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Development of structure-property relationships for hydrated cement paste, mortar and concrete.

机译：水合水泥浆，砂浆和混凝土的结构-特性关系的发展。

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摘要

A mechanistic approach was adopted to develop models for the mechanical properties of hydrated cement paste, mortar and concrete. These models reflect the fundamental structure of concrete, and represent a departure from the predominantly empirical models available for cement-based materials. The intrinsic elastic modulus and fracture toughness of hydrated cement paste were determined based on the interatomic interactions between calcium silicate hydrate (C-S-H) particles, which are the primary binder among the hydration products of cement. The elastic modulus model of hydrated cement paste was developed by introducing the effect of elliptical capillary pores into the corresponding intrinsic model. The fracture toughness model of hydrated cement paste was also developed by introducing the energy dissipation associated with the C-S-H/C-S-H debonding and the phononic frictional pullout of calcium hydroxide (CH) crystals, with the latter phenomenon found to be the major contributor. The strength of hydrated cement paste was determined using the elastic fracture mechanics principles. Experimental results and available empirical models were used to validate the models. Mechanical models for cement mortar were developed by introducing the effects of fine aggregate on hydrated cement paste. The elastic modulus model of cement mortar accounts for the positive effects of the high elastic modulus fine aggregates, and the negative effects of the interfacial transition zone. The fracture toughness model of cement mortar was developed by introducing the energy dissipation associated with the pull-out of fine aggregates into the fracture toughness model of hydrated cement paste. The strength model of cement mortar was developed using the elastic modulus and fracture toughness models based on fracture mechanics concepts, with due consideration given to the effects of fine aggregates in restrained shrinkage microcracking of cement mortar. Experimental results and empirical models were used to verify the mechanistic models of cement mortar. The mechanistic models of concrete were developed based on the corresponding models of cement mortar by introducing various effects of coarse aggregates. The fracture toughness model of concrete accounted for the energy dissipation associated with pullout of coarse aggregates from cement mortar. The approach to development of elastic modulus and strength models was similar to that used for development of the corresponding models of cement mortar. The predictions of the mechanistic models of concrete compared favorably with experimental results. The mechanistic models of concrete were tailored for application to high-volume fly ash concrete, and were used to determine the effects of high-volume replacement of cement with coal fly ash on the mechanical properties of concrete. Some comparisons were also made between the predictions of the mechanistic models and the test data available for high-volume fly ash concrete.
机译：采用机械方法来开发水合水泥浆，砂浆和混凝土的机械性能模型。这些模型反映了混凝土的基本结构，并且与水泥基材料的主要经验模型不同。基于水合硅酸钙（C-S-H）颗粒之间的原子间相互作用，确定水合水泥浆的固有弹性模量和断裂韧性，水合硅酸钙是水泥水合产物中的主要粘合剂。通过将椭圆形毛细孔的影响引入相应的固有模型，开发了水合水泥浆的弹性模量模型。还通过引入与C-S-H / C-S-H脱键和氢氧化钙（CH）晶体的声子摩擦拔出有关的能量耗散，开发了水合水泥浆的断裂韧性模型，发现后者是主要的原因。使用弹性断裂力学原理确定水合水泥浆的强度。实验结果和可用的经验模型用于验证模型。通过引入细骨料对水合水泥浆的影响，开发了水泥砂浆的力学模型。水泥砂浆的弹性模量模型说明了高弹性模量细骨料的正效应和界面过渡区的负效应。水泥砂浆的断裂韧性模型是通过将与细骨料拉出有关的能量耗散引入水化水泥浆的断裂韧性模型中而建立的。水泥砂浆的强度模型是基于断裂力学的概念，使用弹性模量和断裂韧性模型开发的，同时充分考虑了细骨料对水泥砂浆收缩收缩微裂纹的影响。利用实验结果和经验模型对水泥砂浆的力学模型进行了验证。通过引入粗骨料的各种作用，在相应的水泥砂浆模型的基础上建立了混凝土的力学模型。混凝土的断裂韧性模型考虑了与从水泥砂浆中拉出粗骨料有关的能量耗散。弹性模量和强度模型的开发方法与水泥砂浆相应模型的开发方法相似。混凝土力学模型的预测与实验结果相吻合。针对混凝土的力学模型进行了量身定制，以应用于大粉煤灰混凝土，并用于确定煤粉煤灰大量替代水泥对混凝土力学性能的影响。机理模型的预测与可用于大粉煤灰混凝土的试验数据之间也作了一些比较。

著录项

  • 作者

    Ghebrab, Tewodros Tekeste.;

  • 作者单位

    Michigan State University.;

  • 授予单位 Michigan State University.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 225 p.
  • 总页数 225
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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