Experimental investigation on autogenous shrinkage of high and ultra-high strength concrete

机译：高强强度混凝土自体收缩的实验研究

获取原文

页面导航

摘要
著录项
相似文献
相关主题

摘要

Recent trends in concrete technology have been towards high-strength concrete and ultra-high strength concrete with a low water-cement ratio. However, these high and ultra-high strength concretes have some problems. One of the problems is early-age cracking due to autogenous shrinkage. This study presents the results of an experimental investigation carried out to evaluate the autogenous shrinkage of high and ultra-high strength concrete. Main ideas on autogenous shrinkage are based on the use of ordinary Portland cement, but it has already become apparent that mineral admixtures and fibers change the behavior significantly. Variables were taken to study its effect on shrinkage like (effects of water/cement ratio, cement content, coarse aggregate content, silica fume percentage and steel fiber). From the test results, it is concluded that the autogenous shrinkage strain of mixes increases with decrease w/c ratio and decrease with increasing w/c ratio and concrete with the higher value of cement content, shows greater amounts of shrinkage. The autogenous shrinkage strain increases with decreasing of the coarse aggregate content. The additions of 10-20 % of silica fume to the mix increase the autogenous shrinkage strains of concrete specimens. The autogenous shrinkage decreased gradually with the increase of steel fiber content.

机译：最近的混凝土技术趋势一直朝着高强度混凝土和超高强度混凝土，水水泥比例低。然而，这些高和超高强度的混凝土存在一些问题。其中一个问题是由于自体收缩引起的早期裂缝。本研究介绍了进行实验研究的结果，以评估高和超高强度混凝土的自生收缩。关于自动收缩的主要思想是基于普通波特兰水泥的使用，但显而易见的是，矿物混合物和纤维显着改变行为。采取变量研究其对收缩效果的影响（水/水泥比，水泥含量，粗骨料含量，二氧化硅烟雾百分比和钢纤维的影响）。从测试结果中，得出结论，混合物的自生收缩应变随降低的比率而增加，随着水泥含量较高的增加，随着水泥含量越来越多的情况而降低，显示出更多的收缩量。随着粗骨料含量的降低，自生收缩应变增加。添加10-20％的二氧化硅烟气，混合增加了混凝土样本的自生收缩菌株。随着钢纤维含量的增加，自生收缩逐渐降低。

著录项

来源
《International Conference on Materials Engineering and Science》|2019年|860 p.|共11页
会议地点
作者
Ola Adel Qasiin;
展开▼
作者单位

展开▼
会议组织
原文格式 PDF
正文语种
中图分类工程材料学;
关键词
High; Ultra High-Strength Concrete; Autogenous Shrinkage; Silica Fume; Strain and Steel Fiber.;

机译：高的;超高强度混凝土;自生收缩;二氧化硅烟;应变和钢纤维。;

相似文献

外文文献
中文文献
专利

1. Experimental investigation on the autogenous shrinkage of steam cured ultra-high performance concrete [J] . Shen Peiliang, Lu Linnu, He Yongjia, Construction and Building Materials . 2018,第FEBa20期

机译：蒸养超高性能混凝土自生收缩的试验研究
2. Influence of external water introduced by coral sand on autogenous shrinkage and microstructure development of Ultra-High Strength Concrete (UHSC) [J] . Liu Kaizhi, Yu Rui, Shui Zhonghe, Construction and Building Materials . 2020,第Auga20期

机译：珊瑚砂引入的外部水对超高强度混凝土自体收缩和微观结构开发（UHSC）
3. Autogenous Shrinkage, Microstructure, and Strength of Ultra-High Performance Concrete Incorporating Carbon Nanofibers [J] . Jacob L. G. Lim, Sudharshan N. Raman, Md. Safiuddin, Materials . 2019,第2期

机译：掺碳纳米纤维的超高性能混凝土的自发收缩，微观结构和强度
4. Experimental investigation on autogenous shrinkage of high and ultra-high strength concrete [C] . Ola Adel Qasiin International Conference on Materials Engineering and Science . 2019

机译：高强强度混凝土自体收缩的实验研究
5. Creep of high strength concrete and autogenous shrinkage of cement paste. [D] . Fakhari, Maryam. 2013

机译：高强度混凝土的蠕变和水泥浆的自生收缩。
6. Autogenous Shrinkage Microstructure and Strength of Ultra-High Performance Concrete Incorporating Carbon Nanofibers [O] . Jacob L. G. Lim, Sudharshan N. Raman, Md. Safiuddin, 2019

机译：掺碳纳米纤维的超高性能混凝土的自发收缩微观结构和强度
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. Early Age Autogenous Shrinkage of Concrete. [R] . Holt, E. E. 2001

机译：混凝土早期自收缩。

Experimental investigation on autogenous shrinkage of high and ultra-high strength concrete

摘要

著录项

相似文献

相关主题

期刊订阅