Thermal energy storage is an attractive option for effectiveness since it gives flexibility and reduces energy consumption and costs. New composite materials for storage and transformation of heat of NaCl-Al2O3composi...Thermal energy storage is an attractive option for effectiveness since it gives flexibility and reduces energy consumption and costs. New composite materials for storage and transformation of heat of NaCl-Al2O3composite materials were synthesized by one-step synthesis method. The chemical composition, morphology, structure, and thermal properties were investigated by XRD, EDS, SEM, and DSC. The results show that NaCl can be absorbed by Al2O3particle from 800 to 900 ℃ for Al2O3particle surface is rich active structure. The results also indicate that the leakage of NaCl when the phase change can be prevented by Al2O3particles and the enthalpy of phase change of NaCl-Al2O3material is 362 J/g. The composites have an excellent heat storage capacity. Therefore, this study contributes to one new thought and method to prepare high temperature heat storage material and this material can be applied in future thermal engineering.展开更多
通常采用大量掺加辅助性胶凝材料的方式提高胶凝材料的抗Cl^(–)渗透性能,进而提升混凝土结构的耐久性和服役寿命,但会显著降低早期力学性能.为提高早期强度和抗Cl^(–)渗透性能,基于初始浆体密堆积与水化过程孔隙有效填充,设计细、中...通常采用大量掺加辅助性胶凝材料的方式提高胶凝材料的抗Cl^(–)渗透性能,进而提升混凝土结构的耐久性和服役寿命,但会显著降低早期力学性能.为提高早期强度和抗Cl^(–)渗透性能,基于初始浆体密堆积与水化过程孔隙有效填充,设计细、中、粗粒度区间胶凝材料的种类和掺量,提高浆体的初始堆积密度和水化产物固氯能力,从而细化孔径并增大孔隙曲折度,采用59%的水泥熟料(粒径范围4~55μm),成功制备了3 d抗压强度27.3 MPa、28 d Cl^(–)扩散系数低至0.36×10^(–12)m^(2)/s的高抗渗透复合胶凝材料,为水泥基材料微结构调控和抗渗性能提升奠定基础.展开更多
基金Funded by the National Natural Science of China(No.2012BAA05B06)
文摘Thermal energy storage is an attractive option for effectiveness since it gives flexibility and reduces energy consumption and costs. New composite materials for storage and transformation of heat of NaCl-Al2O3composite materials were synthesized by one-step synthesis method. The chemical composition, morphology, structure, and thermal properties were investigated by XRD, EDS, SEM, and DSC. The results show that NaCl can be absorbed by Al2O3particle from 800 to 900 ℃ for Al2O3particle surface is rich active structure. The results also indicate that the leakage of NaCl when the phase change can be prevented by Al2O3particles and the enthalpy of phase change of NaCl-Al2O3material is 362 J/g. The composites have an excellent heat storage capacity. Therefore, this study contributes to one new thought and method to prepare high temperature heat storage material and this material can be applied in future thermal engineering.
文摘通常采用大量掺加辅助性胶凝材料的方式提高胶凝材料的抗Cl^(–)渗透性能,进而提升混凝土结构的耐久性和服役寿命,但会显著降低早期力学性能.为提高早期强度和抗Cl^(–)渗透性能,基于初始浆体密堆积与水化过程孔隙有效填充,设计细、中、粗粒度区间胶凝材料的种类和掺量,提高浆体的初始堆积密度和水化产物固氯能力,从而细化孔径并增大孔隙曲折度,采用59%的水泥熟料(粒径范围4~55μm),成功制备了3 d抗压强度27.3 MPa、28 d Cl^(–)扩散系数低至0.36×10^(–12)m^(2)/s的高抗渗透复合胶凝材料,为水泥基材料微结构调控和抗渗性能提升奠定基础.
