Hadi Azizi; Mohsen Amouzadeh Omrani
Abstract
Some of the important benefits of cold asphalt include conservation of natural resources, cost and energy reduction. Meanwhile, warm asphalt mixtures have higher durability and resistance than cold mixtures, but the use of hot asphalt mixtures causes environmental pollution, the release of toxic and ...
Read More
Some of the important benefits of cold asphalt include conservation of natural resources, cost and energy reduction. Meanwhile, warm asphalt mixtures have higher durability and resistance than cold mixtures, but the use of hot asphalt mixtures causes environmental pollution, the release of toxic and harmful gases, and also reduces the safety of workers. Therefore, today, the use of cold asphalt mixtures is increasing in order to protect the environment and also work risks, which is used with this type of asphalt along with emulsion bitumen. However, the use of cold asphalt produced in factories with emulsion bitumen leads to problems such as rutting, thermal cracks, reduction in strength, etc. Therefore, the need to use additives in order to improve the functional characteristics of this type of asphalt is felt. Considering the importance of the subject, in this research, a review of the studies conducted in the field of the effect of different additives on the functional characteristics of recycled cold asphalt produced with emulsion bitumen has been done. Finally, according to the results of the studies, it can be said that asphalt mixtures produced with emulsion bitumen have very low resistance to environmental factors and humidity, and therefore the use of additives is recommended. The results showed that the use of different additives improves the resistance of the asphalt mixture against moisture, which is more evident in the samples modified by combining polymer with cement and polymer with lime than other additives. shows. Also, due to creating a three-dimensional network in the bitumen and actually reinforcing the bitumen, polymer materials can increase the asphalt resistance and Marshall endurance.
Ali Hasannejad esfandani; hassan divandari
Volume 3, Issue 10 , January 2022, , Pages 29-48
Abstract
One of the new types of concrete that helps to solve problems such as cracking, grooving in concrete, and is known as one of the most popular concretes in the civil engineering community, is roller concrete (RCC) which is made in construction. Types of road pavements and structural uses can be used. ...
Read More
One of the new types of concrete that helps to solve problems such as cracking, grooving in concrete, and is known as one of the most popular concretes in the civil engineering community, is roller concrete (RCC) which is made in construction. Types of road pavements and structural uses can be used. In recent years Due to the high cost of pavement construction and environmental considerations, various waste and recycled materials have been used in concrete mixes and roller concrete. In this research, a relatively comprehensive review of the composition of waste and recycled materials on the mechanical properties of roller concrete is presented. The mechanical properties of roller concrete by replacing coarse and fine-grained materials in concrete with recycled materials including rubber chips and steel slag have been investigated in a leading study. In the researches, compressive strength, indirect tensile and three-point bending tests have been performed on 7 and 28 day samples.3-point bending test is used to obtain flexural strength and toughness and energy absorption.
Kian Asghari; Mehdi Vajdian
Volume 2, Issue 5 , August 2020, , Pages 69-86
Abstract
The destruction of concrete depends on the formation of cracks and cracks in the cracks. As the load increases, the cracks are connected together, forming the cracks. In order to overcome this problem as well as the creation of homogeneous conditions, in the last few decades, a series of thin strands ...
Read More
The destruction of concrete depends on the formation of cracks and cracks in the cracks. As the load increases, the cracks are connected together, forming the cracks. In order to overcome this problem as well as the creation of homogeneous conditions, in the last few decades, a series of thin strands used in all the volume of concrete are used, which are called fibers. Fibers concrete is actually a composite that increases the tensile strength by applying the reinforcing fibers inside the concrete mixture. This composite combination has the proper integration and continuity and the possibility of using concrete as a possible material to produce wiggly - resistant surfaces. Fibers concrete is also highly capable of absorbing high energy and is not easily break down under the impact of impact loads. The historical witness of this technology is the great use of building buildings. As a matter of fact, fibers concrete is the advanced form of this technology, which is replaced by natural and synthetic fibres, replacement of straw, and cement replacement in the thatch. The fibers used in this study is of the type of polyolefin fiber and polyolefine. In this research, the reason for the necessity of using fibers, construction method, mechanical propeties and applications of fiber concrete and obtaining conversion coefficients of standard cubic samples of fiber concrete to standard cylindrical sample of fiber concrete according to the results of applications and research has been discussed.
Azin Ayneh
Volume 2, Issue 4 , July 2020, , Pages 36-49
Abstract
Proper use of materials in the building requires knowledge of their basic properties. In the past, our traditional architects were fully aware of the characteristics of the materials they used and used different materials in different conditions and uses, and based on adherence to the rules of the class, ...
Read More
Proper use of materials in the building requires knowledge of their basic properties. In the past, our traditional architects were fully aware of the characteristics of the materials they used and used different materials in different conditions and uses, and based on adherence to the rules of the class, the architect committed himself to building the building correctly and accurately. they knew. Therefore, it is important to know the technical specifications of the materials. In principle, the use of materials is permitted if their technical properties comply with the national standards and regulations laid down in this regard. The national standards and regulations of each country are based on the physical, mechanical and chemical properties of the materials. Today, in addition to the above, environmental sustainability criteria and prevention of damage to nature are also considered as a determining factor in the method of production and use of materials. Physical properties; Mechanical and chemical materials are one of the most basic features that should be considered when using and using materials and based on the time and location of the building.
Ghasem pachideh; amin moshtagh
Volume 1, Issue 7 , December 2019, , Pages 27-53
Abstract
Given the growing demand for lightweight concrete research to obtain optimal results from lightweight concrete is inevitable. In this study, the influence of steel fibers, polypropylene and glass on the tensile strength, compressive strength and water absorption (durability) of lightweight concrete is ...
Read More
Given the growing demand for lightweight concrete research to obtain optimal results from lightweight concrete is inevitable. In this study, the influence of steel fibers, polypropylene and glass on the tensile strength, compressive strength and water absorption (durability) of lightweight concrete is investigated. For this purpose, initially 10 basic mixing schemes in which all the properties of the fixed materials and only the percentage of fibers were changed, and one design as the reference mixing scheme (concrete without fibers) were developed. After selecting the control design, the tests of compressive strength, tensile strength, percentage Water absorption (durability) was performed on the samples at 7 days and 28 days. According to the results, it can be concluded that steel fibers are very useful in increasing the compressive and tensile strength of lightweight plastic containing fiber, which in some stages of testing increases the compressive and tensile strength of concrete by more than 40% but poly fibers Propylene and glass, due to their physical and physical properties, are most effective in reducing the percentage of water absorption or increasing the durability of concrete in corrosive environments, although they have a slight effect on the compressive and tensile strength of concrete.
nasser abootaleb
Volume 1, Issue 1 , June 2019, , Pages 19-38
Abstract
One of the biggest environmental problems and problems in the world can be recycled and the reuse of worn plastics, which, due to their indissolubility, remains in the environment, and their disintegration may last more than a hundred years. One of the most widely used plastic molds, PETs, or polyethylene ...
Read More
One of the biggest environmental problems and problems in the world can be recycled and the reuse of worn plastics, which, due to their indissolubility, remains in the environment, and their disintegration may last more than a hundred years. One of the most widely used plastic molds, PETs, or polyethylene terephthalate, is the reuse of these wastes in concrete can be one of the ways to recycle this product. In the field of using polymeric waste, especially PET, in self-compacting concrete, research is in its early stages. Highly flowing self-compacting concrete can be a good solution for the construction of structures with complex and rebar shapes without the need for a vibrator. Therefore, in this paper, laboratory studies on self-compacting concrete containing different percentages of crushed petroleum fraction particles as part of the sand with two water-to-cement ratios were 0.45 and 0.41. Also, metalaole and microsilica additives were used as a substitute for cement to improve the efficiency of the compound, and then the flow of slump, funnel V, box L, compressive strength, tensile strength and elasticity modulus were used. As the water-cement ratio increases in the mixing scheme of self-compacting concrete, self-cleaning properties decrease, as well as decreases in compressive and tensile strengths, by partially compensating the pozzolan to concrete. The results show that the addition of crushed PET particles to the concrete composition reduces self-healing properties, but replacing the sand with the crushed particles of PET can make the composition of fresh concrete self sufficiently acceptable. By examining the results of the mechanical tests of hardened concrete, it can be concluded that increasing the amount of PET particles in concrete leads to a decrease in ... compressive strength, tensile strength and elastic modulus, although this loss of properties by replacing part of the cement with metalaole and microsilica individually and simultaneously It is partially offset. How many ? cankan Translations of can NounFrequency قوطی can, canister, tin, box, packet, package حلبی tin, tinfoil, can قوطی کنسرو can Verb قادر بودن can, may قدرت داشتن can امکان داشتن can, may زندان کردن prison, lock up, can در قوطی ریختن can اخراج کردن exorcise, out, exorcize, deport, oust, can توانایی داشتن can, may Definitions of Can. Noun 1 a cylindrical metal container. a garbage can Synonyms: tin can aluminum can canister spray can garbage can trash can Verb 1 be able to. they can run fast Abbreviation 1 Canada or Canadian. 6 more definitions Examples of can children can be very cruel 29 more examples Synonyms of can Noun tin can lav potty stern can buoy canful Verb fire put up give notice 55 more synonyms
