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Methodology to evaluate variations in concrete color caused by white cement substitutions and forming materials

机译：用白色水泥取代和成形材料评估混凝土颜色变化的方法

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摘要

An experimental program was conducted to develop a methodology to quantify the gradation of the concrete color. The proposed methodology was used to evaluate the effect of the supplementary cementitious materials and the limestone filler used as partial substitution of white cement in architectural precast concrete. The effect of the formwork materials on concrete color was also investigated. Conventional concrete mixtures were prepared using different binder types, including gray-high early strength cement, white cement, limestone filler, blast-furnace slag, and metakaolin, to evaluate the compressive strength development that are suitable for the precast architectural applications. The corresponded paste mixtures were prepared to evaluate the variations in concrete color with the time under the air-curing conditions. The proposed methodology was found to provide precise classification for color gradation of concrete. The ternary powder blend of 50% high early strength cement, 25% white cement, and 25% high Blaine limestone filler, by mass, was found to be optimal to achieve reasonable white tint in compensation with the need to retain high early strength. A superworkable concrete and two self-consolidating concrete mixtures were cast in a specialZ-shaped mold built up using PVC, steel, plywood, and polyester filter liner. The color of concrete surfaces cast in the plywood and polyester filter lined formwork materials were found darker than that of the concrete cast in the PVC and steel formworks.
机译：进行了实验计划，以制定一种方法来量化混凝土颜色的渐变。所提出的方法用于评估补充水泥材料和石灰石填料在建筑预制混凝土中用作白色水泥的部分取代的影响。还研究了模板材料对混凝土颜色的影响。使用不同的粘合剂类型制备常规的混凝土混合物，包括灰度高早强水泥，白色水泥，石灰石填料，高炉炉渣和甲状腺素，以评估适用于预制架构应用的抗压强度。准备相应的糊状混合物以评估混凝土颜色的变化与空气固化条件下的时间。发现所提出的方法论为混凝土的颜色渐变提供了精确的分类。在50％的高温水泥，25％白色水泥和25％高Blaine石灰石填料的三元粉末混合物被发现是最佳的，以便在补偿中实现合理的白色色调，需要保持高早期强度。在使用PVC，钢板，胶合板和聚酯过滤衬垫上建立的Specialz形模具中铸造了可加加工的混凝土和两个自合并混凝土混合物。在胶合板和聚酯过滤器衬里模板材料中铸造的混凝土表面的颜色比PVC和钢板塑料中的混凝土塑造更暗。

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