机场道面浅层高早强快速修补砂浆的性能研究

在满足繁忙机场不停航施工要求下,制备出道面浅层高早强快速修补砂浆对保障飞机准点运行及安全起降具有重要意义。采用自制的特种胶凝材料,通过优选砂胶比、水胶比及外加剂复配等技术制备出高早强快速修补砂浆,研究该修补砂浆的力学性能、黏结性能与耐久性能。结果表明:高早强快速修补砂浆2h抗压、抗折强度分别为32.5MPa和4.8MPa,且2h和28d黏结强度可分别达到其抗折强度的75%和84%;与C40混凝土相比,该修补砂浆早期具有微膨胀性,可补偿收缩,减小与旧混凝土间变形差异,120d收缩率降低了60.5%,3d耐磨性可达到C40混凝土28d的耐磨性,且具有优良的抗渗性与抗冲击性。

The performance of high early strength quick repair mortarfor shallow damage of airport pavement

In view of the characteristics of the damage to the shallow layer of the airport and the requirements of the repair technology, the high early strength and rapid repair mortar prepared by the self-made special cementitious material has reached 32.5MPa and 4.2MPa of the compressive strength and flexural strength of 2h respectively. Then, the bonding property and durability of the mortar were studied. The results showed that the bonding strength of 2h and 28d of high early strength rapid repair mortar reached 62% and 79% of flexural strength respectively. Compared with C40 concrete, the mending mortar has a micro expansibility in the early stage, the compensation interface shrinkage, the decrease of 120d shrinkage by 60.5%, and the wear resistance of 3d can reach the wear resistance of C40 concrete 28d, and it has excellent permeability resistance and impact resistance.