Study on strength and optical properties of photoluminescence cement-based composites materials.

Self-luminescent cement based functional materials were prepared by using long afterglow luminescent materials of rare earth and white Portland cement as main raw materials, which can absorb light during the day and luminous at night. The effects of different amount of luminescent powder and reflective powder on the luminescent and mechanical properties of self-luminescent cement-based cementing materials were studied by means of tests. The microscopic morphology, phase composition and mechanism were analyzed by means of SEM, XRD and PL spectra. The results showed that with the increase of the amount of luminescent powder and reflective powder, the initial luminance and the afterglow time of the specimen increased correspondingly, and compared to the control group, which increased by 4.7%-45.79%, 14.63%-59.09%, respectively. The luminous brightness for 8 h was kept at 0.02-0.2 cd/m². The addition of luminescent powder and reflective powder could improve the flexural strength and compressive strength of the cement-based material, while the strength of the specimen decreased gradually with the increase of the content of luminescent powder and reflective powder. The addition of luminescent powder and reflective powder could not only react with cement hydration product to produce a large number of hexagonal plates CH and cluster AFm crystal, but also promote the hydration reaction of the unhydrated cement particles. Moreover, owing to its smaller particle size, it could fill the tiny pores among hydration products, thereby improving microscopic distribution of the hardened cement matrix and enhancing strength to a certain extent. The hydration product of cement absorbed short wave ultraviolet light, thus reducing the excitation wavelength range and intensity of the specimen. The emission spectrum was yellowish green with a peak value of 520 nm. [ABSTRACT FROM AUTHOR]