Saca Nastasia, Radu Lidia, Stoleriu Stefania, Dobre Daniela, Calotă Răzvan, Truşcă Roxana
Faculty of Roads, Railways and Bridges, Technical University of Civil Engineering, 020396 Bucharest, Romania.
Faculty of Chemical Engineering and Biotechnologies, National University of Science and Technology Politehnica of Bucharest, 011061 Bucharest, Romania.
Materials (Basel). 2024 Jul 10;17(14):3412. doi: 10.3390/ma17143412.
This study aimed to obtain and characterize a mortar with perlite aggregate and thermal-treated materials that could substitute for Portland cement. First, the thermally treated materials were obtained by calcinating old Portland cement (OC-tt) and concrete demolition waste (CC-tt) at 550 °C, for 3 h. Second, plastic mortars with a perlite: cement volume ratio of 3:1 were prepared and tested for water absorption, mechanical strength, and thermal conductivity. The microstructure was also analyzed. Portland cement (R) was partially substituted with 10%, 30%, and 50% OC-tt. Thermal-treated materials negatively influenced the compressive and flexural strengths at 7 and 28 days. With an increase in the substitution percentage to 50%, the decrease in the compressive strength was 40% for OC-tt and 62.5% for CC-tt. The presence of 10% OC-tt/CC-tt positively influenced the water absorption. The thermal conductivity of the tested mortars was in the range of 0.37-0.48 W/m·K. SEM analysis shows the expanded perlite pores remained unbroken.
本研究旨在获得并表征一种以珍珠岩骨料和经过热处理的材料替代波特兰水泥的灰浆。首先，通过在550℃下煅烧旧波特兰水泥（OC-tt）和混凝土拆除废弃物（CC-tt）3小时来获得经过热处理的材料。其次，制备珍珠岩与水泥体积比为3:1的塑性灰浆，并对其吸水性、机械强度和热导率进行测试。还对微观结构进行了分析。用10%、30%和50%的OC-tt部分替代波特兰水泥（R）。经过热处理的材料对7天和28天的抗压强度和抗折强度有负面影响。当替代百分比增加到50%时，OC-tt的抗压强度下降40%，CC-tt的抗压强度下降62.5%。10%的OC-tt/CC-tt的存在对吸水性有积极影响。测试灰浆的热导率在0.37 - 0.48W/m·K范围内。扫描电子显微镜分析表明膨胀珍珠岩孔隙保持完整。
