The Durability and Damage Testing of High Performance Concrete

2013 ◽  
Vol 591 ◽  
pp. 325-328
Author(s):  
Wei Hong Li ◽  
Ying Ying Xu
Keyword(s):  
Concrete Structure ◽  
High Performance ◽  
High Performance Concrete ◽  
Concrete Structures ◽  
Construction Engineering ◽  
Engineering Structure ◽  
Main Research ◽  
Testing Technology ◽  
Concrete Damage ◽  
Durability Of Concrete

Concrete structures are widely used in engineering structure, but because of the problem of environment and material, the durability of the concrete structure appears. This paper first states the main research content of the durability of concrete structures, then introduces the main ways to improve the durability of concrete structure. Finally it summarizes several kinds of concrete damage testing technology and characteristics, and the construction engineering testing technology is prospected.

Temperature Control and Anti-Cracking Measures for a High-Performance Concrete Aqueduct

2013 ◽  
Vol 405-408 ◽  
pp. 2739-2742 ◽  
Author(s):  
Zhen Hong Wang ◽  
Shu Ping Yu ◽  
Yi Liu
Keyword(s):  
Temperature Control ◽  
Temperature Difference ◽  
High Performance ◽  
High Performance Concrete ◽  
Concrete Structures ◽  
Apparent Temperature ◽  
Mass Concrete ◽  
Water Pipe ◽  
Thin Walled ◽  
Water Pipe Cooling

To solve the problem of cracks developing on thin-walled concrete structures during construction, the authors expound on the causes of cracks and the crack mechanism. The difference between external and internal temperatures, basic temperature difference and constraints are the main reasons of crack development on thin-walled concrete structures. Measures such as optimizing concrete mixing ratio, improving construction technology, and reducing temperature difference can prevent thin-walled concrete structures from cracking. Moreover, water-pipe cooling technology commonly used in mass concrete can be applied to thin-walled concrete structures to reduce temperature difference. This method is undoubtedly a breakthrough in anti-cracking technology for thin-walled concrete structures, particularly for thin-walled high-performance concrete structures. In addition, a three-dimensional finite element method is adopted to simulate the calculation of temperature control and anti-cracking effects f. Results show the apparent temperature controlling effect of water-pipe cooling for thin-walled concrete structures.

Experimental Research on High Performance Concrete under Drying-Wetting Cycles in Saline-Lake Environment

2011 ◽  
Vol 368-373 ◽  
pp. 1561-1565
Author(s):  
Wei Kong ◽  
Yi Hong Wang ◽  
Gang Zhou ◽  
Tian Hua Li
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Saline Lake ◽  
Salt Lake ◽  
Concrete Structures ◽  
Lake Area ◽  
Corrosion Performance ◽  
Dual Action ◽  
Corrosion Problem ◽  
Single Factor Experiment

Aiming at the corrosion problem of concrete structure of bridges in Chaerhan salt lake area, the paper puts forward a new method of using multi-defense lines against salt erosion, helpful to improve the durability of concrete structures. Single factor experiment of salt erosion and a dual-action experiment of salt erosion and drying-wetting cycles were conducted, using 3 kinds of concrete specimens, including simple high performance concrete (HPC), HPC coated with waterproof material outside and HPC mixed with waterproof material. Results of experiments show that high performance concrete prepared in the experiments has good anti-corrosion performance. Moreover, HPC with multi-defense lines application effectively delays salt erosion to concrete, and lengthens service life of concrete structures in saline-lake environment.

scholarly journals Effect of added the polycarboxylate ether on slump retention and compressive strength of the high-performance concrete

2018 ◽  
Vol 195 ◽  
pp. 01020 ◽  
Author(s):  
Jonbi Jonbi ◽  
Resti Nur Arini ◽  
Basori Anwar ◽  
Mohamad Ali Fulazzaky
Keyword(s):  
Compressive Strength ◽  
High Performance ◽  
Civil Engineering ◽  
High Performance Concrete ◽  
Concrete Mixture ◽  
Concrete Sample ◽  
Strength Tests ◽  
Polycarboxylate Ether ◽  
Insight Into ◽  
Durability Of Concrete

It is well known that workability of high performance concrete (HPC) is dependent on slump value of concrete mixture. Moreover, slump retention is the most sensitive compared to a well-known slump value because it represents the durability of concrete mixture for its applications in the field of civil engineering. This research used the polycarboxylate ether (PCE) to increase slump value of concrete mixture and then verified the effect of PCE on the slump retention and compressive strength of different high-performance concretes. 0%, 0.5%, 1%, 2% of PCE were added into concrete mixture to yield a minimum compressive strength of f’c 50 MPa. The slump retention tests were performed at 0, 15, 30, 45, 60 and 75 minutes while the compressive strength tests were carried out at 3, 7, 14 and 28 days for every concrete sample. The result findings showed that the optimal concrete performance can be achieved by adding 2% of PCE to reach at a slump retention value of 45 minutes and a compressive strength of 53.84 MPa. Effect of PCE on the slump retention and compressive strength has been verified to contribute an insight into the application of a proper designed workability of HPC.

Durability of Concrete Structure Research and Development Direction

2010 ◽  
Vol 44-47 ◽  
pp. 2346-2353
Author(s):  
Lei Jiang ◽  
Ji Tao Yao ◽  
Ren Xin ◽  
Wei Li
Keyword(s):  
Research And Development ◽  
Concrete Structure ◽  
International Research ◽  
Concrete Structures ◽  
Future Research ◽  
Development Direction ◽  
The World ◽  
Four Levels ◽  
Structure Research ◽  
Durability Of Concrete

Currently, durability of concrete structures is a hot area of civil engineering. This paper reviews the background to the study of concrete and the current international research developments. Recent accomplishments in the world are summarized on four levels—environment, materials, components, structure. Finally, directions of future research are also proposed.

Material and Structural Properties for Creating High Performance Concrete Structures

2014 ◽  
Vol 629-630 ◽  
pp. 21-27
Author(s):  
György L. Balázs
Keyword(s):  
Structural Properties ◽  
Material Properties ◽  
High Performance ◽  
High Performance Concrete ◽  
Concrete Structures ◽  
Structural Elements ◽  
Design Rules ◽  
Existing Structures ◽  
New Codes ◽  
Specific Material

HPC and UHPC concretes are finding their ways both to new structures and to retrofitting of existing structures. Herein specific material properties as well as structural examples are discussed. New Codes and Recommendations provide description of material properties and design rules for HPC/UHPC structures and structural elements.

Durability in Cold Area of Prefabricated Concrete Structures

2014 ◽  
Vol 638-640 ◽  
pp. 1317-1321
Author(s):  
Ya Bo Wang ◽  
Lei Qian ◽  
Gao Feng Dou ◽  
Chuan Hao Xi ◽  
Han Ting Liu
Keyword(s):  
Failure Mechanism ◽  
Influencing Factors ◽  
Concrete Structure ◽  
Concrete Structures ◽  
Cold Regions ◽  
Factors Affecting ◽  
Cold Area ◽  
Durability Of Concrete

The factors affecting durability of concrete structures is described in This paper .It is pointed out here that is the concept of durability in prefabricated concrete structure , the influencing factors and failure mechanism in cold regions. It is proposed which are the methods and corresponding measures to enhance the durability of concrete structures.

Applying Research on Testing Compressive Strength of High Performance Concrete with Rebound Method

2012 ◽  
Vol 452-453 ◽  
pp. 106-109
Author(s):  
Zheng Jun Wang ◽  
Felix Zhao
Keyword(s):  
Compressive Strength ◽  
Concrete Structure ◽  
High Performance ◽  
High Performance Concrete ◽  
Cement Concrete ◽  
Construction Quality ◽  
Concrete Construction ◽  
Estimation Models

In order to grasp timely and accurately quality of high performance concrete, detection of compressive strength of high performance concrete can be non-destructively, rapidly and accurately tested that is very testing index. The paper did some research on compressive strength of high performance concrete applying redound method that it established several estimation models between rebound value and compressive strength. Experiment shows that rebound method can effetely test compressive strength of high performance concrete. Construction quality of Cement concrete structure can timely grasp applying the method.

Usage of Heat Pretreatment for Reduction of Explosive Spalling of High Performance Concrete

2014 ◽  
Vol 1054 ◽  
pp. 37-42
Author(s):  
Iveta Nováková ◽  
Ulrich Diederichs ◽  
Lenka Bodnárová
Keyword(s):  
Compressive Strength ◽  
Water Vapour ◽  
High Performance ◽  
High Performance Concrete ◽  
Mercury Porosimetry ◽  
Concrete Structures ◽  
Explosive Spalling ◽  
Polypropylene Fibres ◽  
Rapid Reduction ◽  
Micro Cracks

Fire resistance of concrete structures could be improved by add of polypropylene fibres in to the concrete mixture in butch from 1 to 2 kg per 1 m3 of fresh concrete. This method is effective, but it is not possible to use it for existing concrete and existing reinforced concrete structures. The new method which has good potential for fire protection of existing structures is based on creation of capillary pore and micro cracks system, which allowed water vapour evaporate from concrete. This study deals with determination of appropriate temperature in which is created adequate network of capillary pores and micro cracks which has no influence on strength and durability of the concrete. The formation of macro cracks and bigger pores could cause rapid reduction of compressive and tensile strength, decrease of resistance to aggressive substances and decrease of the frost resistance. The high performance concrete (HPC) has very low porosity, which can cause explosive spalling while the water vapour tries to evaporate from concrete structure during the fire. The HPC concrete has high compressive strength and high density. The HPC samples were exposed to temperatures 150, 250, 350 a 450°C, and after cooling down to normal ambient were carried out tests to define changes in porosity by mercury porosimetry, mass looses and compressive strength changes. The heated HPC concrete is regaining humidity into its structure from surrounding atmosphere, which can cause rehydratation of some chemical compounds. [1] For verification of these hypotheses the HPC samples were kept in water storage for 4 weeks and then tested.

scholarly journals Advanced high-performance concrete structures - challenge for sustainable and resilient future

2018 ◽  
Vol 195 ◽  
pp. 01001
Author(s):  
Petr Hajek
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Concrete Structures ◽  
Potential Contribution ◽  
Basic Principles ◽  
Model Code ◽  
Existing Structures ◽  
Impact Reduction ◽  
Development Goals ◽  
Technical Solutions

Development and recent changes in natural and socio-economic environment requires new technical solutions for construction of new and reconstruction and modernization of existing structures. Structures and all built environment should be better prepared for new conditions - they should be sustainable and resilient. Concrete is building material with high potential for new technical solutions resulting in needed environmental impact reduction and consequent social and economic improvements. The paper presents potential contribution of concrete industry, advanced highperformance concrete and concrete structures to Sustainability Development Goals specified in UN 2030 Agenda for Sustainable Development and presents basic principles of implementation of sustainability approach into design of concrete structures and particularly to fib Model Code 2020.

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