Micro Enhancement Mechanism and Strength Calculation Method of Fiber and Nanosized Material Reinforced Concrete(PDF)
《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]
- Issue:
- 2015年05期
- Page:
- 47-55
- Research Field:
- Publishing date:
Info
- Title:
- Micro Enhancement Mechanism and Strength Calculation Method of Fiber and Nanosized Material Reinforced Concrete
- Author(s):
- GAO Dan-ying; LI Han
- Research Center of New Style Building Material & Structure, Zhengzhou University
- Keywords:
- fiber and nanosized material reinforced concrete; mechanical property; micro enhancement mechanism; slump
- PACS:
- -
- DOI:
- -
- Abstract:
- By combining the micro analysis and macro property experiments, the effect of steel fiber volume fraction and nanosized material content on the micro mechanism and physical and mechanical properties of fiber and nanosized material reinforced concrete (FNMRC) was investigated. Based on the mechanics theory of composite materials and the regression analysis of related literatures, a model for strength calculation of FNMRC was proposed, which considered the effect of nanosized materials and steel fiber. The results show that the suitable combined usage of nanosized materials with steel fiber improves the microstructure of concrete, increases its densification and enhances the physical and mechanical properties. With the increase of steel fiber volume fraction from 0% to 1.5%, the mixture slump decrease from 40 mm to 25 mm, and the compressive strength, splitting tensile strength and flexural strength of FNMRC increase by 12%, 32% and 12.5%, respectively. With the increase of nanoSiO2 content (mass fraction) from 0% to 2%, the mixture slump reduces 95 mm, and the initial and final setting time reduce 52.3% and 35.9%, respectively, and the compressive strength, splitting tensile strength and flexural strength of FNMRC increase 9%, 24% and 14.7%, respectively. With the increase of nanoCaCO3 content from 0% to 2%, the mixture slump reduces 50 mm, and the initial and final setting time reduce 35.2% and 3.8%, respectively, and the compressive strength, splitting tensile strength and flexural strength of FNMRC increase 8%, 20% and 8.8%, respectively.
Last Update: 2015-09-29