scholarly journals Experimental Research on Durability of Fly Ash Pavement Concrete and Mix Proportion Optimization

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Hong-xia Zhai ◽  
Yu-zhao Tang ◽  
Shu-hang Chen ◽  
Hui-hua Chen ◽  
Bao-quan Cheng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Raw Materials ◽  
Asphalt Pavement ◽  
Concrete Pavement ◽  
Industrial Wastes ◽  
Construction Technology ◽  
Fly Ash Concrete ◽  
Mix Proportion ◽  
Pavement Concrete

This paper focused on the optimization of the C40 fly ash concrete pavement, which was considered as a measure to accelerate the consumption of industrial solid wastes such as fly ash, committing to the goal of zero waste. By comparing with three groups of ordinary mix proportion, the performances (e.g., mechanical properties, durability, and brittle property) of the optimized mix proportion were evaluated via multiple mechanical and physical tests. Their air voids’ structure was characterized by the BJH method (a method to calculate pore size described by Barrett, Joyner, and Halenda), and the results were combined with the road performances of concrete to analyze the formation mechanism of high durability of optimized fly ash pavement concrete. As for the experimental results for the optimized, its 28 d compressive strength peaked at 50.8 MPa together with corresponding 28 d flexural strength at 8.2 MPa, which indicated a favorable mechanical performance for wide application in pavement construction. Except for the mechanical properties, the better durability indicators obtained after optimization also provided a more compact pore structure for the optimized. The raw materials and construction technology of the two kinds of pavements were compared. Promoting the use of optimized fly ash pavement concrete can break the situation of the asphalt pavement monopolizing heavy-haul highway and greatly reduce the industrial wastes which can be used as raw materials in the production of cement, such as blast furnace slag and fly ash. It was proved that the optimized fly ash concrete pavement can be used to replace the asphalt pavement under the premise of achieving the same working performances.

scholarly journals Comparison of mechanical properties of geopolymers from different raw materials with the addition of waste glass

2021 ◽  
pp. 252-261
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Fossil Fuels ◽  
Raw Materials ◽  
Waste Glass ◽  
Industrial Wastes ◽  
Raw Material ◽  
Sustainable Construction ◽  
Alkali Activation ◽  
Compressive And Flexural Strengths

The combustion of fossil fuels results in creating a lot of solid wastes such as fly ash and slag. However, these environmentally unfriendly materials can be used as a raw material for alkali activation – geopolymerization. Although these wastes have been successfully used in industrial production for several decades, its use does not achieve the level of its potential. Today, to achieve a sustainable construction industry, alternative cement has been extensively investigated. Geopolymer (GP) is a kind of material that is obtained from the alkaline activator, and it can be produced from industrial wastes or by-products. The aim of this work was to describe the improvement of mechanical properties of alkali-activated binders – geopolymers made of fly ash and blast furnace slag. The effect of the addition of waste glass in three different values feed into fly ash or GGBFS, and its impact on mechanical properties (compressive and flexural strengths) of geopolymers was examined. The highest value of compressive strength was achieved with 20% waste glass addition to a fly ash sample on 90th day 58,9 MPa. The waste glass was added in the form of broken and crushed glass particles.

scholarly journals Effect of Nano-CaCO3 on the Mechanical Properties and Durability of Concrete Incorporating Fly Ash

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Yanqun Sun ◽  
Peng Zhang ◽  
Weina Guo ◽  
Jiuwen Bao ◽  
Chengping Qu
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Second Phase ◽  
Fly Ash Concrete ◽  
Concrete Mixtures ◽  
Orthogonal Experiments ◽  
Mix Proportion ◽  
Electron Microscopy Analysis ◽  
Binder Ratio ◽  
Durability Of Concrete

Concrete mixtures consisting of nanomaterials and fly ash have been shown to be effective for improving the performance of concrete. This study investigates the combined effects of nano-CaCO3 and fly ash on the mechanical properties and durability of concrete; the mix proportion is optimized through orthogonal experiments. In the first phase, nine concrete mixtures were prepared with three water-to-binder ratios (0.4, 0.5, and 0.6), three fly ash contents (15%, 20%, and 25% replacement of the cement weight), and three nano-CaCO3 contents (1%, 2%, and 3% replacement of the cement weight). Based on the orthogonal analysis, the optimal concrete mix proportion was determined as a water-to-binder ratio of 0.4, 20% fly ash, and 1% nano-CaCO3. In the second phase, further investigations were carried out to examine the superiority of the optimal concrete and evaluate the synergistic effect of nano-CaCO3 and fly ash. The results showed that nano-CaCO3 contributed to increasing the compressive strength of fly ash concrete at the early ages, but its effect was quite limited at later ages. Furthermore, the scanning electron microscopy analysis revealed that the seeding effect, filling effect, and pozzolanic effect were the primary mechanisms for the improvement of concrete performance.

scholarly journals Experimental Study on Mechanical Properties of Concrete in the Complex Environment of China-Laos (Moding-Vientiane) Railway

2020 ◽  
Author(s):  
Youhao Zhang ◽  
Wenqi Hou ◽  
Jihong Xi
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Raw Materials ◽  
Test Results ◽  
Railway Bridges ◽  
Mix Proportion ◽  
Concrete Mix ◽  
Engineering Environment ◽  
Complex Engineering ◽  
Made In China

In order to make different strength grades of concrete which meet the requirements of the complex engineering environment of China-Laos (Moding-Vientiane) Railway, the raw materials such as cement fabricated in Laos and water reducing agent made in China were chosen, the effect rules of size and the effect rules of different fly ash contents on the mechanical properties of C55 concrete were studied through the concrete mix proportion design and the mechanical property tests of different strength index. And the concrete mix proportion of C20∼C60 was determined. The results showed that the concrete which meet the requirements of China railway standards (TB10424-2010) can be configured according to the mix proportion in this paper. In the case of the additive is fly ash only, the appropriate content of fly ash in C55 concrete for China-Laos (Moding-Vientiane) Railway bridges was determined to be 15%. The test results in this paper had been successfully applied to the concrete construction of real bridges.

RECYCLABILITY OF FLY ASH CONCRETE PAVEMENT MADE WITH LIMESTONE AGGREGATE

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Isamu Yoshitake ◽  
Takeo Ishida ◽  
Sunao Fukumoto
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Chemical Properties ◽  
Concrete Pavement ◽  
Physical And Chemical Properties ◽  
Cement Production ◽  
Fly Ash Concrete ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Pavement Concrete

The present study aims to develop a recyclable concrete pavement incorporating fly ash. All aggregates used in the concrete were crushed limestone sand and gravel, so the concrete pavement can be recycled into raw materials for cement production. To use fly ash as much as possible and to obtain adequate strength development, the present study focuses on pavement concrete made with cement-replacement ratio of 40% by mass. The foci of the study were to confirm the recyclability for cement production and to evaluate the applicability of the recyclable pavement concrete. Portland cement was made with the fly ash concrete to examine fundamental properties of the cement. Physical and chemical properties of the recycled cement were tested and compared to the properties of ordinary Portland cement defined in Japanese standards. The fundamental tests confirmed that the physical and chemical properties of the recycled cement meet the requirements of Portland cement. It is concluded that the recyclable fly ash concrete pavement having high early strength is a preferred material in terms of sustainability.

Key Technique on the Process Control for Construction of Hohhot Circle Expressway Asphalt Pavements

2012 ◽  
Vol 256-259 ◽  
pp. 1748-1753
Author(s):  
Bin Zhao ◽  
Pei Wen Hao
Keyword(s):  
Inner Mongolia ◽  
Raw Materials ◽  
Asphalt Pavement ◽  
Load Capacity ◽  
Asphalt Mixture ◽  
Natural Increase ◽  
Rigid Base ◽  
Construction Technology ◽  
Pavement Structure ◽  
Major Section

As vehicle flow on arterial highway in Inner Mongolia sharply increased, the originally designed natural increase rate of 8% per year has been exceeded on the vehicle flow in some sections. According to statistics, monthly average vehicle flow on major section of G6 expressway has reached a standard flow of 67478 vehicles per day and night, of which in 70-80% are large ones for coal transportation. Therefore, pavement load and road capacity have exceed the designed expressway load capacity. At present, semi-rigid base asphalt pavement structure is still widely used for high-grade highway pavement in Inner Mongolia. With years of construction for such pavement structure, a great deal of valuable experience has been gained on construction technology. However, there are still a few deficiencies in the quality of raw materials, gradation control of asphalt mixture and adjustment of equipment, etc. Hohhot circle expressway connects with the G6 and G7 expressways, suffering from problems such as large vehicle flow and load overweight. This paper introduced a key technique that should be properly controlled during construction of such pavement structure, emphasized technique control and management of the following aspects, i.e. ballast sizes and gradation control, asphalt concrete mixture, adjustment of pavers, validation of mixing proportion in production and reasonable arrangement of process, and summarized corresponding technical measures taken during construction of asphalt pavement in this project.

scholarly journals RESEARCH OF PHYSICAL AND MECHANICAL PROPERTIES OF BLENDED BRICKS WİTH FLY ASH BASED, BLAST FURNACE SLAG ADDITION

2019 ◽  
Vol 7 (1) ◽  
pp. 126-136
Author(s):  
Hakan Çağlar ◽  
Arzu Çağlar
Keyword(s):  
Mechanical Properties ◽  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Physical And Mechanical Properties ◽  
Industrial Wastes ◽  
Second Stage ◽  
Volume Weight ◽  
History Of ◽  
Furnace Slag

In this study, it is aimed to make improvements on blended brick (1) which is the first building material has a history of at least 10,000 years. To the blended brick which is a traditional material was kept constant at 5% the addition of fly ash which is industrial waste. It was aim of determine of the effect on the physical and mechanical properties of the blended brick using different ratios (5%, 10%, 15% and 20%) blast furnace slag. In the first stage, the production of fly ash-based blast furnace slag doped sample of blended brick was performed. In the second stage, a variety of experiments were applied to determine the physical and mechanical properties of the blended brick sample. As a result; It has been determined that unit volume weight and compressive strength decreases with the use of industrial wastes in blended brick production. They have occured an increase in porosity and capillary water absorption values. The use of industrial wastes in the production of blended bricks will contribute both improve the properties of the bricks and   the reduction of wastes left to the environment.

Characterization of Lime-Fly Ash Concrete Pavement under Load

1978 ◽  
Vol 104 (2) ◽  
pp. 151-168
Author(s):  
Madan G. Arora ◽  
Sudarshan K. Khanna
Keyword(s):  
Fly Ash ◽  
Concrete Pavement ◽  
Fly Ash Concrete

Development of New Geopolymer-Based System for Challenging Well Conditions

2021 ◽  
Author(s):  
Siti Humairah Abd Rahman ◽  
Anatoly Medvedev ◽  
Andrey Yakovlev ◽  
Yon Azwa Sazali ◽  
Bipin Jain ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Construction Industry ◽  
Raw Materials ◽  
Critical Role ◽  
Acid Resistance ◽  
Oil Industry ◽  
Rapid Screening ◽  
Fluid Loss ◽  
Screening Methods

Abstract With the development of new oil formations and with the advent of new directions in the global energy sector, new requirements for materials for well construction appear. With the close attention to environmental footprint and unique properties, one of the promising materials for well cementing is geopolymers. Being a relatively new material, they are characterized by low carbon footprint, high acid resistance and attractive mechanical properties. This article is aimed at developing new geopolymer slurries for the oil industry, their characterization and field implementation analysis. With the ultimate goal of developing a methodology for the analysis of raw materials and designing the geopolymer slurries, studies were carried out on various raw materials, including different types of fly ash. Based on the data obtained and rapid screening methods, an approach was developed to formulate a geopolymer composition recipe. Since not all cement additives directly work in geopolymers, special attention was paid to control the thickening time and fluid loss. The methods of XRD, XRF, ICP-MS, density, particle size distribution measurements as well as API methods of cement testing were used to understand the composition and structure of the materials obtained, their properties and design limitations. A special approach was applied to study the acid resistance of the materials obtained and to compare with conventional cements and slags. Using one of the most common sources of aluminosilicate, fly ash, formulations with a density of 13.5 – 16.5 lbm/galUS were tested. A sensitivity analysis showed that the type of activator and its composition play a critical role both in the mechanical properties of the final product and in the solidification time and rheological properties of the product. The use of several samples of fly ash, significantly different in composition, made it possible to formulate the basic rules for the design of geopolymers for the oil industry. An analysis was also carried out on 10 different agents for filtration and 7 moderators to find a working formulation for the temperature range up to 100°C. The samples were systematically examined for changes in composition, strength, and acid resistance was previously measured. Despite the emergence of examples of the use of geopolymers in the construction industry and examples of laboratory testing of geopolymers for the oil industry, to the best of our knowledge, there has been no evidence of pumping geopolymers into a well. Our work is an attempt to develop an adaptation of the construction industry knowledge to the unique high pressure, high temperature conditions of the oil and gas industry. The ambitions of this work go far beyond the laboratory tests and involve yard test experiments.

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