Field measurements for early-age strains in concrete walls

1990 ◽  
Vol 42 (153) ◽  
pp. 203-212 ◽  
Author(s):  
M. Anson ◽  
P. M. Rowilson
Keyword(s):  
Field Measurements ◽  
Early Age ◽  
Concrete Walls

Nonstationary Thermodynamic Analysis of a Chosen Critical Detail in a Waterproof Concrete Basement Structure Using an Experimentally Verified Model

2017 ◽  
Vol 738 ◽  
pp. 47-57
Author(s):  
Miroslav Ignacak ◽  
Lydia Matiaskova ◽  
Július Šoltész
Keyword(s):  
Assessment Tool ◽  
Parallel Evolution ◽  
Field Measurements ◽  
Basement Structure ◽  
Concrete Walls ◽  
Concrete Members ◽  
Performance Requirements ◽  
Reliable Design ◽  
Using Data ◽  
Transient Thermal

When concrete structures with specific performance requirements call for cracking to be avoided, a reliable crack assessment of hardening concrete members is a crucial task for the design. Concrete walls cast onto already hardened foundation slabs represent an example of externally restrained members commonly subjected to strains resulting from early-age movements. As a consequence, unacceptable cracks may develop. The key parameter for a reliable design of such members is a correct assessment of the hardening phase with respect to the deformation behavior followed with parallel evolution of stiffness and strength properties.This contribution aims to present a macroscopic numerical thermodynamic model which can be used for solving the transient thermal field of a chosen structural detail subjected to thermal loads during early ages. In connection with stress development control, the model represents a mechanical based crack assessment tool for hardening concrete members. Its applicability is discussed at a model solution of a wall-to-slab connection detail in a waterproof concrete basement structure. The model outcome values are verified using data from experimental field measurements.

Analysis of Sound Insulation Performance of Reinforce Concrete Walls between Households According to Wall Thickness Criteria in Apartments

2017 ◽  
Vol 873 ◽  
pp. 237-242
Author(s):  
Hye Kyung Shin ◽  
Kyoung Woo Kim ◽  
A Yeong Jeong ◽  
Kwan Seop Yang
Keyword(s):  
Reinforced Concrete ◽  
Wall Thickness ◽  
Field Measurements ◽  
Reinforce Concrete ◽  
Sound Insulation ◽  
Concrete Wall ◽  
Minimum Thickness ◽  
Concrete Walls ◽  
Reinforced Concrete Wall ◽  
Insulation Performance

Sound insulation between households is properly ensured to provide a quiet residential environment in apartments. The legal requirements for sound insulation in apartments in Korea are set to meet the wall’s minimum thickness or sound insulation performance. When construction companies choose the walls that satisfy thethickness in the standards of boundary walls between households, it is difficult to know the sound insulation performance. In this study, the sound insulation performance of reinforced concrete walls is predicted according to the wall thickness criteria and analyzed through field measurements. In newly built apartments, the reinforced concrete wall’s sound insulation performance(R'w) is 56 – 66 dB, which is a similar level of the international criterion. And the sound insulation performance of the reinforced concrete wall according to thickness standards is similar to sound insulation performance standardsof Korea.

Reduction of Early-Age Crack Risks in Concrete Walls by Using a New Casting Technique

2016 ◽  
Vol 26 (3) ◽  
pp. 216-224
Author(s):  
Majid Al-Gburi ◽  
Jan-Erik Jonasson ◽  
Martin Nilsson
Keyword(s):  
Early Age ◽  
Concrete Walls ◽  
Casting Technique

Evaluation of methods for analyzing early-age cracking risk in concrete walls of tunnel structures

2020 ◽  
Vol 71 (7) ◽  
pp. 746-759
Author(s):  
Do Tu Anh ◽  
Ha Luan Minh ◽  
Nguyen Quang Thac ◽  
Tran Tam Duc ◽  
Tham Thang Quoc
Keyword(s):  
Reinforced Concrete ◽  
Early Age ◽  
Current Standard ◽  
Tunnel Wall ◽  
Concrete Walls ◽  
Reinforced Concrete Walls ◽  
Modern Methods ◽  
Cracking Risk ◽  
Crack Widths ◽  
Evaluation Of Methods

This paper is concentrated on investigating the modern methods to evaluate the probability of cracking in urban tunnel structures during construction. The study considers the current standard methods for assessing reinforced concrete walls of an urban tunnel, which experienced early-age cracking. The results obtained using guidelines were compared with actual observations of crack widths in the urban tunnel wall. Examples of using specifications in wall design were also described. The proper method is highlighted with suggestions for a possible path for considering early-age thermal and shrinkage effects in urban reinforced concrete tunnel walls

Sign in / Sign up

Export Citation Format

Share Document