scholarly journals The Durability of High-Strength Concrete Containing Waste Tire Steel Fiber and Coal Fly Ash

2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Babar Ali ◽  
Erol Yilmaz ◽  
Ahmad Raza Tahir ◽  
Fehmi Gamaoun ◽  
Mohamed Hechmi El Ouni ◽  
...  
Keyword(s):  
Fly Ash ◽  
High Strength Concrete ◽  
Steel Fiber ◽  
High Strength ◽  
Modulus Of Rupture ◽  
Acid Attack ◽  
Chloride Permeability ◽  
Immersion Method ◽  
Strength Concrete ◽  
Waste Tire

The demands for high-strength concrete (HSC) have been increasing rapidly in the construction industry due to the requirements of thin and durable structural elements. HSC is highly brittle. Therefore, to augment its ductility behavior, expensive fibers are used. These negative drawbacks of HSC can be controlled by incorporating waste materials into its manufacturing instead of conventional ones. Therefore, this study assessed the performance of HSC produced with different quantities of waste tire steel fiber (WSF) and fly ash (FA). WSF was used at two doses, namely, 0.5% and 1%, by volume in HSC, with low-to-medium volumes of FA, that is, 10%–35%. The studied durability parameters included rapid chloride permeability (RCP) and chloride penetration depth (CPD) by immersion method (28 and 120 days) and acid attack resistance (AAR) (28 and 120 days). Various basic mechanical properties of HSC were also analyzed, such as compressive strength (fCM), modulus of elasticity (ECM), splitting-tensile strength (fCTM), and modulus of rupture (fCRM). The results revealed that the damaging effect of WSF on the RCP resistance of HSC is probably due to the high conductivity of steel fibers. However, test results of CPD showed that WSF produced insignificant changes in chloride permeability of HSC. Furthermore, when made with FA, WSF-reinforced HSC yielded very low chloride permeability. Both WSF and FA contributed to the improvement in the AAR of HSC. WSF was highly useful to tensile properties while it showed minor effects on compressive properties (fCM and ECM). Optimum ductility and durability can be achieved with HSC incorporating 1% WSF and 10%–15% FA.

Study on the Optimum Mixing Condition for Control of Spalling in High Strength Concrete by a Orthogonal Array

2008 ◽  
Vol 385-387 ◽  
pp. 717-720
Author(s):  
Mun Hwan Lee ◽  
Young Hun Kim ◽  
Jong Chan Lee
Keyword(s):  
Orthogonal Array ◽  
High Strength Concrete ◽  
Functional Relationship ◽  
Steel Fiber ◽  
High Strength ◽  
Mixing Condition ◽  
Mixing Rate ◽  
Strength Concrete ◽  
Waste Tire ◽  
Tire Chips

This study proceeded to find the optimum mixing rate of a high strength concrete with 80MPa of compressive strength using meta-kaolin, waste tire chips, polypropylene, and steel fiber together for improvement of fire resistance performance. To estimate of optimum mixing rate, the orthogonal array method was used to plan the factors (slump flow, air content, compressive and flexural strength, steel bar temperature and concrete spalling volume) of high strength concretes and experiment was executed. Then the functional relationship of each factor was valuated by general linear model of ANOVA and functional relation between the factors and the data was estimated using response surface analysis. The optimum mixing rate was computed as 80% replacement of silica fume volume by meta-kaolin, 3% replacement of fine aggregates volume by waste tire chips and 0.2% additive rate of polypropylene fiber without steel fiber to the total mixed volume with this modeling of the functional relationship.

Effect of Silica Fume and Fly Ash on Compressive Strength and Weight Loss of High Strength Concrete Material in Sulfuric and Acetic Acid Attack

2017 ◽  
Vol 748 ◽  
pp. 301-310 ◽  
Author(s):  
Wei Liu ◽  
Hong Lin Tan ◽  
Cheng Lin Ni ◽  
Zhi Bin Chen ◽  
Tian Zong Luo ◽  
...  
Keyword(s):  
Weight Loss ◽  
Compressive Strength ◽  
Acetic Acid ◽  
Fly Ash ◽  
Silica Fume ◽  
High Strength Concrete ◽  
High Strength ◽  
Corrosion Mechanism ◽  
Acid Attack ◽  
Strength Concrete

This issue mainly studied the compressive strength and weight loss of high strength concrete in sulfuric and acetic acid attack. Different substitution amounts of silica fume and fly ash single single incorporated and co-incorporated in cement to form high strength concrete. Then weight losses, XRD and SEM were carried out to investigate compressive strength and acid resistance corrosion mechanism after leaching in 5% H2SO4 and 5% CH3COOH solution for 28 days. The results show S10F12 improves the compressive strength by 29.6%, 40.5% and 28.4% in 7, 28 and 56 days curing respectively compared to OPC. The improvement of resistant to 5% H2SO4 and 5% CH3COOH of S10F12 is 38.3% and 112.5% for 28 days immersion respectively, and S10f12 still has compressive strength of 58.8 MP and 45.9 MPa under 5% H2SO4 and 5% CH3COOH attack while OPC only has 38.8MPa and 21.6 MPa after 28 days immersion.

scholarly journals Effects of Micro Silica & Flyash on Strength & Durability Parameters of High Strength Concrete

2021 ◽  
Vol 9 (VI) ◽  
pp. 4650-4653
Author(s):  
Hiral Karavadra
Keyword(s):  
Fly Ash ◽  
High Strength Concrete ◽  
High Strength ◽  
Engineering Properties ◽  
Original Form ◽  
Nano Silica ◽  
Acid Attack ◽  
Strength Concrete ◽  
Micro Silica ◽  
Durability Of Concrete

High strength concrete is a term used to describe concrete with special properties not attributed to normal concrete. High-performance means that the concrete has one or more of the following properties: low shrinkage, low permeability, a high modulus of elasticity, or high strength. The application of nanotechnology in concrete has added a new dimension to the efforts to improve properties of High strength concrete. Nano materials, by virtue of their very small particle size can affect the concrete properties by altering the microstructure. Concrete can deteriorate for a variety of reasons, and concrete damage is often as result of combination of factors. This causes stresses in the concrete, which can eventually have resulted in cracking, delamination, and spalling. Concrete resists weathering action, chemical attack, and abrasion while maintaining its desired engineering properties throughout its lifespan. Different concretes require different degrees of durability depending on the exposure of environment and the properties desired. Durable concrete will retain its original form, quality and serviceability when exposed to its environment. The main characteristics influencing the durability of concrete is its permeability to the ingress of water, oxygen, carbon dioxide, chloride, sulphate and other deleterious substances. It became necessary to impart knowledge about durability of concrete and factors affecting durability to the society, as the wide use of concrete as a material in the constructions. This study concerns with the use of Nano silica of size 12 nm in M60 grade of concrete to improve the compressive strength of concrete and study on various durability parameters of High strength concrete. An experimental investigation is planned to carry out with different amount of Fly ash as 15% ,20%, 25%,30% and Micro silica as 5.5%,7%,8.5%,10% in concrete by weight of concrete. have been planned to carry out are workability, compressive test, flexural test, split tensile test. To study durability parameters of High strength concrete with nano silica Rapid chloride penetration test (RCPT), Water Sorptivity test, Acid attack test, Sulphate attack test are conduct. In this study it was observed that t the durability, strength and workability are increase as the percentage of fly ash & micro silica increses

scholarly journals Optimum Sustainable Mix Proportions of High Strength Concrete by Using Taguchi Method

2020 ◽  
Vol 14 (54) ◽  
pp. 211-225
Author(s):  
M.A. Warda ◽  
H.S. Khalil ◽  
Seleem Ahmad ◽  
I.M. Mahdi
Keyword(s):  
Fly Ash ◽  
High Strength Concrete ◽  
Design Methodology ◽  
Steel Fiber ◽  
Raw Materials ◽  
Aggregate Size ◽  
High Strength ◽  
Maximum Aggregate Size ◽  
Strength Concrete ◽  
Technical Requirements

In this study, mix proportion parameters of high strength concrete (HSC) were analyzed by using the Taguchi’s experiment design methodology for optimal design. For that purpose, mixtures are designed in a L27 orthogonal array with six factors, namely, ‘Silica Fume’, ‘Steel Fiber’, ‘Super-Plasticizer’, ‘Maximum Aggregate Size (AG)’, ‘Water / cementitious material (W/C) ratio’, ‘Fly Ash’. The mixtures were extensively tested to meet technical requirements of HSC. The experimental results were analyzed by using the Taguchi experimental design methodology. The best possible levels for mix proportions were determined for maximization of compressive strength at 7, 28, 56, 90 days, splitting tensile strength at 28 days, flexural strength at 28 days, and the slump. Also the best possible levels for mix proportions were determined for minimization of the production cost. It was found that steel fibers and fly ash are the most dominant factors in the process of optimization. The advantage of using steel fiber and fly ash was the reduced energy and cost associated with the raw materials which meant more sustainable concrete could be attained. It was also found that there is a necessity to apply a multi- response optimization to get the best mix proportions.

Study on Strength Development of High Strength Concrete Containing Alccofine and Fly-Ash

2012 ◽  
Vol 2 (3) ◽  
pp. 102-104 ◽  
Author(s):  
Suthar Sunil B ◽  
◽  
Dr. (Smt.) B. K. Shah Dr. (Smt.) B. K. Shah
Keyword(s):  
Fly Ash ◽  
High Strength Concrete ◽  
High Strength ◽  
Strength Development ◽  
Strength Concrete

Effect of Chopped Basalt Fiber on the Fresh and Hardened Properties of Fly Ash High Strength Concrete

2014 ◽  
Vol 567 ◽  
pp. 381-386 ◽  
Author(s):  
Nasir Shafiq ◽  
Muhd Fadhil Nuruddin ◽  
Ali Elheber Ahmed Elshekh ◽  
Ahmed Fathi Mohamed Salih
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
High Strength Concrete ◽  
Basalt Fiber ◽  
High Strength ◽  
Progressive Increase ◽  
Test Results ◽  
Strength Concrete ◽  
Hardened Properties ◽  
Chopped Basalt Fiber

In order to improve the mechanical properties of high strength concrete, HSC, several studies have been conducted using fly ash, FA. Researchers have made it possible to achieve 100-150MPa high strength concrete. Despite the popularity of this FAHSC, there is a major shortcoming in that it becomes more brittle, resulting in less than 0.1% tensile strain. The main objective of this work was to evaluate the fresh and hardened properties of FAHSC utilizing chopped basalt fiber stands, CBFS, as an internal strengthening addition material. This was achieved through a series of experimental works using a 20% replacement of cement by FA together with various contents of CBFS. Test results of concrete mixes in the fresh state showed no segregation, homogeneousness during the mixing period and workability ranging from 60 to 110 mm. Early and long terms of compressive strength did not show any improvement by using CBFS; in fact, it decreased. This was partially substituted by the effect of FA. Whereas, the split and flexural strengths of FASHC were significantly improved with increasing the content of CBFS as well as the percentage of the split and flexural tensile strength to the compressive strength. Also, test results showed a progressive increase in the areas under the stress-strain curves of the FAHSC strains after the CBFS addition. Therefore, the brittleness and toughness of the FAHSC were enhanced and the pattern of failure moved from brittle failure to ductile collapse using CBFS. It can be considered that the CBFS is a suitable strengthening material to produce ductile FAHSC.

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