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.

scholarly journals Compressive Strength Development of High-Volume Fly Ash Ultra-High-Performance Concrete under Heat Curing Condition with Time

2020 ◽  
Vol 10 (20) ◽  
pp. 7107
Author(s):  
Pham Sy Dong ◽  
Nguyen Van Tuan ◽  
Le Trung Thanh ◽  
Nguyen Cong Thang ◽  
Viet Hung Cu ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
High Performance ◽  
High Performance Concrete ◽  
High Volume ◽  
Strength Development ◽  
Ultra High Performance Concrete ◽  
Heat Curing ◽  
Compressive Strength Development ◽  
Curing Condition

This research investigated the effect of fly ash content on the compressive strength development of ultra-high-performance concrete (UHPC) at different curing conditions, i.e., the standard curing condition and the heat curing. A total of 20 mixtures were prepared to cast specimens to measure the compressive strength at different ages from 3 days to 180 days. Additionally, 300 specimens were prepared to estimate the appropriate heat curing period at the early ages in terms of enhancing the 28-day compressive strength of UHPC with high content of fly ash (FA). From the regression analysis using test data, empirical equations were formulated to assess the compressive strength development of UHPC considering the FA content and maturity function. Test results revealed that the preference of the addition of FA for enhancing the compressive strength of UHPC requires the early heat curing procedure which can be recommended as at least 2 days under 90 °C. Moreover, the compressive strength of UHPC with FA under heat curing mostly reached its 28-day strength within 3 days. The proposed models based on the fib 2010 model can be a useful tool to reliably assess the compressive strength development of UHPC with high-volume fly ash (HVFA) (up to 70% fly ash content) under a heat curing condition that possesses a different performance from that of normal- and high-strength concrete. When 50% of the cement content was replaced by FA, the embodied CO2 emission for UHPC mixture reduced up to approximately 50%, which is comparable to the CO2 emission calculated from the conventional normal-strength concrete.

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

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.

Durability of High Performance Concrete in an Aggressive Environment

2014 ◽  
Vol 600 ◽  
pp. 485-494
Author(s):  
Ahcene Merida ◽  
Fattoum Kharchi ◽  
Rabah Chaid
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Research Work ◽  
Strength Development ◽  
Natural Pozzolan ◽  
Chloride Permeability ◽  
Volcanic Origin ◽  
Physico Chemical ◽  
Compressive Strength Development ◽  
Partial Cement Replacement

In Algeria, locally available natural pozzolan of volcanic origin material has the potential for use in environmental friendly concrete as a partial cement replacement. This paper studies the effect of replacement level of pozzolan concrete in sulphated environment. The natural pozzolan has a marked influence on the properties of the concrete. When it is coupled to a water reducing superplasticizer by a correct adjustment of the composition, it greatly improves the concrete properties. The analysis of experimental results on pozzolan concrete at 5% content and fineness of 9565 cm2/g exposed in sulphated environment, show that it positively contributes to the improvement of its mechanical, physical and physico-chemical characteristics. Trough this research work, parameters such as compressive strength development, chloride permeability, water absorption and sulphates resistance are studied.

Study on Carbonization Test of Manufactured Sand Concrete

2013 ◽  
Vol 423-426 ◽  
pp. 1036-1040
Author(s):  
Da Zhen Xu ◽  
Gu Hua Li ◽  
Zhuang Zhi Liao ◽  
Hai Wei Yan
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Mineral Admixtures ◽  
Test Results ◽  
Carbonation Depth ◽  
Manufactured Sand ◽  
Carbonation Resistance ◽  
Binder Ratio ◽  
The Impact ◽  
Water Binder Ratio

To study the impact of mineral admixtures and water-binder ratio on carbonization resistance of high performance manufactured sand concrete, high performance concrete of single mixed flyash, admixing silica fume and no admixture were compounded, carbonation depth of 3d, 7d, 14d and 28d was recorded by the way of indoor test. The test results show that with the decrease of water-binder ratio, carbonation resistance of high performance manufactured sand concrete increase, and when the concrete compressive strength is over 55Mpa, carbonation resistance is good, and when water-binder ratio is lower than 0.38, the impact of mineral admixtures on the carbonation resistance can be neglected.

scholarly journals Development of quaternary blended high performance concrete made with high reactivity metakaolin

2018 ◽  
Vol 7 (2.1) ◽  
pp. 79 ◽  
Author(s):  
V Srinivasa Reddy ◽  
R Nirmala
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
High Performance ◽  
High Performance Concrete ◽  
Research Work ◽  
High Strength ◽  
Supplementary Cementitious Materials ◽  
Ternary Blend ◽  
Strength Development ◽  
Strength Grade

In the last three decades, supplementary cementitious materials such as fly ash, silica fume and ground granulated blast furnace slag have been judiciously utilized as cement replacement materials as these can significantly enhance the strength and durability characteristics of concrete in comparison with ordinary Portland cement (OPC) alone. Hence, high-performance concretes can be produced at lower water/powder ratios by incorporating these supplementary materials. One of the main objectives of the present research work was to investigate synergistic action of binary, ternary and quaternary blended high strength grade (M80) concretes on its compressive strength. For blended high strength grade (M80) concrete mixes the optimum combinations are: Binary blend (95%OPC +5% FA, 95%OPC +5% MS and 95%OPC +5%MK), ternary blend (65%OPC+20%FA+15%MS) and quaternary blend (50%OPC+28%FA+11%MS+11%MK). Use of metakaolin in fly ash based blended concretes enhances compressive strength significantly and  found to be cost effective in terms of less cement usage, increased usage of fly ash and also plays a major role in early strength development  of fly ash based blended concrete.  

scholarly journals Effects of nano silica on carbonation resistance of concrete

2019 ◽  
Vol 275 ◽  
pp. 02001
Author(s):  
Xin Wan ◽  
Chun-fa Su ◽  
Leo Gu Li
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Cementitious Material ◽  
Nano Materials ◽  
Nano Silica ◽  
Carbonation Depth ◽  
Supplementary Cementitious Material ◽  
Carbonation Resistance ◽  
Cost Of Production

In tandem with recent development of nanotechnology and reduction in cost of production, many nano-materials have been tried in concrete. In this study, the effect of nano silica (NS) on the carbonation resistance of concrete was investigated by producing a number of trial concrete mixes with varying water and NS contents for carbonation depth test. The results demonstrated that the addition of NS could significantly reduce the 28-day and 56-day carbonation depths of concrete, indicating that NS may be a promising supplementary cementitious material for producing high-performance concrete.

An Assessment of Characteristics of Densified High-Performance Concrete Incorporating High Volume Fly Ash

2018 ◽  
Vol 923 ◽  
pp. 105-109
Author(s):  
Trong Phuoc Huynh ◽  
Chao Lung Hwang
Keyword(s):  
Fly Ash ◽  
High Performance ◽  
High Performance Concrete ◽  
High Volume ◽  
Strength Development ◽  
Hardened Concrete ◽  
Microstructural Characteristics ◽  
Design Algorithm ◽  
High Volume Fly Ash ◽  
Maximum Compressive Strength

The present study evaluates the mechanical-microstructural characteristics of the densified high-performance concrete (HPC) incorporating high volume fly ash (FA). The densified mixture design algorithm (DMDA) technology was applied to design the concrete proportions. The effects of various FA contents on both fresh and hardened concrete were investigated. A scanning electron microscope (SEM) was used to observe the microstructure of the concrete samples. The effectiveness of using DMDA in mix deign was also discussed in this study. As the experimental results, the FA content was found to affect the concrete properties significantly. The maximum compressive strength value of 65.1 MPa was obtained at the concrete samples containing 40% FA. Additionally, the 40% FA samples exhibited a denser microstructure as compared to the others. Generally, all of the tested concrete samples exhibited good performance in terms of workability, strength development, water absorption, and porosity. The results of this study further show the effectiveness of using DMDA technology in proportioning of the concrete mixture.

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.

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