scholarly journals Thermal treatment of desert sand to produce construction material.

2018 ◽  
Vol 149 ◽  
pp. 01030 ◽  
Author(s):  
Frank Neumann ◽  
Manfred Curbach
Keyword(s):  
Reinforced Concrete ◽  
Chemical Composition ◽  
Thermal Treatment ◽  
Construction Industry ◽  
Construction Material ◽  
Hardened Concrete ◽  
Technological Solution ◽  
Desert Sand ◽  
Concrete Properties ◽  
Rounded Form

The concrete and reinforced concrete industry has refrained from using desert sand. The reasons for this are the rounded form of the particle, its grading and its chemical composition. This article provides an overview of the background, the constructability and technological challenges that the construction industry faces regarding construction sand’s shortage. Also, construction aggregates consumption and its influence on fresh and hardened concrete properties are described. The paper concludes by presenting several feasible approaches and provides a feasible technological solution.

scholarly journals Characterization of Sugar Cane Bagasse Ash: A Comparison to Densified Silica Fume and Fly Ash

2021 ◽  
Vol 9 (3) ◽  
pp. 88-93
Author(s):  
Asma A. Hussein
Keyword(s):  
Chemical Composition ◽  
Sugar Cane ◽  
Pozzolanic Reaction ◽  
Sugar Cane Bagasse ◽  
Hardened Concrete ◽  
Pozzolanic Material ◽  
Concrete Properties ◽  
Negative Impacts ◽  
Sugar Cane Bagasse Ash

In this study the Sugar cane bagasse ash (SCBA) was characterized for chemical composition, morphological and mineralogical properties. From XRF analysis it was found that the SCBA has SiO2, Al2O3, Fe2O3 and CaO content of 67.25%, 6.37%, 4.21% and 13% respectively and it has a very low LOI value of 0.34% and can be classified as Class F ASTM pozzolan according to ASTM C 618-2009. SCBA can be used as a pozzolanic material after grinding to less than 45 Micron. Based on the properties obtained from the characterization in this study it can be concluded that, utilization of SCBA in concrete will positively affect hardened concrete properties due to pozzolanic reaction, cementing properties and filling effect of SCBA. Moreover it will minimize the negative impacts associated with SCBA disposal.  

scholarly journals Comparison of Mechanical Properties of Lightweight and Normal Weight Concretes Reinforced with Steel Fibers

2018 ◽  
Vol 8 (2) ◽  
pp. 2741-2744
Author(s):  
A. Ali ◽  
Z. Soomro ◽  
S. Iqbal ◽  
N. Bhatti ◽  
A. F. Abro
Keyword(s):  
Reinforced Concrete ◽  
Strength Class ◽  
Lightweight Concrete ◽  
Normal Weight ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Hardened Concrete ◽  
Fiber Reinforced ◽  
Conventional Concrete ◽  
Concrete Properties

Compared to conventional concrete, lightweight concrete is more brittle in nature however, in many situations its application is advantageous due to its lower weight. The associated brittleness issue can be, to some extent, addressed by incorporation of discrete fibers. It is now established that fibers modify some fresh and hardened concrete properties. However, evaluation of those properties for lightweight fiber-reinforced concrete (LWFC) against conventional/normal weight concrete of similar strength class has not been done before. Current study not only discusses the change in these properties for lightweight concrete after the addition of steel fibers, but also presents a comparison of these properties with conventional concrete with and without fibers. Both the lightweight and conventional concrete were reinforced with similar types and quantity of fibers. Hooked end steel fibers were added in the quantities of 0, 20, 40 and 60kg/m3. For similar compressive strength class, results indicate that compared to normal weight fiber-reinforced concrete (NWFC), lightweight fiber-reinforced concrete (LWFC) has better fresh concrete properties, but performs poorly when tested for hardened concrete properties.

scholarly journals An investigation of the effect of different aggregate types on concrete properties with thin section and nondestructive methods

2021 ◽  
Vol 9 (3B) ◽  
Author(s):  
Kadir Güçlüer ◽  
Keyword(s):  
Construction Industry ◽  
Thin Section ◽  
Concrete Strength ◽  
Physical And Mechanical Properties ◽  
Textural Properties ◽  
Hardened Concrete ◽  
Curing Process ◽  
Nondestructive Methods ◽  
Concrete Properties ◽  
Different Types

Concrete is the most important material in construction industry. Aggregate is one of the most important components of concrete, which consists of many different components. In this study, concrete of constant water/cement ratio was produced by using different types of aggregates, and the effect of aggregate on concrete properties was investigated. After determining the physical properties of the aggregates, the textural properties of the aggregates were investigated with the help of image analysis. Standard water cure was applied to concrete test samples for 7, 28, 90, and 180 days. After the curing process, the physical and mechanical properties of the samples were determined by destructive and nondestructive methods. Thin section samples were taken from hardened concrete samples, and cement aggregate interface investigations were performed under microscope. As a result, it has been determined that aggregate type creates a change in concrete strength, and this situation is related to aggregate properties.

Methodology of studying the mechanical properties of composite materials (reinforced concrete)

2018 ◽  
Vol 84 (12) ◽  
pp. 61-67
Author(s):  
V. A. Eryshev
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Experimental Studies ◽  
Analytical Relationship ◽  
Hardened Concrete ◽  
Deformation Model ◽  
Joint Work ◽  
Concrete Shrinkage ◽  
Axial Tension ◽  
Tension And Compression

The mechanical properties of a complex composite material formed by steel and hardened concrete, are studied. A technique of operative quality control of new credible concrete and reinforcement, both in laboratory and field conditions is developed for determination of the strength and strain characteristics of materials, as well as cohesion forces determining their joint operation under load. The design of the mobile unit is presented. The unit provides a possibility of changing the direction of loading and testing the reinforced element of the given shape both for tension and compression. Moreover, the nomenclature of testing equipment and the number of molds for manufacturing concrete samples substantially decrease. Using the values of forcing resulting in concrete cracking when the joint work of concrete and reinforcement is disrupted the values of the inherent stresses and strains attributed to the concrete shrinkage are determined. An analytical relationship between the forces and deformations of the reinforced concrete sample with central reinforcement is derived for axial tension and compression, with allowance for strains and stresses in the reinforcement and concrete resulted from concrete shrinkage. The results of experimental studies are presented, including tension diagrams and diagrams of developing axial deformations with an increase in the load under the central loading of the reinforced elements. A methodology of accounting for stresses and deformations resulted from concrete shrinkage is developed. The applicability of the derived analytical relationships between stresses and deformations on the material diagrams to calculations of the reinforced concrete structures in the framework of the deformation model is estimated.

scholarly journals Statistical and Reliability Study on Shear Strength of Recycled Coarse Aggregate Reinforced Concrete Beams

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3321
Author(s):  
Hyunjin Ju ◽  
Meirzhan Yerzhanov ◽  
Alina Serik ◽  
Deuckhang Lee ◽  
Jong R. Kim
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Construction Material ◽  
Safety Margin ◽  
Shear Capacity ◽  
Reinforced Concrete Beams ◽  
Construction And Demolition Waste ◽  
Demolition Waste ◽  
Rc Structures ◽  
Coarse Aggregates

The consumption of structural concrete in the construction industry is rapidly growing, and concrete will remain the main construction material for increasing urbanization all over the world in the near future. Meanwhile, construction and demolition waste from concrete structures is also leading to a significant environmental problem. Therefore, a proper sustainable solution is needed to address this environmental concern. One of the solutions can be using recycled coarse aggregates (RCA) in reinforced concrete (RC) structures. Extensive research has been conducted in this area in recent years. However, the usage of RCA concrete in the industry is still limited due to the absence of structural regulations appropriate to the RCA concrete. This study addresses a safety margin of RCA concrete beams in terms of shear capacity which is comparable to natural coarse aggregates (NCA) concrete beams. To this end, a database for reinforced concrete beams made of recycled coarse aggregates with and without shear reinforcement was established, collecting the shear specimens available from various works in the existing literature. The database was used to statistically identify the strength margin between RCA and NCA concrete beams and to calculate its safety margin based on reliability analysis. Moreover, a comparability study of RCA beams was conducted with its control specimens and with a database for conventional RC beams.

Experimental of Inverted-T Shape Reinforced Concrete Wall Subjected to Blast Load

2021 ◽  
Vol 879 ◽  
pp. 254-262
Author(s):  
Mazlan Abu Seman ◽  
Sharifah Maszura Syed Mohsin ◽  
Ahmad Mujahid Ahmad Zaidi ◽  
Md Fuad Shah Koslan ◽  
Zainorizuan Mohd Jaini
Keyword(s):  
Reinforced Concrete ◽  
Blast Resistance ◽  
Retaining Wall ◽  
Construction Material ◽  
High Strength ◽  
Steel Reinforcement ◽  
Blast Load ◽  
Structural Element ◽  
Concrete Wall ◽  
Flexural Reinforcement

Reinforced concrete (RC) widely used as the construction material for the main structural element for many significant structures such as bridge and building because of its relatively high strength and economical. However, there still lacks research published regarding the appropriate reinforcement steel arrangement in a complete RC structure subjected to blast load. Most of the published experimental works focused on the small rectangular or square RC panel. From the record search, the approved design by professional engineers, when RC wall subjected to the possibility of blast load, both RC wall details either retaining wall or shear wall implemented. Therefore, the full-scale blast experiment is vital to appraise the appropriate steel reinforcement arrangement in the RC wall. The blast experiment indicated, with different steel reinforcement arrangement in the RC wall, the better blast resistance with the number of cracks on the RC wall is significantly less from one another for the wall with the arrangement of horizontal flexural reinforcement tied-outside the vertical flexural reinforcement and the hooked-in direction of vertical flexural steel reinforcement into the wall base.

Strategic Thinking of Construction Material Based on Ecology

2010 ◽  
Vol 150-151 ◽  
pp. 1199-1202
Author(s):  
Hui Pang ◽  
Bing Zhao ◽  
Xiao Min He
Keyword(s):  
Construction Industry ◽  
Construction Material ◽  
Strategic Thinking ◽  
Energy Structure ◽  
Chinese Government ◽  
Gas Emission ◽  
Green House Gas ◽  
The World ◽  
New Energy ◽  
New Construction

Chinese government has announced to the world that, the carbon emission will decrease by 40-45% in 2020, after the World Climate Summit in 2009. To ensure people’s living quality, while limit the green house gas emission, the construction industry - a big energy consumer - must endeavor to explore new construction method, research and develop new construction material and use new energy structure to make our promise come true.

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