scholarly journals Influence of Local Sand on the Physicomechanical Comportment and Durability of High Performance Concrete

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Nadia Tebbal ◽  
Zine El Abidine Rahmouni
Keyword(s):  
Experimental Study ◽  
High Performance ◽  
Sand Dune ◽  
High Performance Concrete ◽  
Specification Tests ◽  
Mechanical Strengths ◽  
Better Than

This research consists of incorporating the crushed sand (CS) in the composition of a concrete and studies the effect of its gradual replacement by the sand dune (SD) on sustainability of high performance concrete (HPC) in aggressive environments. The experimental study shows that the parameters of workability of HPC are improved when the CS is partially replaced by the SD (<2/3). However, a high content of SD (>1/3) additional quantities of water is needed to meet the workability properties. The mechanical strengths decrease by adding the SD to CS, but they reach acceptable values with CS in moderate dosages. The HPC performances are significantly better than the control concrete made up with the same aggregates. The specification tests of durability show that the water absorbing coefficients by capillarity increase after adding SD to the CS.

Experimental Study on Permeability and Chloride Resistance Properties of Concrete in Yu-Cheng Bridge

2012 ◽  
Vol 204-208 ◽  
pp. 2253-2256
Author(s):  
Tao Fan ◽  
Jian Feng Dong ◽  
Yu Xi Zhao
Keyword(s):  
Experimental Study ◽  
Water Absorption ◽  
High Performance ◽  
High Performance Concrete ◽  
Salt Spray ◽  
Air Permeability ◽  
Normal Concrete ◽  
Chloride Resistance ◽  
The Relationship ◽  
Better Than

This paper studies air permeability, water absorption and chloride resistance properties of the normal concrete (NC) and the high performance concrete (HPC) adopted in the Yu-Cheng Bridge, Zhejiang Province. The air permeability and water absorption were measured by Autoclam, while the chloride resistance were tested by RCT after accelerate chloride ingression in the salt spray cabinet. The relationship among the air permeability, the water absorption and the chloride resistance of both kinds of concrete were analyzed. According to the result of Autoclam, HPC shows better resistance abilities of air permeability and water absorption, and this indicates that HPC is denser than NC. RCT shows that the chloride resistance of HPC is better than that of normal concrete.

EXPERIMENTAL STUDY ON DURABILITY OF ROOM TEMPERATURE CURING UFC MORTAR

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Haruka Murakami ◽  
Hiromi Fujiwara ◽  
Masanori Maruoka ◽  
Takahumi Watanabe ◽  
Koji Satori
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
High Performance ◽  
Room Temperature ◽  
Bending Strength ◽  
High Performance Concrete ◽  
Drying Shrinkage ◽  
Concrete Repair ◽  
Repair Materials ◽  
Low Salt

In recent years, as structures become higher, larger, and more durable concrete whose compressive strength of the concrete is 150 N/mm 2 or more have been put to practical use. It is for this reason that it is necessary to develop strengthening materials with equal or better performance. Furthermore, the development of high-performance concrete repair materials is carried out because demand to seismic strengthening and repair increases. In this study, considering these circumstances, it was conducted an experimental study with the aim of developing a repair material using room temperature curing UFC (R-UFC). A binder composition preparation of the R-UFC has excellent fluidity under pressure. It was achieved that high-grade thixotropy, high compressive strength, and high bending strength. It can also be sprayed continuously because of its high thixtoropy. It was confirmed that the sprayed thickness was reached to 20mm by one work. Durability of this R-UFC was investigated and it was confirmed the high sulfate resistance, small drying shrinkage and low salt permeability.

scholarly journals The Compressive Strength of High-Performance Concrete and Ultrahigh-Performance

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
E. H. Kadri ◽  
S. Aggoun ◽  
S. Kenai ◽  
A. Kaci
Keyword(s):  
Experimental Data ◽  
Compressive Strength ◽  
Silica Fume ◽  
High Performance ◽  
High Performance Concrete ◽  
Cementitious Materials ◽  
Strength Gain ◽  
Proposed Model ◽  
Partial Cement Replacement ◽  
Better Than

The compressive strength of silica fume concretes was investigated at low water-cementitious materials ratios with a naphthalene sulphonate superplasticizer. The results show that partial cement replacement up to 20% produce, higher compressive strengths than control concretes, nevertheless the strength gain is less than 15%. In this paper we propose a model to evaluate the compressive strength of silica fume concrete at any time. The model is related to the water-cementitious materials and silica-cement ratios. Taking into account the author's and other researchers’ experimental data, the accuracy of the proposed model is better than 5%.

In-Service Performance of High-Performance Concrete Bridge Decks

2000 ◽  
Vol 1696 (1) ◽  
pp. 193-196 ◽  
Author(s):  
Sreenivas Alampalli ◽  
Frank Owens
Keyword(s):  
New York ◽  
High Performance ◽  
Recent Literature ◽  
High Performance Concrete ◽  
Bridge Decks ◽  
New York State ◽  
Crack Density ◽  
Transverse Cracking ◽  
Concrete Bridge Decks ◽  
Better Than

The current statewide standard for New York State bridge decks is Class HP (high-performance) concrete. This mix was introduced in April 1996 to increase deck durability by reducing cracking and permeability. Since its introduction, more than 80 bridge decks have been built with Class HP concrete. To compare the performance of Class HP concrete with that of previously specified concrete, the decks were visually inspected. Results indicated that Class HP decks performed better than previously specified concrete in resisting both longitudinal and transverse cracking. Furthermore, of the 84 decks inspected, 49 percent exhibited no cracking at all, but of those that had cracked, 88 percent exhibited equal or less longitudinal cracking and 80 percent exhibited equal or less transverse cracking than previously specified concrete. A final result showed that average transverse crack density on Class HP decks, excluding uncracked decks, was 6.9 cm/m2. This value is comparable with crack densities for other decks (not using HP mix) that were reported in recent literature.

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