漂珠改性保温隔声砂浆的制备及性能研究  

Preparation and performance study offloating bead modified thermal insulation and sound insulation mortar

作　　者：吴兵 WU Bing(Infrastructure Department,Fujian Normal University,Fuzhou 350000,China)

机构地区：[1]福建师范大学基建处,福州350000

出　　处：《功能材料》2024年第11期11147-11152,11181,共7页Journal of Functional Materials

基　　金：福建省自然科学基金项目(2023J05190)。

摘　　要：以普通硅酸盐水泥、聚苯乙烯颗粒和聚丙烯纤维为原料,以漂珠取代砂浆中的水泥制备了保温隔声砂浆,研究了不同漂珠取代率对砂浆力学性能、微观形貌、保温性能和隔声性能的影响。结果表明,漂珠取代率的增加改善了混凝土的级配,减轻了破坏形态表面的脱落。随着漂珠取代率的逐渐增大,保温隔声砂浆的密度、抗压强度、抗折强度、压剪粘结强度和线收缩率均降低,而稠度增大。漂珠取代率20%的砂浆的密度最低为421 kg/m^(3),抗压强度和抗折强度最低为2.79和0.67 MPa,压剪粘结强度和线收缩率最低为0.41 MPa和0.216%。漂珠取代率的增大在保温隔声砂浆中形成了更多的空心结构,提高了砂浆的保温性能和隔声性能,漂珠取代率20%的砂浆的导热系数为最低值0.042 W/(m·K),保温性能最优。砂浆在8~16 kHz频段的撞击声压级较低,隔声能力较强,漂珠取代率20%的砂浆在16 kHz的撞击声压级为最低值31 HB。A thermal insulation and sound insulation mortar was prepared using ordinary Portland cement,polystyrene particles,and polypropylene fibers as raw materials,and with floating beads replacing cement in the mortar.The influence of different replacement rates of floating beads on the mechanical properties,microstructure,insulation performance,and sound insulation performance of mortar was studied.The results indicated that the increase in the replacement rate of floating beads improved the gradation of concrete and reduced the detachment of the damaged surface morphology.As the replacement rate of floating beads gradually increased,the density,compressive strength,flexural strength,shear bond strength,and linear shrinkage rate of insulation and sound insulation mortar decreased,while the consistency increased.The lowest density of mortar with a 20%replacement rate of floating beads was 421 kg/m^(3),and the lowest compressive strength and flexural strength were 2.79 and 0.67 MPa,respectively.The lowest compressive shear bond strength and linear shrinkage rate were 0.41 MPa and 0.216%,respectively.The increase in the replacement rate of floating beads forms more hollow structures in the insulation and sound insulation mortar,improving the insulation and sound insulation performance of the mortar.The thermal conductivity of the mortar with a floating bead replacement rate of 20%was the lowest value of 0.042 W/(m·K),indicating the best insulation performance.The impact sound pressure level of mortar in the frequency range of 8-16 kHz was relatively low,and its sound insulation ability was strong.The mortar with a floating bead replacement rate of 20%had the lowest impact sound pressure level of 31 HB at 16 kHz.

关 键 词：漂珠 水泥砂浆 力学性能 保温性能 隔声性能 

分 类 号：TQ177.6[化学工程—硅酸盐工业]