Experimental Study of Green High Performance Concrete Strength Testing by Rebound Method

2011 ◽  
Vol 71-78 ◽  
pp. 737-743
Author(s):  
Xu Wen Kong ◽  
Long Cui ◽  
Jin Shan Wang
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Concrete Strength ◽  
Strength Testing ◽  
Carbonation Depth ◽  
Concrete Carbonation ◽  
Plastic Concrete ◽  
Testing Accuracy ◽  
Method Analysis ◽  
Experiment Analysis

Compare experiment analysis effect of material, slump, carbonation depth on green high performance concrete strength by rebound method, analysis under questions based on microstructure: (1)Basic reason for additives and admixtures etc. impact rebound testing; (2) Significant differences of pumping concrete and plastic concrete; (3) Concrete carbonation depth impact rebound value. Provide the method for improving testing accuracy of green high performance concrete strength testing by rebound method.

Study on Carbonation Resistance of High-Performance Concrete with Large Amount of Fly Ash

2012 ◽  
Vol 476-478 ◽  
pp. 1688-1691 ◽  
Author(s):  
Xue Song Zhang
Keyword(s):  
Fly Ash ◽  
High Performance ◽  
High Performance Concrete ◽  
Strength Development ◽  
Carbonation Depth ◽  
Concrete Carbonation ◽  
Carbonation Resistance ◽  
Development Characteristic ◽  
Compressive Strength Development

Based on the mechanism of concrete carbonation, the effects of content of fly ash in the binder, the water to binder ratios, compound activator, and long-term curing on the carbonation depth of fly ash high-performance concrete are investigated. Experiment results are analyzed and compared with compressive strength development characteristic of fly ash high-performance concrete, and some valuable conclusions are gained.

Anti-Permeability and Resistance Carbonization Test Study High Performance Concrete with High Content of Fly Ash

2013 ◽  
Vol 357-360 ◽  
pp. 1106-1109
Author(s):  
Xiao Yan Guo ◽  
Run Xia Hao
Keyword(s):  
Fly Ash ◽  
High Performance ◽  
Performance Test ◽  
High Performance Concrete ◽  
High Volume ◽  
High Quality ◽  
Carbonation Depth ◽  
Concrete Carbonation ◽  
Test Study ◽  
High Volume Fly Ash

Anti-penetrability performance test and carbonization test of high performance concrete with high volume fly ash were done and were compared with normal concrete. Test illustrated that filled the concrete dense function of high quality fly ash were superior to common concrete. Average carbonation depth of high quality fly ash concrete was slight inferior to carbonation depth of the common concrete. Keywords: anti-penetrability performance; fly ash; high performance concrete; carbonation

scholarly journals Influence of Rapid Heat Treatment on the Shrinkage and Strength of High-Performance Concrete

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4102
Author(s):  
Jan Stindt ◽  
Patrick Forman ◽  
Peter Mark
Keyword(s):  
Heat Treatment ◽  
High Performance ◽  
High Performance Concrete ◽  
Treatment Time ◽  
Precast Concrete ◽  
Concrete Strength ◽  
Shrinkage Strain ◽  
Temperature Treatment ◽  
Production Flow ◽  
Steel Fibres

Resource-efficient precast concrete elements can be produced using high-performance concrete (HPC). A heat treatment accelerates hardening and thus enables early stripping. To minimise damages to the concrete structure, treatment time and temperature are regulated. This leads to temperature treatment times of more than 24 h, what seems too long for quick serial production (flow production) of HPC. To overcome this shortcoming and to accelerate production speed, the heat treatment is started here immediately after concreting. This in turn influences the shrinkage behaviour and the concrete strength. Therefore, shrinkage is investigated on prisms made from HPC with and without steel fibres, as well as on short beams with reinforcement ratios of 1.8% and 3.1%. Furthermore, the flexural and compressive strengths of the prisms are measured directly after heating and later on after 28 d. The specimens are heat-treated between 1 and 24 h at 80 °C and a relative humidity of 60%. Specimens without heating serve for reference. The results show that the shrinkage strain is pronouncedly reduced with increasing temperature duration and rebar ratio. Moreover, the compressive and flexural strength decrease with decreasing temperature duration, whereby the loss of strength can be compensated by adding steel fibres.

Study on corrosion effect of high-performance concrete under the action of sulfate and chlorine

2019 ◽  
Vol 33 (01n03) ◽  
pp. 1940054 ◽  
Author(s):  
Rongrong Yin ◽  
Jie Hu ◽  
Yu Liu ◽  
Qing Wu ◽  
Chenchen Zhang ◽  
...  
Keyword(s):  
Compressive Strength ◽  
High Performance ◽  
Growth Stage ◽  
High Performance Concrete ◽  
Slow Growth ◽  
Concrete Strength ◽  
Corrosion Damage ◽  
Chloride Salt ◽  
Single Action ◽  
Two Stages

The thickness of corroded concrete layer and the compressive strength of prisms under the action of sulfate and chloride salt were investigated by ultrasonic test and compression test, respectively. The results show that under the single action of sulfate, the strength of concrete experienced two stages: a slow growth stage and a rapid descent stage. Correspondingly, under the combined action of sulfate and chloride, the concrete strength experienced another two stages: a slow growth stage and a slow degradation stage. The existence of chloride inhibited the corrosion damage of concrete in a certain extent. It was found that higher concentration of chlorine salt would lead to a stronger inhibition effect. A good consistency was observed among corrosion layer thickness, compressive strength and X-ray diffraction results. The inhabitation of chloride to the sulfate corrosion of concrete was proved.

scholarly journals Tests of Residual Shear Transfer Strength of Concrete Exposed to Fire

2018 ◽  
Vol 64 (2) ◽  
pp. 187-199
Author(s):  
Muhaned A. Shallal ◽  
Aqil Mousa K. Al Musawi
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Concrete Strength ◽  
Real Life ◽  
Shear Plane ◽  
Concrete Cover ◽  
Experimental Program ◽  
Fire Exposure ◽  
Structural Components ◽  
Shear Transfer

AbstractReinforced concrete is one of the most widely used structural components about which much scientific research has been conducted; however, some of its characteristics still require further research. The main focus of this study is the effect of direct fire on the shear transfer strength of concrete. It was investigated under several parameters including concrete strength, number of stirrup legs (the steel area across the shear plane), and fire duration. The experimental program involved the testing of two sets (groups) of specimens (12 specimens each) with different concrete strengths. Each set contained specimens of two or four stirrup legs exposed to direct fire from one side (the fire was in an open area to simulate a real-life event) for a duration of one, two, and three hours. The results of the comparison showed the importance of using high-performance concrete (instead of increasing the number of stirrup legs) to resist shear stress for the purpose of safety. A significant reduction in shear strength occurred due to the deterioration of the concrete cover after three hours of direct fire exposure.

Research and Applying Evolution of High Efficient Water-Reducing Agent for High Performance Concrete

2012 ◽  
Vol 610-613 ◽  
pp. 573-576
Author(s):  
Zheng Jun Wang ◽  
Jia Bin Liang
Keyword(s):  
High Performance ◽  
Lightweight Concrete ◽  
High Performance Concrete ◽  
Concrete Strength ◽  
High Strength ◽  
Reducing Agent ◽  
Mass Concrete ◽  
Green Concrete ◽  
High Efficient ◽  
Strength And Durability

This paper discusses the development of water-reducing agent and the present situation of the application of high performance concrete. The traditional concrete will be substituted by high performance concrete, green concrete. In the course of appearance of high performance and green, concrete admixtures plays an extremely important role. Concrete water-reducing agent is admixture of the main part. In the case of keeping liquidity, it can make water consumption reduce, so the concrete strength and durability can be improved. It is applicable to all kinds of industrial and civil construction engineering, and it can be applied to different strength grade of concrete. It has important significance for mass concrete engineering, marine building facilities, and component and product of high strength lightweight concrete.

scholarly journals Experimental Evaluation of Nano Silica Effects to High Performance Concrete Strength in Early Age

2020 ◽  
Vol 869 ◽  
pp. 032011
Author(s):  
Van-Thuc Ngo ◽  
Tien-Thanh Bui ◽  
Thanh-Quang-Khai Lam ◽  
Thi-Thu-Nga Nguyen ◽  
Van-Hau Nguyen
Keyword(s):  
Experimental Evaluation ◽  
High Performance ◽  
High Performance Concrete ◽  
Concrete Strength ◽  
Early Age ◽  
Nano Silica

Effect of Nano Materials on Durability of High Performance Concrete

2013 ◽  
Vol 742 ◽  
pp. 220-223 ◽  
Author(s):  
Yu Xi An
Keyword(s):  
Water Permeability ◽  
High Performance ◽  
High Performance Concrete ◽  
Shrinkage Strain ◽  
Nano Materials ◽  
Carbonation Depth ◽  
Shrinkage Cracking ◽  
Carbonation Resistance ◽  
Dry Shrinkage

The aim of this study was to study the effect of nanoSiO2 on durability of high performance concrete. Four different nanoSiO2 contents (1%, 2%, 3% and 4%) were used. The results indicate that the content of nanoSiO2 has great effect on the durability of high performance concrete. With the increase of nanoSiO2 content, both of the length of water permeability and the carbonation depth of concrete are decreasing gradually, and the water impermeability and the carbonation resistance of concrete are increasing gradually. However, with the increase of nanoSiO2 content, there is a tendency of increase on the dry shrinkage strain of 90 days of high performance concrete, and the anti-dry-shrinkage cracking property of concrete is decreasing.

Effects of Fly Ash Particle Sizes on the Compressive Strength and Fracture Toughness of High Performance Concrete

2011 ◽  
Vol 284-286 ◽  
pp. 984-988
Author(s):  
An Shun Cheng ◽  
Yue Lin Huang ◽  
Chung Ho Huang ◽  
Tsong Yen
Keyword(s):  
Fracture Toughness ◽  
Particle Size ◽  
Compressive Strength ◽  
Fly Ash ◽  
High Performance ◽  
High Performance Concrete ◽  
Concrete Strength ◽  
Bending Test ◽  
Strength Development ◽  
Particle Sizes

The study aims to research the effect of the particle size of fly ash on the compressive strength and fracture toughness of high performance concrete (HPC). In all HPC mixtures, the water-to-binder ratio selected is 0.35; the cement replacement ratios includes 0%, 10% and 20%; the particle sizes of fly ash have three types of passing through sieves No. 175, No. 250 and No. 325. Three-point-bending test was adopted to measure the load-deflection relations and the maximum loads to determine the fracture energy (GF) and the critical stress intensity factor (KSIC). Test results show that adding fly ash in HPC apparently enhances the late age strengths of HPC either for replacement ratio of 10% or 20%, in which the concrete with 10% fly ash shows the higher effect. In addition, the smaller the particle size is the better the late age concrete strength will be. The HPC with the finer fly ash can have higher strength development and the values of GF and KSIC due to the facts of better filling effect and pozzolanic reaction. At late age, the GF and KSIC values of concrete with 10% fly ash are all higher than those with 20% fly ash.

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
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