Chemical, Physical and Mechanical Properties of Hybrid Foam Concrete Panels Made of Polyurethane and white Portland Cement

Indoor heat blockage panels are important wall material for energy saving and room convenience, especially in tropical regions. The panels are prepared from hybrid foam concrete made of various percentages of polyurethane (PUR), and white Portland cement (WCM). The properties were studied based on the chemical reaction mechanism, physical parameters, and mechanical characteristics. Hybrid foam is fabricated in the form of wall panels by mixing diphenylmethane-۴,۴'-diisocyanate and blended polyol consisting of ethylene glycol, catalyst, surfactant, and Portland white cement filler with varying PUR matrix composition. XRF, XRD, FT-IR, and SEM analyses were conducted to identify the reaction mechanism, both cementation and polymerization reactions. Thermal conductivity and thermogravimetry analysis were conducted to determine the thermal properties of the panels. The XRF analysis on WCM specimens deduced the Ca(OH)۲ content of ۸۱.۳۶۶%, and XRD analysis of the hydration reaction recorded the presence of CSH at an angle of ۲θ = ۲۹o to ۲θ = ۳۵o, with insignificant crystallinity properties. In the percentage of ۲۵% and ۶۰% PUR, the porosities were ۱۱.۲۴% and ۱۷.۹۵%, respectively. It confirmed the density reduction from ۱,۲۵۱ kg/m۳ to ۱,۱۰۰ kg/m۳. The thermal conductivity decreased consistently as the percentage of PUR increased. The lowest thermal conductivity was recorded at ۰.۰۸۸۲ W/mK (PUR ۶۰%). At ۶۰% PUR, the compressive strength ranged from ۵ to ۸ MPa (۷–۲۸ days of curing time). Thermogravimetric behaviors of the PUR-WCM HFC showed that the two-stage decomposition peaks; at ۳۷۳ K and ۵۹۶ K, represented the dehydration of CSH and the decomposition of PUR. This material has the proper characteristics for a thermal insulation material since it has appropriate heat resistance, low thermal conductivity, and acceptable mechanical strength.

کلیدواژه ها:

Hybrid foam concrete ، Polyurethane matrix ، White Portland cement ، Mechanical properties ، physical parameter ، chemical reaction mechanism