矿物双掺对超早强修复砂浆性能影响研究

水泥道面在环境及荷载耦合作用下频繁出现起砂露石等病害,目前修复材料因耐久性差、环境污染严重,不宜大面积推广.针对上述问题,研究了不同比例矿物外掺料复掺对超早强修复砂浆工作性能、力学性能及耐久性能的影响.结果表明,矿物外掺料的加入延长了砂浆的可操作时间,降低了砂浆的扩展度;对抗折、抗压早期强度影响显著,但28d强度逐渐赶上普通修复砂浆;矿物掺合料的掺入能够明显改善和提高修复砂浆的抗渗和干缩性能.当粉煤灰和矿粉以2∶1比例复掺时,性能最为优异.

Study of the Impact of Mineral Double Mixing to the Performance of the Super Early Strength Repair Mortar

Cement road surface frequently turn up sand stone and other diseases under the effect of environment and load coupling,and the restorative materials are unfavorable to promotion in large area because of their poor durability,serious environmental pollution.Aiming at these problems,the effect of mineral admixture in different proportion to the working properties,mechanical properties and durability performance of super early strength of repair mortar was studied.The results showed that the addition of mineral admixtures extended the operation time of mortar,and reduced the spread of mortar.What＇s more,the mineral admixtures have great effect on early breaking strength and compressive strength,but its 28 dstrength gradually catch up with the normal repair mortar.In addition,the incorporation of mineral admixtures can obviously improve and raise the permeability and drying shrinkage performance of repair mortar.When fly ash and mineral powder were mixed in the ratio of2∶1,the performance of mortar is the most excellent.