Preparation and properties of phase-changing energy-storing concrete
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摘要: 膨胀珍珠岩吸附硬脂酸丁酯后用石灰石粉末改性制成相变储能骨料（PCESA），用其等体积部分取代砂制备相变储能混凝土。测试相变储能混凝土的抗压强度和劈裂抗拉强度，通过SEM图像分析相变储能混凝土的微观形貌，用DSC测试PCESA的相变特征及相变储能混凝土的比热容。试验结果表明：相变储能混凝土中PCESA结构保持完整且其与水泥石的界面过渡区密实，相对提高了相变储能混凝土的强度；PCESA具有较好的热物理性能，添加在混凝土中增强了混凝土的储能能力；当PCESA的掺量为20vol%时，相变储能混凝土具有较好的力学性能和热物理性能，在建筑结构中使用既可以起到承重的作用又能实现节能的目的。Abstract: Butyl stearate was impregnated into pores of expanded perlite, and limestone powder wrapped up it to prepare phase-changing energy-storing aggregates (PCESA). Phase-changing energy-storing concrete was prepared by PCESA replacing some sand. Experiments of compressive strength and splitting tensile strength were carried out for phase-changing energy-storing concrete. The micro-morphology of phase-changing energy-storing concrete was characterized by using SEM images. Both phase transition properties of PCESA and specific heat capacity of phase-changing energy-storing concrete were characterized by DSC technique. The test results show that:The PCESA remain intact in phase-changing energy-storing concrete, and interfacial transition zone (ITZ) is typical attribute of phase-changing energy-storing concrete with good integrity between cement paste and PCESA, which leads to the increase of phase-changing energy-storing concrete strength relatively. The increase of PCESA volume fraction results in a rising of specific heat capacity of phase-changing energy-storing concrete due to the good thermo-physical performance of PCESA. When the content of PCESA is up to 20vol%, the phase-changing energy-storing concrete has a good mechanical and thermo-physical performance, and it is equally amenable to bearing capacity and building energy conservation.
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