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首页> 外文期刊>Magazine of Concrete Research >Strength impairment of concrete mixed in hot weather: relation to porosity of bulk fresh concrete paste and maturity
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Strength impairment of concrete mixed in hot weather: relation to porosity of bulk fresh concrete paste and maturity

机译:高温天气下混凝土的强度损伤:与散装新鲜混凝土浆的孔隙率和成熟度的关系

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摘要

Normal-strength concrete mixed in summer can be less strong than the annual average. One cause of these variations is the effect on concrete strength of the temperature of the constituents. Concretes were cast at different temperatures because of different temperatures of the constituents. The slump value, which is the criterion for acceptance on the building site, was kept constant whatever the initial temperature may be, either by the addition of water or by the use of a plasticiser at the end of mixing. Concretes were cured for 24 h under either the conditions specified in the French standard for manufacturing control or simulated hot weather conditions, and then stored in water at 20℃ up to the time of test. Compressive strength was determined at 1, 7 and 28 day ages on 11 X 22 cm cylinders. The results show that the decrease in strength is dependent on the combined effective water and air content of the bulk paste of fresh concrete, and on the maturity of the concrete, which is influenced by its temperature history. By combining two classical relations: strength and design factors (Feret's relation) and strength and maturity (Arrhenius Law), decreases in strength could be analysed for any mixing and curing conditions.
机译:夏季掺入的普通强度混凝土的强度可能不及年平均强度。这些变化的原因之一是对成分温度的混凝土强度的影响。由于组分的温度不同,所以混凝土在不同的温度下浇铸。坍落度值是建筑工地可接受的标准,无论初始温度如何,均可通过添加水或在混合结束时使用增塑剂将其保持恒定。在用于制造控制的法国标准规定的条件下或模拟的炎热天气条件下,将混凝土固化24小时,然后直到测试时才在20℃的水中储存。在1 X,7和28日龄下,在11 X 22 cm圆柱体上确定抗压强度。结果表明,强度的降低取决于新鲜混凝土散装浆糊的有效水和空气含量,以及混凝土的成熟度,而该成熟度受其温度历史的影响。通过结合两个经典关系:强度和设计系数(Feret关系)以及强度和成熟度(阿伦尼乌斯定律),可以分析任何混合和固化条件下强度的降低。

著录项

  • 来源
    《Magazine of Concrete Research》 |2003年第3期|p.215-223|共9页
  • 作者单位

    Laboratory of Materials and Durability of Constructions, INSA/UPS, Dpt of Civil Engineering, Av. de Rangueil, 31077 Toulouse, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 水泥工业;
  • 关键词

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