沥青路面表面用疏水涂层制备与评价
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摘要
为了提高沥青路面水稳定性,以有机硅树脂和甲基硅酸钠为原料,制备了沥青路面表面用疏水涂层;采用图像法分别测定了涂抹不同配比疏水涂层沥青混合料试块表面与水的接触角,通过吸水率、浸水马歇尔和冻融劈裂试验评价了沥青混合料试样涂抹疏水涂层后水稳定性,使用手工铺砂法和摆氏摩擦系数仪法分析了疏水涂层对沥青路面表面抗滑性的影响。结果表明:涂抹制备的两种疏水涂层试块表面与水的接触角均大于90°,且明显高于未涂抹试块,显示出良好的疏水效果;涂覆两种疏水涂层的沥青混合料试件的吸水率均降低,水稳定性有所改善,但试件表面构造深度和摆值均有一定程度衰减,在实际应用时应综合考虑疏水效果和抗滑性衰减。
In order to improve the water stability of asphalt pavement,the hydrophobic coatings on asphalt pavement surface were prepared with silicone resin and sodium methyl silicate. The image method was used to measure the contact angle between water and surface of the asphalt mixture blocks painted with different proportion of hydrophobic coatings. Water absorption test,Immersion Marshall test and freeze-thaw splitting test were carried out to evaluate the water stability of the asphalt mixture samples with hydrophobic coatings. Additionally,the effect of hydrophobic coatingon the anti-skid property of asphalt pavement surface was analyzed by sand patch test and pendulum test. The results show that the contact angles between the blocks surface painted with the two types of prepared hydrophobic coatings and water are both larger than 90 ° and obviously higher than those of the controlled samples,which exhibits good hydrophobic effect. The water absorption rates of the asphalt mixture samples coated with the two types of hydrophobic coatings are reduced,and the water stability is improved. Slight decrements of texture depth and pendulum value of specimen surface are observed. Therefore,it is important to balance the hydrophobic effect and skid-resistance decrement when these materials are applied to practical engineering.
In order to improve the water stability of asphalt pavement,the hydrophobic coatings on asphalt pavement surface were prepared with silicone resin and sodium methyl silicate. The image method was used to measure the contact angle between water and surface of the asphalt mixture blocks painted with different proportion of hydrophobic coatings. Water absorption test,Immersion Marshall test and freeze-thaw splitting test were carried out to evaluate the water stability of the asphalt mixture samples with hydrophobic coatings. Additionally,the effect of hydrophobic coatingon the anti-skid property of asphalt pavement surface was analyzed by sand patch test and pendulum test. The results show that the contact angles between the blocks surface painted with the two types of prepared hydrophobic coatings and water are both larger than 90 ° and obviously higher than those of the controlled samples,which exhibits good hydrophobic effect. The water absorption rates of the asphalt mixture samples coated with the two types of hydrophobic coatings are reduced,and the water stability is improved. Slight decrements of texture depth and pendulum value of specimen surface are observed. Therefore,it is important to balance the hydrophobic effect and skid-resistance decrement when these materials are applied to practical engineering.
引文
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[2]CUI S,BLACKMAN B R K,KINLOCH A J,et al.Durability of asphalt mixtures:Effect of aggregate type and adhesion promoters[J].International Journal of Adhesion and Adhesives,2014,54(5):100-111.
[3]肖庆一,薛航,徐金枝,等.基于表界面理论的沥青路面水损坏模型研究[J].武汉理工大学学报,2007,29(5):71-73.
[4]韩森,刘亚敏,徐鸥明,等.材料特性对沥青—集料界面粘附性的影响[J].长安大学学报(自然科学版),2010,30(3):6-9.
[5]CHENG D X,ITTLE D N,LYTTON R L,et al.Moisture damage evaluation of asphalt mixture by considering both moisture diffusion and repeated load conditions[J].Bituminous Paving Mixtures,2003,1832(1):42-49.
[6]ALEX K A,JANMES R A G,AIREY G D.Moisture-induced strength degradation of aggregate-asphalt mastic bonds[J].Road Materials and Pavement Design,2014,15(1):239-262.
[7]王金凤,李晓民,张国宏,等.基于接触角方法沥青与石料粘附特性及路用性能研究[J].硅酸盐通报,2016,35(8):67-73.
[8]ALEJANDRA B,MAVIS L M,JOSE P A,et al.Influence of bitumen and aggregate polarity on interfacial adhesion[J].Road Materials and Pavement Design,2017,18(2):304-317.
[9]刘亚敏,韩森,彭成坝,等.空隙率对SMA水稳定性的影响[J].广西大学学报(自然科学版),2011,36(1):138-141.
[10]TAREFDER R A,ZAMAN A M.Nanoscale evaluation of moisture damage in polymer modified asphalts[J].Journal of Materials in Civil Engineering,2010,22(7):714-725.
[11]AI-HUMEIDAWI B H,AODAH H H,HAMEED K K,et al.Evaluation of moisture damage and stripping of asphalt concrete prepared with new additives of polymer modified bitumen[J].Journal of Babylon University Engineering Sciences,2016,24(1):117-128.
[12]WASIUDDIN N M,FOGEL C M,ZAMAN M M,et al.Effect of anti-strip additives on surface free energy characteristics of asphalt binders for moisture-induced damage potential[J].Journal of Testing and Evaluation,2007,35(1):36-44.
[13]BARTHLOTT W,NEINHUIS C.Purity of the sacred lotus,or escape from contamination in biological surfaces[J].Planta,1997,202(1):1-8.
[14]LATTHE S S,TERASHIMA C,NAKATA K,et al.Superhydrophobic surfaces developed by mimicking hierarchical surface morphology of lotus leaf[J].Moleculees,2014,19:4256-4283.