados, a causa del aire atrapado por las partículas de caucho, de manera que aumenta el porcentaje de vacíos de aire, por ende, disminuye la densidad de los especímenes de concreto [24]. Los resultados encontrados indican que la disminución en la densidad es menor al 10%, lo cual está acorde con los resultados previamente reportados, [10], [12], [25], [26], donde la incorporación de microesferas de vidrio con densidades entre 150 Kg/m 3 hasta 900 Kg/m 3 , generó disminuciones en la densidad de los materiales preparados alrededor del 20%, sin embargo, las microesferas utilizadas por los autores presentaron densidades muy inferiores a las reportadas en este trabajo.…”

“…Las microesferas de vidrio también han sido evaluadas favorablemente como material de reemplazo de compuestos cementantes y de los agregados, de manera que modifican la resistencia a la compresión, la densidad y el módulo de elasticidad de los concretos preparados. Shahidan et al [10], evaluaron el efecto de reemplazar el 3%, 6% y 9% del cemento por microesferas de vidrio en la elaboración de concreto celular ligero, se halló que el 3% es el porcentaje más adecuado de microesferas para generar concretos con aplicaciones estructurales; de hecho, este contenido de microesferas genera un aumento del 22 % de la resistencia a la compresión. Así mismo, Brooks et al [11], realizaron un estudio comparativo de las propiedades mecánicas de concretos ligeros al realizar una sustitución del 7%, 14%, 21% y 28% de volumen de los agregados finos por microesferas de diferentes tamaños.…”

Glassy Microspheres for Energy Applications

“…The foam with 5% VMS–HGM yielded a minimum thermal conductivity of 0.078 W/mK [ 75 ]. In the construction sector, HGM may also be used to partially replace Portland cement in a lightweight foamed concrete: depending on the percentage of HGM, one can obtain a higher compressive strength or a lower thermal conductivity, e.g., going from 0.2507 W/mK of the full cement to 0.2029 W/mK of the foam with 6% soda-lime glass HGM [ 76 ].…”