Concrete meso-structure characteristics and mechanical property research with numerical methods

Ren Qingwen; Li Qiang; Yin Yajuan

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Concrete meso-structure characteristics and mechanical property research with numerical methods

机译：混凝土细观结构特征及力学性能的数值方法研究

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Concrete meso-structure significantly affects its mechanical property, as crack generally starts and develops basically along the interface between aggregate and mortar on the meso-scale. The cracking path is highly dependent on the interface structure, the main component of concrete meso-structure. Since the interface is formed due to aggregate distributing in mortar mix, the relation between aggregate surface area and interface perimeter could be considered as a representative index of concrete meso-structure. As it is too complicated to adopt traditional methods to represent this relation, in order to better understanding the influence of meso-structure change on mechanical property, fractal theory is introduced to explore the relationship, with the main focus on the characteristics of the concrete meso-structure and its influence on mechanical property. Results show that the specimen size has great impact on meso-structure and mechanical property, while the influence of aggregate volume fraction can be neglected. It is more obvious in larger specimen size that aggregate volume fraction increase could contribute a lot to bearing capacity improving and whole stress level descending. Besides, aggregate volume fraction increase could improve the local cracking stress, but reduce the cracking strain, resulting in cracking brittleness. (C) 2017 Elsevier Ltd. All rights reserved.

机译：混凝土的细观结构会显着影响其机械性能，因为裂纹通常在细观尺度上沿着集料和砂浆之间的界面开始并基本沿裂纹发展。开裂路径高度依赖于界面结构，这是混凝土细观结构的主要组成部分。由于界面是由于骨料在砂浆混合物中的分布而形成的，因此骨料表面积与界面周长之间的关系可以视为混凝土细观结构的代表指标。由于采用传统方法来表示这种关系太复杂了，为了更好地理解细观结构变化对力学性能的影响，引入了分形理论来探讨这种关系，主要关注混凝土细观的特性。结构及其对机械性能的影响。结果表明，试件尺寸对细观结构和力学性能影响很大，而骨料体积分数的影响可以忽略。在较大的样本尺寸中，更明显的是，总体积分数的增加可能对承载力的提高和整体应力水平的下降有很大贡献。此外，骨料体积分数的增加可以改善局部开裂应力，但减小开裂应变，导致开裂脆性。（C）2017 Elsevier Ltd.保留所有权利。

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来源
《Construction and Building Materials》 |2018年第15期|189-197|共9页
作者
Ren Qingwen; Li Qiang; Yin Yajuan;
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作者单位

Hohai Univ, Dept Engn Mech, Nanjing 210098, Jiangsu, Peoples R China;

Hohai Univ, Dept Engn Mech, Nanjing 210098, Jiangsu, Peoples R China|China Construct Third Bur Green Ind Investment Co, Wuhan, Hubei, Peoples R China;

Hohai Univ, Dept Hydraul Struct Engn, Nanjing 210098, Jiangsu, Peoples R China;

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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
关键词
Meso-structure; Fractal theory; Mechanical property; Numerical model; Concrete;

机译：细观结构;分形理论;力学性能;数值模型;混凝土;

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2. Predicting the mechanical properties of ordinary concrete and nano-silica concrete using micromechanical methods [J] . M LEZGY-NAZARGAH, S A EMAMIAN, E AGHASIZADEH, Sadhana . 2018,第12期

机译：用微力学方法预测普通混凝土和纳米二氧化硅混凝土的力学性能
3. Predicting the mechanical properties of ordinary concrete and nano-silica concrete using micromechanical methods [J] . Lezgy-Nazargah M., Emamian S. A., Aghasizadeh E., Sadhana: Academy Proceedings in Engineering Science . 2018,第12期

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4. Mechanical Impulse Technique Used to determine the Elastique Characteristics of Welded Steel Bars of Concrete Reinforcements Compared with those Obtained by Analytical, Numerical and Experimental Methods [C] . Raul Moisa, Sergiu Gălăţanu, Dorin Simoiu, IEEE International Symposium on Applied Computational Intelligence and Informatics . 2021

机译：用于确定混凝土增强件焊接钢筋的弹性特性的机械脉冲技术与分析，数值和实验方法所获得的
5. Mechanical Property Development and Numerical Modeling of Ultra-High Performance Concrete Focused on Isothermal Curing Conditions [D] . Allard, Thomas 2018

机译：等温固化条件下超高性能混凝土的力学性能发展与数值模拟
6. Numerical Simulation of Dynamic Mechanical Properties of Concrete under Uniaxial Compression [O] . Yijiang Peng, Qing Wang, Liping Ying, 2019

机译：混凝土单轴压缩动力力学特性的数值模拟
7. Mechanical properties of various concrete after high temperature exposure Mechanical property of various types of concrete after high temperature exposure is investigated. Considering compressive strength requirement for a vertical element in high rise building, concrete specimens with various design strengths of 35, 80, 100, and 150 MPa were tested. Particularly, the influence of incorporated steel fiber on fire resistance is of interest in this study. Experimental results show that the fire resistance depends on the design strength and steel fiber content. Normal strength concrete (NSC) of a design strength of 35 MPa or high performance concrete (HPC) of 80-100 MPa does not spall when exposed to 100-400 °C of temperature. However, an explosive spalling occurs at 300 °C when the HPCs contain 1 vol. of steel fiber. Ultra-high performance concrete (UHPC) of a design strength of 150 MPa and 1.5 vol. of steel fiber also shows dramatic spalling at 300 °C. The experimental results found in this study can contribute to a better understanding of the behaviors of HPC and UHPC under fire and the role of steel fiber on the fire resistance. [O] . 2017

机译：研究了高温暴露后各种混凝土高温曝光机械性能各种混凝土的机械性能。考虑到高层建筑中垂直元件的抗压强度要求，测试了35,80,100和150MPa各种设计强度的混凝土试样。特别是，在这项研究中，掺入钢纤维对耐火性的影响。实验结果表明，耐火性取决于设计强度和钢纤维含量。在暴露于100-400°C的温度时，80-100MPa的设计强度为35MPa或高性能混凝土（HPC）的正常强度混凝土（NSC）不会击落。然而，当HPC含有1体积的钢纤维的百分比时，爆炸性剥落发生在300℃。超高性能混凝土（UHPC）的设计强度为150 MPa和1.5 Vol。钢纤维的百分比也显示出300℃的剧烈剥落。本研究中发现的实验结果可以有助于更好地了解在火灾中的HPC和UHPC的行为以及钢纤维对耐火性的作用。
8. Method for Estimating the Mechanical Properties of a Solid Material Subjected to Significant Compressional Forces - Part I: Numerical Theoretical Solution for a Single Thick Plate. [R] . Hull, A. J. 2003

机译：估算受到显着压缩力作用的固体材料力学性能的方法 - 第一部分：单厚板的数值理论解。

Concrete meso-structure characteristics and mechanical property research with numerical methods

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