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首页> 外文期刊>Magazine of Concrete Research >Blending different fineness cements to engineer the properties of cement-based materials
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Blending different fineness cements to engineer the properties of cement-based materials

机译：掺合不同细度的水泥以设计水泥基材料的性能

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摘要

Concretes are designed to fulfil specific engineering requirements, commonly exemplified by slump, unit weight and compressive strength. One source of untapped potential for varying engineering properties of hardened concrete is the variation of the cement particle size distribution. In this study, the performance of cements prepared by blending a coarse ASTM C150 type Ⅰ/Ⅱ and a fine type Ⅲ cement obtained from the same clinker in three different proportions is examined. Evaluated properties for pastes and mortars include compressive strength and a variety of early-age properties that can influence cracking, specifically isothermal and semi-adiabatic calorimetry, chemical shrinkage, setting times (Vicat needle) and autogenous deformation. Addition of a high-range water reducer to the type Ⅲ cement and the two finest blends is investigated as a secondary variable. The properties of the blends are compared with those of the two pure starting materials using a law of mixtures. Some properties such as heat release (as assessed using isothermal calorimetry) and chemical shrinkage are predicted nearly perfectly by applying this simple law. Others such as peak temperature (as assessed using semi-adiabatic calorimetry) and compressive strength are adequately predicted for engineering purposes by application of the law. Finally, setting times and autogenous deformation, being dependent on both hydration rates and particle spacing, cannot be predicted by the simple law of mixtures. It is concluded that a wide range of performance properties can be achieved by the blending of a fine and a coarse cement in controlled proportions.
机译：混凝土的设计满足特定的工程要求，通常以坍落度，单位重量和抗压强度为例。改变硬化混凝土工程特性的未开发潜力之一是水泥粒度分布的变化。在这项研究中，研究了以三种不同的比例混合由同一熟料获得的ASTM C150粗Ⅰ/Ⅱ型和细Ⅲ型水泥制得的水泥的性能。糊和砂浆的评估性能包括抗压强度和各种会影响龟裂的早期性能，特别是等温和半绝热量热法，化学收缩率，凝固时间（维卡针）和自生变形。研究了将高减水剂添加到Ⅲ型水泥和两种最佳掺合料中作为次要变量。利用混合物定律将共混物的性质与两种纯起始原料的性质进行比较。通过应用此简单定律，几乎可以完美地预测一些特性，例如放热（使用等温量热法评估）和化学收缩。通过应用该法则，工程上可以充分预测峰值温度（使用半绝热量热法评估）和抗压强度等其他指标。最后，取决于水合速率和颗粒间距的凝固时间和自生变形不能通过简单的混合物定律预测。结论是，通过将细水泥和粗水泥以受控的比例混合可以实现广泛的性能。

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  • 来源
    《Magazine of Concrete Research》 |2010年第5期|p.327-338|共12页
  • 作者

    D. P. Bentz;

  • 作者单位

    Building and Fire Research Laboratory, National Institute of Standards and Technology, 100 Bureau Drive Stop 8615, Gaithersburg, MD 20899-8615, USA;

  • 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
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