scholarly journals Engineering, Durability, and Sustainability Properties Analysis of High-Volume, PCC Ash-Based Concrete

2020 ◽  
Vol 12 (9) ◽  
pp. 3520 ◽  
Author(s):  
Jaehyun Lee ◽  
Taegyu Lee ◽  
Jaewook Jeong ◽  
Jaemin Jeong
Keyword(s):  
Compressive Strength ◽  
Sustainability Assessment ◽  
High Volume ◽  
Field Application ◽  
Engineering Properties ◽  
Replacement Ratio ◽  
Durability Test ◽  
Mix Proportion ◽  
Binary Blended Concrete ◽  
Depletion Potential

This study aims to analyze the engineering properties and durability of binary blended concrete incorporating pulverized coal combustion ash (PCC ash) produced in local areas and assesses the sustainability. For this, tests and evaluations were carried out under conditions in which the unit binder weight and unit water weight were fixed at 330 and 175 kg/m3, respectively, while the replacement ratio of PCC ash increased from 0% to 70% at 10% intervals. The results showed that the replacement ratio of PCC ash should be less than 38.9% in order to secure the target compressive strength (fck = 24 MPa) at the age of 28 days in field application. The durability test found that as the replacement ratio of PCC ash increased, the carbonation depth and relative dynamic elastic modulus increased, while the chloride penetration depth decreased. However, the weight–loss ratio remained similar. It was also found that the optimum PCC ash replacement ratio, which satisfies four durability parameters and can ensure the target compressive strength (fck = 24 MPa) in the case of mix proportion conditions set in this study, ranges from 20.0% to 38.9%. The sustainability assessment results showed that as the replacement ratio of PCC ash increased, the global warming potential (GWP), ozone layer depletion potential (ODP), acidification potential (AP), eutrophication potential (EP), photochemical ozone creation potential (POCP) and abiotic depletion potential (ADP) decreased. Therefore, it was proven that the replacement of PCC ash instead of ordinary Portland cement (OPC) under the same concrete mix proportions is effective at reducing environmental impacts.

Experimental Study on Mix Proportion and Fundamental Properties of Recycled Concrete

2012 ◽  
Vol 598 ◽  
pp. 635-639
Author(s):  
Zhao Hua Du ◽  
Jie Wang
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Replacement Ratio ◽  
Mixture Ratio ◽  
Recycled Coarse Aggregate ◽  
Fundamental Properties ◽  
Mix Proportion ◽  
Strength Tests

In this paper, the mixture ratio of recycled concrete and its fundamental mechanics properties have been researched by experiments, which include the mechanical properties of recycled aggregate, the optimum mix design of the recycled concrete, compressive strength tests on concrete specimens using the broken abandoned concrete rubbles as recycled coarse aggregate, the replacement ratios of recycled coarse aggregate by mass to the natural coarse aggregate are 0, 0.3, 0.5, 0.70 and 1.0 respectively. The influences of the replacement ratio of recycled coarse aggregate by mass to the fundamental properties of the recycled concrete such as the compressive strength,and the elastic modulus are discussed and analyzed.and the optimum replacement ratio of recycled coarse aggregate by mass is suggested. These may be references to the applications of recycled concrete in engineering.

scholarly journals CONSISTENCY OF FLY ASH QUALITY FOR MAKING HIGH VOLUME FLY ASH CONCRETE

2017 ◽  
Vol 79 (7-2) ◽  
Author(s):  
Antoni Antoni ◽  
Alvin Krisnanta Widianto ◽  
Jerry Lakshmana Wiranegara ◽  
Djwantoro Hardjito
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Mineral Content ◽  
High Volume ◽  
Slight Variation ◽  
Replacement Ratio ◽  
Fly Ash Concrete ◽  
High Volume Fly Ash ◽  
Chemical Content ◽  
Particle Size And Shape

Fly ash is a by-product of coal burning and is widely used as a substitute for cement material. The advantages of using fly ash in concrete include the improvement of workability and reduction of bleeding and segregation. The problem often encountered when using fly ash is the uncertainty of the fly ash quality. The quality is influenced by the coal origin, burning technique, mineral content, and capturing method. In this study, the consistency of fly ash from one power plant source was investigated for making a high-volume fly ash (HVFA) mortar. Variations in fly ash can be detected by applying rapid indicators as suggested in this paper; i.e., the pH of the fly ash in aqueous solution, the percentage of fly ash particles passing sieve #325 and the superplasticizer demand for the targeted slump flow. The fly ash replacement ratio was varied from 10–60% of cement, by mass. The results showed a large variation in the chemical content of the fly ash as shown by variation in pH, whereas only slight variation in the physical properties of the fly ash, i.e. particle size and shape. Superplasticizer demand for the same flow diameter was reduced with the increase of fly ash content, whereas the optimum fly ash replacement ratio for maximum strength varied among fly ash from different sampling periods. The compressive strength could reach that of control specimens at a replacement ratio of 20–30%, and mortar compressive strength of 42 MPa was still achievable at a replacement ratio of 50%.

Research on the Feasibility of Concrete Incorporating Water Purification Sludge

2020 ◽  
Vol 1005 ◽  
pp. 47-56
Author(s):  
Chung Hao Wu ◽  
Hsien Sheng Peng ◽  
How Ji Chen
Keyword(s):  
Compressive Strength ◽  
Water Purification ◽  
Fine Aggregate ◽  
Test Results ◽  
Replacement Level ◽  
Replacement Ratio ◽  
Water Treatment Plants ◽  
Mix Proportion ◽  
Design Requirements ◽  
Compressive Strength Of Concrete

This study aims to develop the mix proportion of concrete incorporating water purification sludge (WPS), as parts of fine aggregate and consequently investigate its mechanical properties and durability. The experiments involve three sludges from Da-Nan, Lin-Nei and Nan-Hua water treatment plants in Taiwan. In addition to the control mixture without WPS, four replacement levels of 20%, 40%, 60% and 80% of fine aggregate were selected for preparing the concrete mixture. The concretes tested were designed to have three target compressive strengths of 14MPa, 18MPa and 21MPa. Test results show that the compressive strengths of the Da-Nan and Lin-Nei WPS concretes meet the design requirements, and the strength of the Nan-Hua WPS concrete is lower to be only suitable for application in low strength concretes. The shrinkage deformation of the Da-Nan and Lin-Nei WPS concretes increase with the increase of sludge replacement level, however, the shrinkage deformation decreases with the increase of the compressive strength of concrete. If the sludge replacement ratio is less than 40%, its effect on the compressive strength of the Da-Nan and Lin-Nei WPSs concrete is limited whether they are cured in water or in the air.

scholarly journals A Study on the Evaluation of Field Application of High-Fluidity Concrete Containing High Volume Fly Ash

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Yun-Wang Choi ◽  
Man-Seok Park ◽  
Byung-Keol Choi ◽  
Sung-Rok Oh
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Drying Shrinkage ◽  
High Volume ◽  
Field Application ◽  
Heat Of Hydration ◽  
Economic Feasibility ◽  
High Volume Fly Ash ◽  
Alternative Materials ◽  
Binder Ratio

In the recent concrete industry, high-fluidity concrete is being widely used for the pouring of dense reinforced concrete. Normally, in the case of high-fluidity concrete, it includes high binder contents, so it is necessary to replace part of the cement through admixtures such as fly ash to procure economic feasibility and durability. This study shows the mechanical properties and field applicability of high-fluidity concrete using mass of fly ash as alternative materials of cement. The high-fluidity concrete mixed with 50% fly ash was measured to manufacture concrete that applies low water/binder ratio to measure the mechanical characteristics as compressive strength and elastic modulus. Also, in order to evaluate the field applicability, high-fluidity concrete containing high volume fly ash was evaluated for fluidity, compressive strength, heat of hydration, and drying shrinkage of concrete.

scholarly journals Statistical Law and Predictive Analysis of Compressive Strength of Cemented Sand and Gravel

2020 ◽  
Vol 27 (1) ◽  
pp. 291-298
Author(s):  
Shoukai Chen ◽  
Yongqiwen Fu ◽  
Lei Guo ◽  
Shifeng Yang ◽  
Yajing Bie
Keyword(s):  
Compressive Strength ◽  
Back Propagation ◽  
Back Propagation Neural Network ◽  
Predictive Analysis ◽  
Distribution Law ◽  
Data Set ◽  
Cemented Sand ◽  
Mix Proportion ◽  
Kolmogorov Smirnov ◽  
Sand And Gravel

AbstractA data set of cemented sand and gravel (CSG) mix proportion and 28-day compressive strength was established, with outliers determined and removed based on the Boxplot. Then, the distribution law of compressive strength of CSG was analyzed using the skewness kurtosis and single-sample Kolmogorov-Smirnov tests. And with the help of Python software, a model based on Back Propagation neural network was built to predict the compressive strength of CSG according to its mix proportion. The results showed that the compressive strength follows the normal distribution law, the expected value and variance were 5.471 MPa and 3.962 MPa respectively, and the average relative error was 7.16%, indicating the predictability of compressive strength of CSG and its correlation with the mix proportion.

scholarly journals Experimental Study on Improvement of Marine Soft Soil with Alkali Residue

2018 ◽  
Vol 53 ◽  
pp. 04021
Author(s):  
SHAO Yong ◽  
LIU Xiao-li ◽  
ZHU Jin-jun
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Void Ratio ◽  
Soft Soil ◽  
Compressive Modulus ◽  
Engineering Properties ◽  
Test Results ◽  
Use Of Resources ◽  
One Year

Industrial alkali slag is the discharge waste in the process of alkali production. About one million tons of alkali slag is discharged in China in one year. It is a burden on the environment, whether it is directly stacked or discharged into the sea. If we can realize the use of resources, it is a multi-pronged move, so alkali slag is used to improve solidified marine soft soil in this paper. The test results show that the alkali residue can effectively improve the engineering properties of marine soft soil. Among them, the unconfined compressive strength and compressive modulus are increased by about 10 times, and the void ratio and plasticity index can all reach the level of general clay. It shows that alkali slag has the potential to improve marine soft soil and can be popularized in engineering.

Engineering properties of lightweight aggregate concrete containing limestone powder and high volume fly ash

2016 ◽  
Vol 135 ◽  
pp. 148-157 ◽  
Author(s):  
Payam Shafigh ◽  
Mohammad A. Nomeli ◽  
U. Johnson Alengaram ◽  
Hilmi Bin Mahmud ◽  
Mohd Zamin Jumaat
Keyword(s):  
Fly Ash ◽  
Lightweight Aggregate ◽  
High Volume ◽  
Limestone Powder ◽  
Engineering Properties ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete ◽  
High Volume Fly Ash

Optimization Research of Mix Proportion of Frost Resistance Construction of Concrete Based on the MATLAB Language

2014 ◽  
Vol 584-586 ◽  
pp. 1917-1921
Author(s):  
Jun Jie Zhang ◽  
Rui Hong Shao ◽  
Xiang Yi Meng
Keyword(s):  
Compressive Strength ◽  
Objective Function ◽  
Frost Resistance ◽  
Unit Volume ◽  
Influence Factors ◽  
Multi Objective Optimization ◽  
Cold Region ◽  
Freeze Thaw ◽  
Performance Indexes ◽  
Mix Proportion

Analyze the influence factors of mix proportion affecting concrete freeze-thaw damage. Use the five main performance indexes of the concrete, which are compressive strength, strength of extension, impermeability grade, and frost resistance grade and per unit volume cost concrete, as the objective function of multi-objective optimization equation. Invoke the fgoalattain function in the MATLAB Optimization Toolbox to solve. The optimized parameters of mix proportion of frost resistance construction of unit concrete in cold region are: concrete 1532.6kg, water 910kg, sand 5510.6kg, 5-20mm cobblestone 3747.2kg、20-40mm cobblestone 3658.6kg、40-80mm cobblestone 4733.5kg、80-150mm cobblestone 4738.1kg, and the dosage of water reducing agent is 7.3kg.

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