光致发光水泥基复合材料的强度与光学特性研究
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摘要
以稀土类长余辉发光材料与白色硅酸盐水泥为主要原料,制备出白天吸光夜间发光的自发光水泥基功能材料。通过试验研究了不同掺量的发光粉与反光粉对自发光水泥基胶凝材料发光性能与力学性能的影响,并采用SEM、XRD和PL谱等表征手段分析其微观形貌特征、物相组成及作用机理等。结果表明,随着发光粉与反光粉掺量的增加,发光试件的初始亮度、10 min亮度与余辉时间均相应增大,与对照组相比,分别可提高4.74%～45.79%,14.63%～59.09%,8 h时发光亮度保持在0.02～0.2 cd/m~2。发光粉与反光粉的掺入可提高水泥基材料的抗折强度与抗压强度,而随着其掺量的增加,试件强度逐渐降低。发光粉与反光粉的掺入不仅能与水泥水化产物发生反应生成大量的六方板状CH与簇状AFm晶体,还能促进未水化颗粒发生水化反应,同时由于其粒径较小,可填充水化产物间的微小孔隙,在一定程度改善其微观分布,提高其强度。水泥水化产物会吸收短波紫外光,从而降低发光试件激发波长范围及激发强度,发射光谱为峰值520 nm的黄绿色。
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/m~2. 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.
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/m~2. 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.
引文
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[2] Zhang Rui,Cheng Xin,Hou Pengkun,et al.Influences of nano-TiO2 on the properties of cement-based materials:hydration and drying shrinkage [J].Construction and Building Materials,2015,81:35-41.
[3] Nazari A,Riahi S,Riah S,et al.Influence of Al2O3 nanoparticles on the compressive strength and workability of blended concrete [J].Journal of American Science,2010,6(5):6-9.
[4] Lin Wenyan,Chen Junzhen.Analysis of influencing factors on road performance of energy storage type self-luminescent traffic safety signs[J].Highway Traffic Technology,2016(3):353-354(in Chinese).林文岩,陈君珍.蓄能型自发光交通安全标识路用性能影响因素分析[J].公路交通科技,2016 (3):353-354.
[5] Li Songkun,Wang Xiaoping,Wang Lijun,et al.Research progress on long persistence luminescent materials [J].Materials Review,2014,28(5):63-67(in Chinese).李松坤,王小平,王丽军,等.长余辉发光材料的研究进展[J].材料导报,2014,28(5):63-67.
[6] Jonathan Wood.The top ten advances in materials science[J].Materials Today,2008,11:40-45.
[7] Wang Fei,Zhou Zhiyong,Zeng Qun,et al.Preparation and properties of Eu-doped 5Li2O-1Nb2O5-5TiO2 ceramics[J].Chinese Journal of Luminescence,2017,38(3):269-273(in Chinese).王飞,周志勇,曾群,等.Eu3+掺杂5Li2O-1Nb2O5-5TiO2发光陶瓷的制备及性能研究[J].发光学报,2017,38(3):269-273.
[8] Hu S,Lu C,Qin X,et al.Color tuning of Lu3Al5O12∶Dy3+ ceramic-based white light-emitting phosphors via Yb incorporation[J].Journal of the European Ceramic Society,2017,37(1):229-237.
[9] Timilsina S,Bashnet R,Kim S H,et al.A life-time reproducible mechano-luminescent paint for the visualization of crack propagation mechanisms in concrete structures [J].International Journal of Fatigue,2017,101:75-79.
[10] Ebrahimzade A,Mojtahedi M R M,Rahbar R S.Preparation and characterisation of luminous polypropylene/phosphor strontium aluminate nanocomposite fibres with enhanced dyeability [J].Plastics Rubber & Composites,2016,45(8):368-373.
[11] Kogh S M,Fundal E.A photo-luminescent calcium silicate material,concrete and gravel material containing it and a method of producing a photo-luminescent calcium silicate material:0584067[P].1994-03-02.
[12] Timilsina S,Bashnet R,Kim S H,et al.A life-time reproducible mechano-luminescent paint for the visualization of crack propagation mechanisms in concrete structures[J].International Journal of Fatigue,2017,101:75-79.
[13] Wiese A S.Assessing the performance of sustainable and luminescent concrete sealers[D].West Lafayette:Purdue University,2015.
[14] Steyn W J.Development of auto-luminescent surfacings for concrete pavements[J].Transportation Research Record Journal of the Transportation Research Board,2008,2070:22-31.
[15] Pan Yinghao.Luminescent and reflective concrete floor tiles and its production methods:CN1587162[P].2005-03-02(in Chinese).潘英豪.发光反光混凝土地面砖及其生产方法:CN1587162[P].2005-03-02.
[16] Dai Longjun,Zhao Dyijia,Du Sujun,et al.A kind of energy storage luminescent coating for tunnel and its preparation method:CN103205176[P].2013-05-09(in Chinese).代隆军,赵队家,杜素军,等.一种隧道用蓄能发光涂料及其制备方法:CN103205176[P].2013-05-09.
[17] Wang Xingang,Chen Fangbin,Zhang Weiqin,et al.Mechanical and optical properties of luminescent and transparent cementitious materials [J].Journal of China University of Mining & Technology,2013,42(2):195-199(in Chinese).王信刚,陈方斌,章未琴,等.发光透光水泥基材料的力学性能与光学特性[J].中国矿业大学学报,2013,42(2):195-199.
[18] Wang Qian.Preparation and performance research of the luminescent concrete [D].Shenyang:Shenyang Jianzhu University,2013(in Chinese).王倩.发光混凝土的制备及性能研究[D].沈阳:沈阳建筑大学,2013.
[19] Gao Yingli,He Bei,Xao Minqiang,et al.Study on properties and mechanisms of luminescent cement-based pavement materials with super-hydrophobic function [J].Construction & Building Materials,2018,165:548-559.
[20] Chen Xue,Hu Yihua,Wang Yinhai,et al.Valence state change of Eu and its effect on the luminescent properties of long afterglow phosphor SrAl2O4∶Eu,Dy [J].Chinese Journal of Luminescence,2009,30(1):40-46(in Chinese).陈雪花,胡义华,王银海,等.长余辉材料SrAl2O4∶Eu,Dy中Eu的价态变化及对发光性能的影响[J].发光学报,2009,30(1):40-46.