PNC-803添加剂对混凝土抗渗性能提升的试验研究

Testing of the PNC-803 Mixture on the Impenetrability Improvement of Concrete

水泥基渗透结晶型添加剂可用于提高混凝土的抗渗性能,为探究渗透结晶型添加剂PNC-803对混凝土抗渗性的影响,通过试验研究了0.8%,1.0%和1.2%掺量下改性混凝土的抗渗等级和相对渗透系数的演化规律,并结合电镜扫描测试观察了掺入PNC-803后改性混凝土的细观结构特征。试验结果表明:PNC-803在0.8%和1.0%掺入量下,混凝土的抗渗等级分别提高2个和7个等级,相对渗透系数分别下降14.5%,35.5%;PNC-803的晶体以线状和片状为主,晶体形状与添加量有关。随掺入量增多晶体趋于细化,晶体结构更加致密。在实际工程中,可以通过掺入少量PNC-803来增强混凝土的抗渗性能,同时需考虑掺入量与混凝土抗渗性能的关系以选择合适的掺量。

Cement-based permeable crystallization mixture can be used for improving impermeability of concretes.In order to study the impenetrability performance of permeated crystalline additives,PNC-803,the impermeability grade and permeability coefficient of different contents of 0.8%,1.0% and1.2% in concretes were tested and the crystal characteristics were observed by SEM.Experimental results show that the impermeability grade of concretes with 0.8% and 1.0% of PNC-803 were increased by 2 and 7 grades,and the permeability coefficients were decreased by 14.5% and 35.5%.The forms of crystals of PNC-803 are mainly the shape of line and flake,related to the contents of PNC-803.More PNC-803 admixture added into the concrete resulted in the increasing formation of smaller crystals and the structural compactness.During engineering practice process,the impenetrability of concretes can be improved by adding a few PNC-803,the relationship of contents of PNC-803 and impenetrability performance should be taken into consideration for choosing right contents of additives.