Influence of mix proportions and curing conditions on tensile splitting strength of high strength concretes

1999 ◽  
Vol 32 (7) ◽  
pp. 500-505 ◽  
Author(s):  
K. Kovler ◽  
I. Schamban ◽  
S. Igarashi ◽  
A. Bentur
Keyword(s):  
High Strength ◽  
Curing Conditions ◽  
Splitting Strength ◽  
Tensile Splitting Strength

scholarly journals The Tensile Strength and Damage Characteristic of Two Types of Concrete and Their Interface

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 16 ◽  
Author(s):  
Qingchuan Shen ◽  
Wei Chen ◽  
Chao Liu ◽  
Wenjie Zou ◽  
Liufeng Pan
Keyword(s):  
Fracture Surface ◽  
Crack Initiation ◽  
High Strength Concrete ◽  
Steel Fiber ◽  
High Strength ◽  
Concrete Sample ◽  
Strength Concrete ◽  
Splitting Strength ◽  
Low Strength ◽  
Tensile Splitting Strength

In this study, tensile splitting tests and corresponding numerical simulations are performed on high strength concrete, low strength concrete, the interface between the two types of concrete, and the interface reinforced by steel fiber, respectively. The tensile splitting strength, crack initiation load, and damage characteristics are analyzed based on experiment data and fracture surface of samples. It can be concluded that tensile splitting strength and crack initiation load have the descending order of ‘HT’ (high strength concrete sample) > ‘LT’ (low strength concrete sample) > ‘FT’ (interface reinforced by steel fiber) > ‘OT’ (interface). The tensile splitting strength is related not only to the roughness of the fracture surface, but also to the percentage of fractured aggregates. The steel fiber can increase initiation cracking load, peak load and residual strength of the interface. The existing of interface composited by two types of material can cause asymmetric distribution of the stress state, even if geometry and the load are symmetrical for samples.

Optimization of the Concrete Mix Proportions Centered on Performance after Exposure to High Temperature

2011 ◽  
Vol 268-270 ◽  
pp. 372-376 ◽  
Author(s):  
A. Chaboki-Khiabani ◽  
M. Bastami ◽  
M. Baghbadrani ◽  
M. Kordi
Keyword(s):  
Mechanical Properties ◽  
Elevated Temperature ◽  
Statistical Study ◽  
High Strength ◽  
Taguchi Approach ◽  
Effective Parameters ◽  
Mix Proportion ◽  
Concrete Mix ◽  
Tensile Splitting Strength ◽  
Considerable Loss

This paper presents the results of an experimental and statistical study on the effect of high temperatures on the retained mechanical properties of high-strength concretes (HSC). The mechanical properties of HSC significantly change during and later than exposure to elevated temperature. The compressive and splitting tensile strength of more than 400 HSC cylindrical specimens with sixteen mix proportion have investigated to study the effect of mix proportion on the retained mechanical properties of HSC specimens after heating. According to these results, a considerable loss was observed for all mixes and specimens in strength particularly in tensile splitting strength. In addition, these experimental data were investigated using Taguchi approach to find the effective parameters of mix proportion. Also, the most optimum mix proportion was found and checked experimentally. According to our results, by controlling some factors in the mix proportion, it is possible to reduce the retained destructive effects of elevated temperature on HSC specimens.

Zeolite Influence of Vibropressing Concrete Durability

2017 ◽  
Vol 908 ◽  
pp. 71-75 ◽  
Author(s):  
Giedrius Girskas
Keyword(s):  
Low Temperature ◽  
Aluminum Fluoride ◽  
Concrete Durability ◽  
Test Results ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Absorption Increase ◽  
Splitting Strength ◽  
Tensile Splitting Strength ◽  
Durability Of Concrete

Durability is one of the main characteristics in the production of high-quality concrete paving blocks in the Baltic region climate zone. Concrete paving blocks are produced by means of vi bropressing , dimensions: 198×98×80 mm . The article describes tests with concrete paving blocks, the top layer of which contains 5% of zeolite admixture obtained from waste of aluminum fluoride production by low-temperature synthesis. The durability of concrete paving blocks was tested according to abrasion resistance, tensile splitting strength, absorption and frost resistance. The test results revealed that 5% of zeolite admixture added to the top layer of concrete paving blocks reduce the absorption, increase the tensile splitting strength and decrease abrasion. The zeolite admixture used in concrete paving blocks reduces the scaling about 4 times after 28 freeze-thaw cycles when 3% NaCl is used as the freezing solution. The test results proved that synthetic zeolite obtained from aluminum fluoride by means of low temperature synthesis can be used as a supplementary cementitious material to increase the durability of concrete pavement elements.

STRENGTH OF POROUS CONCRETE PAVEMENT AT DIFFERENT CURING METHODS

2015 ◽  
Vol 76 (14) ◽  
Author(s):  
Mohd Ibrahim Mohd Yusak ◽  
Ramadhansyah Putra Jaya ◽  
Mohd Rosli Hainin ◽  
Che Ros Ismail ◽  
Mohd Haziman Wan Ibrahim
Keyword(s):  
Concrete Strength ◽  
Concrete Pavement ◽  
Experimental Results ◽  
Conventional Concrete ◽  
Curing Conditions ◽  
Porous Concrete ◽  
Curing Methods ◽  
And Performance ◽  
Curing Method ◽  
Tensile Splitting Strength

Porous concrete pavement has been used in some countries as a solution to environmental problems. Contrary to conventional concrete pavement, there is still lack of knowledge in some areas of production and performance of porous concrete pavement. One of the issue concern is curing conditions. These greatly affect the performance of porous concrete pavement. This paper elaborates the experimental results examining the influence of curing method and makes a comparison between five different curing methods on the strength of porous concrete pavement specimens. The properties analyzed include compressive strength, tensile splitting strength and flexural strength. The experimental results indicate that the different curing methods give a different effect to concrete strength. Based on the results obtained in this experiment, curing method by using polyethylene bag promise a good result and better performance to porous concrete pavement specimen strength.

Influences of Glassified Micro-Bubble on Mechanical Properties of Ultra-High-Strength Concrete after Exposure to High Temperature

2014 ◽  
Vol 629-630 ◽  
pp. 259-264
Author(s):  
Gai Fei Peng ◽  
Xiao Li Wang ◽  
Lin Wang
Keyword(s):  
Mechanical Properties ◽  
Experimental Investigation ◽  
High Temperature ◽  
High Strength Concrete ◽  
Room Temperature ◽  
High Strength ◽  
Strength Concrete ◽  
Micro Bubble ◽  
Residual Mechanical Properties ◽  
Tensile Splitting Strength

An experimental investigation was conducted to study residual mechanical properties of Ultra-High-Strength concrete with different dosages of glassified micro-bubble after exposure to high temperature. After exposure to different target temperatures (room temperature, 200 °C, 400 °C, 600 °C,800 °C), residual mechanical properties (residual compressive strength, residual tensile splitting strength, residual fracture energy) of Ultra-High-Strength concrete under different conditions including 1 water-binder ratios (0.18), 3 different contents of glassified micro-bubble (0%, 40%, 60%) were all investigated. The effect of different dosage of glassified micro-bubble was studied on residual mechanical properties of Ultra-High-Strength concrete after exposure to high temperature. The results indicate that the variations of different kinds of Ultra-High-Strength concrete with different dosage of glassified micro-bubble are basically the same. With the increase of temperature, the residual mechanical properties increase at first, then decrease. The residual mechanical properties decrease after exposure to high temperature of 800 °C.

scholarly journals Effect of Curing Temperature Histories on the Compressive Strength Development of High-Strength Concrete

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Keun-Hyeok Yang ◽  
Jae-Sung Mun ◽  
Myung-Sug Cho
Keyword(s):  
Compressive Strength ◽  
High Strength Concrete ◽  
High Strength ◽  
Relative Strength ◽  
Curing Temperature ◽  
Strength Development ◽  
Curing Conditions ◽  
Strength Concrete ◽  
Equivalent Age ◽  
Compressive Strength Development

This study examined the relative strength-maturity relationship of high-strength concrete (HSC) specifically developed for nuclear facility structures while considering the economic efficiency and durability of the concrete. Two types of mixture proportions with water-to-binder ratios of 0.4 and 0.28 were tested under different temperature histories including (1) isothermal curing conditions of 5°C, 20°C, and 40°C and (2) terraced temperature histories of 20°C for an initial age of individual 1, 3, or 7 days and a constant temperature of 5°C for the subsequent ages. On the basis of the test results, the traditional maturity function of an equivalent age was modified to consider the offset maturity and the insignificance of subsequent curing temperature after an age of 3 days on later strength of concrete. To determine the key parameters in the maturity function, the setting behavior, apparent activation energy, and rate constant of the prepared mixtures were also measured. This study reveals that the compressive strength development of HSC cured at the reference temperature for an early age of 3 days is insignificantly affected by the subsequent curing temperature histories. The proposed maturity approach with the modified equivalent age accurately predicts the strength development of HSC.

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