两种耐水处理长余辉材料制备发光混凝土的性能对比研究

Comparative Study on Performance of Two Water Resistant Long Afterglow Materials for Preparing Luminescent Concrete

荧光粉的水解不稳定性会降低发光混凝土的力学强度和发光性能。本研究采用SiO_(2)包覆和疏水处理两种方法对长余辉荧光粉进行耐水处理并制备发光混凝土,对掺入不同耐水处理的荧光粉制备的发光混凝土进行抗压强度、发光性能和微观形态测试,揭示荧光粉对发光混凝土性能改善的作用机理。结果表明:与SiO_(2)包裹法处理相比,疏水处理荧光粉能够获得更优异的耐水性能;与SiO_(2)包裹法处理相比,疏水处理荧光粉发光混凝土28 d抗压强度提高了8.0%~25.7%,强度最高达80.2 MPa,最佳掺量为5%~10%(质量分数),过量添加则会产生不利影响;与未耐水处理荧光粉的发光混凝土相比,两种耐水处理荧光粉发光混凝土的微观结构密实度、抗压强度和发光性能均显著提高。

The hydrolytic instability of fluorescent powder can diminish luminescent concrete’s mechanical strength and luminescent performance.This study used two methods,SiO_(2)coating and hydrophobic treatment,to treat long afterglow fluorescent powder with water resistance and prepare luminescent concrete.The compressive strength,luminescent performance and microstructure of luminescent concrete prepared by adding fluorescent powder with different water resistance treatments were tested to reveal the mechanism of improving the performance of luminescent concrete by fluorescent powder.The results show that,compared to the SiO_(2)encapsulation method,the hydrophobic treatment of fluorescent powder achieves superior water resistance performance.And the 28 d compressive strength of hydrophobic treated fluorescent powder luminescent concrete has increased by 8.0%~25.7%,with a maximum strength of 80.2 MPa and an optimal dosage of 5%~10%(mass fraction).Excessive addition will have adverse effects.Compared with the luminescent concrete without water-resistant fluorescent powder,the microstructure density,compressive strength and luminescent performance of the two types of water-resistant fluorescent powder luminescent concrete are significantly improved.