低收缩高黏结黑色高性能混凝土的性能试验研究
Experimental Study on Performance of Low Shrinkage and High Bond Black High Performance Concrete
关键词：
黑色混凝土；黏结强度；收缩；色泽；耐磨损；高性能
Key words：
Black concrete; Bond strength; Shrinkage; Color; Wear resistance; High performance
刊期：
２０19年第12期
DOI：
10.19761/j.1000-4637.2019.12.012.06
文章编号：
基金项目：
国家重点研发计划（2016YFC0701907）。
作者：
夏中升1,2，沙建芳1,2，刘建忠1,2，郭 飞1,2，徐海源1,2
单位：
1.高性能土木工程材料国家重点实验室，南京 210008；2.江苏苏博特新材料股份有限公司， 南京 211103
摘要
Abstract: The influence mechanism of colorants, admixtures and mix parameters on the surface color and workability of concrete, as well as its influence on the mechanical properties, shrinkage and deformation properties and wear resistance of concrete were studied. In addition, the influence of interface roughness and drying state on the bonding properties of new and old concrete interface was studied by different pretreatment methods of existing concrete interface. The results show that high content of iron black reduces the mechanical properties of concrete, and the combination of carbon black and iron black helps to improve the mechanical properties. The addition of colorant particles helps to form calcium hydroxide crystals, but has little effect on ettringite. The abrasion resistance of concrete is related to the test parameters such as water-binder ratio and air content. Reducing the air content of slurry and choosing appropriate water-binder ratio to obtain higher matrix strength can improve the abrasion resistance of concrete. By using hydration temperature rise inhibitor and high performance expansion agent, shrinkage suppression compensation can be realized in the whole stage. Higher strength grade of interfacial concrete, greater surface roughness and surface pre-wetting treatment are helpful to improve the interfacial bonding performance of new and old concrete.
结论
（1）高掺量的铁黑着色剂颜料（40 kg/m3）显著降低混凝土的力学性能，相比于空白组，抗压、抗弯强度分别降低14.9%和9.8%。采用铁黑与碳黑颜料复配方案，混凝土抗压、抗弯强度均高于空白试验组。着色剂粒子的加入有助于氢氧化钙的结晶形成，但对于钙矾石影响较小。
（2）用水化温升抑制剂和高性能膨胀剂联合使用措施，实现全阶段全过程收缩抑制补偿，解决早期塑性收缩及后期干缩大的问题，降低开裂风险。
（3）水胶比、含气量等试验参数影响混凝土的耐磨损性能，选取合理的水胶比来获得较高的基体强度，降低浆体含气量来增加基体密实度，从而提升混凝土的耐磨损性能。
（4）较高的界面混凝土强度等级，较大的表面粗糙度以及保持表面饱水状态，有助于提高新旧混凝土界面黏结性能。
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引用本文
夏中升,沙建芳,刘建忠,等.低收缩高黏结黑色高性能混凝土的性能试验研究[J].混凝土与水泥制品,2019(12):12-17.
XIA Z S,SHA J F,LIU J Z,et al.Experimental Study on Performance of Low Shrinkage and High Bond Black High Performance Concrete[J].China Concrete and Cement Products,2019(12):12-17.
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