scholarly journals Reducing the strength and durability loss of high performance ready mix and roller compacted concrete due to early age high temperature curing

2021 ◽  
Author(s):  
Richard Sluce
Keyword(s):  
High Temperature ◽  
High Performance ◽  
High Performance Concrete ◽  
Strength Loss ◽  
Early Age ◽  
Roller Compacted Concrete ◽  
Supplementary Cementing Materials ◽  
Chemical Admixtures ◽  
Strength And Durability ◽  
Ready Mix Concrete

This thesis reports the findings of a study conducted on the effects of mixing and curing high performance concrete at elevated temperature. The purpose of the study was to find solutions to ameliorate the strength and durability loss resulting from high temperature environments. This investigation is broken down into two distinct phases. Phase I consisted of a preliminary mortar investigation followed by Phase IIa which was conducted on ready mix concrete and Phase IIb which studied roller compacted concrete. Phase IIa investigated the ability of supplementary cementing materials and chemical admixtures to mitigate the deleterious effects of curing at high temperature. In contrast, Phase IIb investigated the ability of supplementary cementing materials to reduce the deleterious effects. It was found that supplementary cementing materials were moderately effective at ameliorating strength loss, and performed well in reducing durability loss. The chemical admixtures only performed well in ameliorating strength loss.

scholarly journals Reducing the strength and durability loss of high performance ready mix and roller compacted concrete due to early age high temperature curing

2021 ◽  
Author(s):  
Richard Sluce
Keyword(s):  
High Temperature ◽  
High Performance ◽  
High Performance Concrete ◽  
Strength Loss ◽  
Early Age ◽  
Roller Compacted Concrete ◽  
Supplementary Cementing Materials ◽  
Chemical Admixtures ◽  
Strength And Durability ◽  
Ready Mix Concrete

This thesis reports the findings of a study conducted on the effects of mixing and curing high performance concrete at elevated temperature. The purpose of the study was to find solutions to ameliorate the strength and durability loss resulting from high temperature environments. This investigation is broken down into two distinct phases. Phase I consisted of a preliminary mortar investigation followed by Phase IIa which was conducted on ready mix concrete and Phase IIb which studied roller compacted concrete. Phase IIa investigated the ability of supplementary cementing materials and chemical admixtures to mitigate the deleterious effects of curing at high temperature. In contrast, Phase IIb investigated the ability of supplementary cementing materials to reduce the deleterious effects. It was found that supplementary cementing materials were moderately effective at ameliorating strength loss, and performed well in reducing durability loss. The chemical admixtures only performed well in ameliorating strength loss.

scholarly journals Construction and Performance Monitoring of Innovative Ultra-High-Performance Concrete Bridge

2021 ◽  
Vol 6 (9) ◽  
pp. 121
Author(s):  
Haena Kim ◽  
Byungkyu Moon ◽  
Xinyu Hu ◽  
Hosin (David) Lee ◽  
Gum-Sung Ryu ◽  
...  
Keyword(s):  
High Performance ◽  
Performance Monitoring ◽  
Load Transfer ◽  
High Performance Concrete ◽  
Steel Fibers ◽  
Ultra High Performance Concrete ◽  
The Us ◽  
And Performance ◽  
Strength And Durability ◽  
Ready Mix Concrete

The application of Ultra-High-Performance Concrete (UHPC) materials in rehabilitating bridges and constructing primary bridge components is increasing rapidly across the world because of their superior strength and durability characteristics when compared to regular concretes. However, there have been few new bridges constructed using UHPC materials with regular formworks, ready-mix trucks, and construction equipment. This paper presents a comprehensive report encompassing the design, construction, and performance monitoring of a new bridge constructed in Iowa using a unique UHPC technology that includes steel fibers of two different lengths embedded in the concrete. By using optimized lengths of steel fibers, both the tensile strength and the toughness were increased. The UHPC material was produced with local cement and aggregates in the US using typical ready-mix concrete equipment. This paper discusses the experience gained from the design and construction process including mix design, batching, delivery of steel fibers to the ready-mix concrete batch unit, and post-tensioning of precast slabs at the jobsite. For four years after construction, the joints of the bridge decks were monitored using strain sensors mounted on both sides of the deck joints. The strain values were quite similar between the two sides of each joint, indicating a good load transfer between precast bridge girders. A bridge was successfully constructed using a unique UHPC technology incorporating two different lengths of steel fibers and utilizing local cement and aggregates and a ready-mix truck, and has been performing satisfactorily with a good load transfer across post-tensioned precast girder joints.

Early-Age Autogenous Shrinkage of High-Performance Concrete Columns by Embedded Fiber Bragg-Grating Sensor

2009 ◽  
Vol 419-420 ◽  
pp. 1-4 ◽  
Author(s):  
Ying Wei Yun ◽  
Ii Young Jang ◽  
Seong Kyum Kim ◽  
Seung Min Park
Keyword(s):  
Fiber Bragg Grating ◽  
High Performance ◽  
High Performance Concrete ◽  
Construction Material ◽  
Autogenous Shrinkage ◽  
Strain Sensor ◽  
Bragg Grating ◽  
Early Age ◽  
Long Time ◽  
Sensor Temperature

High-performance concrete (HPC) as a promising construction material has been widely used in infrastructures and high-rise buildings etc. However, its pretty high autogenous shrinkage (AS) especially in its early age becomes one of the key problems endangering long-time durability of HPC structures. This paper carried out the early age AS research of large scaled HPC column specimens by embedded Fiber Bragg-Grating (FBG) strain sensor. Temperature compensation for FBG strain sensor by thermocouple was also attempted in this paper, and the results were reasonable and acceptable comparing with the result compensated by FBG temperature sensor. Reinforcement influence, size effect and temperature effect on HPC AS were also analyzed respectively in this paper.

scholarly journals Ideal supplementary cementing material – Metakaolin: A review

2020 ◽  
Vol 11 (1) ◽  
pp. 58-65
Author(s):  
G. Lizia Thankam ◽  
Neelakantan Thurvas Renganathan
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Mineral Admixture ◽  
Homogeneous Material ◽  
Interfacial Zone ◽  
Supplementary Cementing Materials ◽  
Pozzolanic Material ◽  
Efficient Packing ◽  
Cementing Material ◽  
Zone Microstructure

AbstractThough being an ancient trend, usage of the homogeneous material cement in the construction industry is steadily getting eradicated with the springing up of supplementary cementing materials (SCM). Metakaolin is an imminent mineral admixture extracted from the mineral ore kaolinite, which enhances the interfacial zone by more efficient packing at the cement paste-aggregate particle interface, thus reducing the bleeding and producing a denser, more homogeneous transition zone microstructure. This paper depicts the various repercussions of the pozzolanic material metakaolin in the fresh and hardened properties of concrete when replaced with cement in finite amount. Also, it states the behavior of high-performance concrete and self-compacting concrete with metakaolin.

Sign in / Sign up

Export Citation Format

Share Document