Permeability Measurement of High Performance Concrete at Elevated Temperature Employing a New Test Set-Up

2015 ◽  
Vol 1124 ◽  
pp. 288-293
Author(s):  
Michaela Fiedlerová ◽  
Johannes Kirnbauer ◽  
Heinrich Bruckner
Keyword(s):  
Elevated Temperature ◽  
High Performance ◽  
Building Materials ◽  
High Performance Concrete ◽  
Gas Permeability ◽  
Permeability Measurement ◽  
Test Set ◽  
Testing Procedures ◽  
Heating And Cooling ◽  
Set Up

This paper is focused on clarifying behaviour of concrete at elevated temperature with employing new test set-up constructed at Institute of Building Construction and Technology, Vienna University of Technology. This unique test set-up allows measuring gas permeability of different building materials such as concrete or ceramic at both high temperature (up to 400°C) and pressure (up to 6 bars). Present paper illustrates a new set up for permeability measurement during the heating and cooling and different testing procedures and evaluation of their influence on results.

A large-scale test set-up for measuring VOC emissions from wood products under laboratory conditions in simulated real rooms

Holzforschung ◽  
2015 ◽  
Vol 69 (4) ◽  
pp. 457-462 ◽  
Author(s):  
Eva Höllbacher ◽  
Cornelia Rieder-Gradinger ◽  
Daniel Strateva ◽  
Ewald Srebotnik
Keyword(s):  
Large Scale ◽  
Building Materials ◽  
Wood Products ◽  
Test Set ◽  
Voc Emissions ◽  
Laboratory Conditions ◽  
Volatile Organic ◽  
Scale Test ◽  
Set Up ◽  
Realistic Data

Abstract A large-scale test set-up was designed to evaluate the volatile organic compound (VOC) emissions of building materials in a real room situation but under laboratory conditions. Two model rooms (ModR) with a volume of 30 m3 each were constructed of the wood-based building materials X-lam and OSB, respectively. Temperature and relative humidity (RH) inside the ModR were kept in a range of 21°C–25°C and 45%–55% RH. VOCs were collected at 13 different times over a period of 23 weeks, and the total VOC (TVOC) concentration was calculated from GC/MS data. Results were quantified as toluene equivalents (TE). In the X-lam-ModR, the TVOC concentration decreased by 64% over the whole measurement period from 115 to 41 μg m-3 TE. Terpenes were the most abundant substance group and accounted, on average, for 80% of the TVOC concentration. In the OSB-ModR, the TVOC concentration decreased by 72% from 443 to 124 μg m-3 TE. Aldehydes showed the highest concentrations, accounting, on average, for 52% of the TVOC, while 38% were terpenes. The results show that this type of test provides realistic data for the praxis.

Age-Adjusted Effective Modulus Method for Creep of High-Performance Concrete

2006 ◽  
Vol 302-303 ◽  
pp. 693-699
Author(s):  
Bing Han ◽  
Yuan Feng Wang
Keyword(s):  
Experimental Data ◽  
Plastic Flow ◽  
High Performance ◽  
High Performance Concrete ◽  
Effective Modulus ◽  
Relaxation Coefficient ◽  
Modulus Method ◽  
Set Up

This paper discusses the suitability of using several creep theories of common concrete for creep of high-performance concrete (HPC). Based on the Age-Adjusted Effective Modulus method (AEMM) for creep of concrete, Improved Dischinger (ID) method and the Elastic Continuation and Plastic Flow (ECPF) theory for calculating relaxation coefficient and considering characteristics of HPC, a method is set up for calculating the creep of HPC under changing stresses, and comparing results gotten by the method with some experimental data, it can be considered that the above methods are suit for the calculation of creep of HPC.

Studies on forecasting of carbonation depth of slag high performance concrete considering gas permeability

2013 ◽  
Vol 79 ◽  
pp. 36-40 ◽  
Author(s):  
Xiantang Zhang ◽  
Xiaochen Zhou ◽  
Hongmin Zhou ◽  
Kangning Gao ◽  
Zhaodong Wang
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Gas Permeability ◽  
Carbonation Depth

Behavior of High Performance Concrete Under High Temperature (60-450°C) for Surface Long-Term Storage: Thermo-Hydro-Mechanical Residual Properties

2000 ◽  
Vol 663 ◽  
Author(s):  
C. Gallé ◽  
J. Sercombe ◽  
M. Pin ◽  
G. Arcier ◽  
P. Bouniol
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
High Performance ◽  
High Performance Concrete ◽  
Gas Permeability ◽  
Long Term Storage ◽  
Residual Properties ◽  
Term Storage

ABSTRACTAfter various thermal treatments (up to 450°C), residual thermo-hydro-mechanical (T-H-M) properties of two OPC high performance concretes (HPC) were analyzed in the context of surface long-term storage. Materials were prepared with silico-calcareous aggregates (standard HPC) and hematite aggregates (heavy HPC). The initial microstructural (porosity ≈10%) and transport (gas permeability ≈10-19 m2) properties are similar for both concretes. As far as the mechanical aspect is concerned, heavy HPC shows a higher compressive strength and elastic modulus than standard HPC (78 and 63 MPa, 81 and 49 GPa, respectively). Heavy HPC is also characterized by a higher thermal conductivity (7.3 W m-1 K-1 compared to 2.7 W m-1 K-1 for standard concrete). Results analysis show that thermo-hydro-mechanical damages are smaller for heavy HPC. Between 60 and 250°C, the elastic modulus and the compressive strength of standard HPC decrease by 40% and 16%, respectively. For heavy HPC, these parameters respectively decrease by 10% and 4%. A similar trend was observed for thermal conductivity evolution. Gas permeability and porosity data confirm the good behavior of heavy HPC. As a conclusion, hematite HPC seems to provide more interesting T-H-M residual properties than standard HPC. Limited thermal expansion and thermal gradients induced by hematite are probably responsible of this behavior.

scholarly journals Error Assessment in Permeability Measurement Using Radial Flow Method

2009 ◽  
Vol 18 (4) ◽  
pp. 096369350901800 ◽  
Author(s):  
Frank Gommer ◽  
Stepan Lomov ◽  
Kelly Vandenbosche ◽  
Ignace Verpoest
Keyword(s):  
Measurement Errors ◽  
Radial Flow ◽  
Error Assessment ◽  
Permeability Measurement ◽  
Test Set ◽  
Flow Method ◽  
Set Up

Permeability values measured on textile reinforcements with different methods or different test set-ups can differ significantly from each other. Even measurements preformed on the same test set-up can have a substantial scatter of measured permeability values. This paper discusses the sources of possible measurement errors for a radial flow set-up and their influence on the measured permeability results. Suggestions are given to improve the reliability of permeability measurements.

Identification of Unknown Sediment in Water-Reducer

2014 ◽  
Vol 852 ◽  
pp. 27-31
Author(s):  
Sun Yi Si ◽  
Bing Hui Chen ◽  
Wen Zhang ◽  
Jia Wei Qian ◽  
Guo Qing Ding
Keyword(s):  
Water Consumption ◽  
Urban Population ◽  
High Performance ◽  
Large Scale ◽  
Building Materials ◽  
High Performance Concrete ◽  
Urbanization Level ◽  
Chemical Admixtures ◽  
Concrete Materials

As urbanization level of our country improves constantly, urban population will increase dramatically. Then industrial and civil buildings and other facilities will be multiplied, which leads to use plenty of high-performance concrete materials. i.e. China's building materials, especially the use of concrete will be increased year by year[. And the chemical admixtures is an essential fifth component of concrete[2-. It has been nearly 50 years since the chemical admixtures were researched,expolited and used in large scale[.But the water reducer are used most widely, its characteristics is to reduce the water consumption of concrete, and minimize the porosity of concrete. Thereby which enhances its intensity and durability.

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