scholarly journals An Experimental Programme on Fibre Reinforced Concrete made with OPC, Fly Ash and Metakaolin

2019 ◽  
Vol 8 (10) ◽  
pp. 3267-3270
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Fly Ash ◽  
Mineral Admixtures ◽  
Fibre Reinforced Concrete ◽  
Split Tensile Strength ◽  
Natural Sand ◽  
Manufactured Sand ◽  
Strength And Durability ◽  
Pozzolanic Properties

Most commonly used composite building material in construction industry is Concrete due to ease of construction and its properties like compressive strength and durability. The basic ingredient of Concrete having adhesive nature is Ordinary Portland Cement(OPC). OPC is being replaced with Fly Ash and Metakaolin as these mineral admixtures possess pozzolanic properties which credit for strength gain and cost reduction in concreting. In this investigation, OPC is replaced up to 40% with Fly Ash and Metakaolin for M35 grade of Fibre Reinforced Concrete(FRC). Natural sand is replaced completely with Manufactured sand (M-sand). Steel fibres @ 1% of binder are used. Mechanical properties like compressive strength and split tensile strength at 7 days and 28 days age are tested. Additionally durability tests like water absorption and sorptivity after 28days curing are conducted. The test results indicated that 30% replacement of OPC was optimum for strength criteria, workability of Concrete was decreased with increase in replacement of OPC with Fly Ash and Metakaolin together.

scholarly journals Mechanical and Durability Properties of Fly Ash and GGBS Based Fiber Reinforced Concrete

2019 ◽  
Vol 8 (11) ◽  
pp. 1099-1102
Keyword(s):  
Global Warming ◽  
Reinforced Concrete ◽  
Fly Ash ◽  
Fiber Reinforced Concrete ◽  
Mineral Admixtures ◽  
Fiber Reinforced ◽  
Split Tensile Strength ◽  
Natural Sand ◽  
Manufactured Sand ◽  
Durability Properties

Concrete is one of the most commonly and widely adopted material for construction. Cement is used as primary binder material to produce Concrete. However, every tonne of Cement production releases one tonne of greenhouse gases which results in global warming; due to continuous and ever increased usage of Cement and natural sand are causing uncontrollable global warming and depletion of natural resources respectively year by year. This tendency needs to be retarded if not arrested, by developing a comprehensive approach to use more and more pozzolanic mineral admixtures and manufactured sand (M-Sand) in Concrete. In this study on fiber reinforced concrete (with steel fiber @ 1% of binder), Ordinary Portland Cement (OPC) is replaced up to 50% with Fly Ash and Ground Granulated Blast-Furnace slag (GGBS) for M30 grade of Concrete. Mechanical properties like compressive strength and split tensile strength at 7 days and 28day age are tested. Additionally, durability tests like water absorption and sorptivity tests are conducted after 28days of curing. The test results indicated that workability was increased and there was no significant improvement in durability properties on increasing the percentage of OPC replacement. However, 30% of OPC replacement is found to be optimum for strength criteria

scholarly journals Strength and Durability Characteristics of Steel Fibre Reinforced Concrete with Mineral Admixtures

2019 ◽  
Vol 9 (1) ◽  
pp. 3893-3897
Keyword(s):  
Reinforced Concrete ◽  
Fly Ash ◽  
Steel Fibre ◽  
Mineral Admixtures ◽  
Fibre Reinforced Concrete ◽  
Test Results ◽  
Split Tensile Strength ◽  
Steel Fibre Reinforced Concrete ◽  
Granulated Blast Furnace Slag ◽  
Strength And Durability

The present investigation is carried out to study the strength and durability characteristics of steel fibre reinforced concrete, by replacing Ordinary Portland cement with Fly Ash, Ground Granulated Blast Furnace Slag (GGBS) and Metakaolin. In this study, cement is replaced by 30% and 40% with Fly Ash, GGBS and Metakaolin for M30 and M35 grades of concrete. Steel fibres @ 1% by weight of binder is used in all the mixes. Strength characteristics like compressive strength and split tensile strength are tested at 7 days and 28 days age. Additionally, durability tests such as water absorption and Sorptivity tests are conducted after 28days curing. The test results have shown that 30% replacement is optimum for strength criteria. And when metakaolin is used with fly ash, durability properties were improved and workability reduced.

Research of Performance of Low Amount of Cement Manufactured-Sand Concrete

2013 ◽  
Vol 357-360 ◽  
pp. 1200-1205
Author(s):  
Chun Hui Yu ◽  
Gu Hua Li ◽  
Jin Liang Gao ◽  
Qun Wei ◽  
Da Zhen Xu
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Grain Shape ◽  
Great Influence ◽  
Cementitious Materials ◽  
Natural Sand ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Manufactured Sand

Compared with natural sand, manufactured-sand is of small porosity, poor grain shape and graded, which impacts mixes workability and the properties after hardening. In Concrete, playing the role of retaining moisture water is mainly powder, including cement, powder in the sand and fly ash etc. The amount of powder has a great influence on the properties of concrete, especially on its workability. This paper mainly discusses the influence of amount of cement, cementitious materials, fly ash, water-cement ratio and other factors on the workability, compressive strength and shrinkage of concrete. The experiments show that, in the case of the low amount of cement, workability of the manufactured-sand concrete mixture, compressive strength and shrinkage deformation of test block all meet the actual requirements.

scholarly journals Influence of boulder machine-made sand powder on compressive strength of concrete

2021 ◽  
Vol 293 ◽  
pp. 02023
Author(s):  
Pengtao Wang
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Early Stage ◽  
Cementitious Materials ◽  
Mineral Admixtures ◽  
Rock Powder ◽  
Manufactured Sand ◽  
Slag Powder ◽  
Compressive Strength Of Concrete ◽  
Curing Age

In order to recycle the boulder powder produced in the process of manufactured sand production and reduce the cost of engineering concrete, this article studied the influence of boulders powder on the compressive strength of concrete. The results show that in the early stage of concrete test, the compressive strength of rock powder concrete is slightly lower than of fly ash and mineral powder concrete. With the development of curing age, the strength of boulders powder concrete developed slower. As the increase of boulders powder content, the compressive strength of different curing age gradually decreased, and it was suggested that the content of boulders powder should be controlled within 20% of cementitious materials mass. The positive effect of boulders powder fineness on the strength of concrete is limited, so it is suggested to use unprocessed collected boulders powder in the project, which is economical and environmentally friendly. With the adjustment of water-to-binder ratio, boulders powder can be prepared with different strength grades of concrete to meet the needs of engineering; the composite of boulders powder with traditional mineral admixtures, such as fly ash, and especially granulated blast furnace slag powder, can significantly improve the strength of concrete.

scholarly journals Establishing Relationship of Porosity and Strength of Fibre Reinforced Concrete

2019 ◽  
Vol 9 (2S2) ◽  
pp. 82-85
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Fibre Reinforced Concrete ◽  
Steel Fibres ◽  
The One ◽  
Strength And Durability ◽  
Relationship Of ◽  
The Relationship

There are numerous factors that affect the performance of concrete in terms of strength and durability aspects. Amongst, the pores in the concrete are the one which is playing a foremost role in deciding strength and durability characteristics. The presences of pores in the concrete are due to inferior quality of concrete ingredients, lack of w/c ratio, improper compaction, poor workmanship etc. Many past studies reveal that the presence of fillers materials may reduce the pores on the concrete. But at the same time, the strength and durability should improve a lot. Under these circumstances, the presence of steel fibres in the concrete will give a better solution to arrest the pores and furnish desired results in all aspects. This study is made an attempt to establish the relationship between porosity and compressive strength on the various proportions of steel fibres of M20 and M40 grade concrete

scholarly journals An Integrated Evaluation of Manufactured Sand and Metakaolin Impacts on Concrete Properties

2019 ◽  
Vol 8 (12) ◽  
pp. 188-192
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Normal Concrete ◽  
Split Tensile Strength ◽  
Natural Sand ◽  
Manufactured Sand ◽  
Concrete Properties ◽  
Concrete Mix

This paper deals with M25 Concrete mix in which replacing Natural Sand by the Manufacturing Sand of 35% and 65% at Cement by Metakaolin of 0, 5, 10, 15 and 20 percentages is compared with concrete had cement with Metakaolin at different percentages without replacement of natural sand .Workability is determined for Concrete and Cylindrical specimens of 150mm*300mm of size are casted to test Concrete properties such as Split Tensile strength(STS) and Compressive Strength(CS) of Concrete. These specimens are placed under curing of 7days, 28days and 60days; after that time placed under testing and compared the results with Normal Concrete.

scholarly journals Influence of Hybrid Fibre on the Mechanical Properties of Concrete

2019 ◽  
Vol 9 (1) ◽  
pp. 2637-2641
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Reinforced Concrete ◽  
Volume Fraction ◽  
Plain Concrete ◽  
Strength Test ◽  
Fibre Reinforced Concrete ◽  
Split Tensile Strength ◽  
Hybrid Fibre

This study presents the experimental investigation carried out to study the mechanical properties of concrete with and without the addition of fibres to it.d Concrete is the most consumed material in the world which has the property of strong in compression and weak in tension. Also plain concrete possess very limited ductility and little resistance to cracking. Hence fibres are introduced in the concrete to improve the tensile strength & brittleness of the concrete. These fibres which are closely spaced and dispersed uniformly in the concrete arrest the micro and macro cracks and improve the tensile strength of concrete. Concrete admixed with such fibres are known as Fibre Reinforced Concrete. The combination of two (or) more fibres called as Hybridization is carried out in this work. M25 grade concrete is designed as per IS 10262:2009 with the volume fraction of 0-1.5%. The workability of the concrete is affected due to the addition of fibres and hence super plasticizers are added to the concrete. The fibres considered for the study are (i) Crimped Steel Fibre (0-1.5%) and (ii) Shortcut Glass Fibre (0.1-0.2%). The behaviour of the hybrid fibre reinforced concrete is investigated by conducting compressive strength test on cube specimen of size 150mmx150mmx150mm and split tensile strength test on cylinder specimen of size 150mm diameter and 300mm height. From the experimental results, the optimum fibre combinations for maximum compressive strength and spilt tensile strength of concrete are identified.

scholarly journals An Experimental Study on the Effects and Properties of Concrete by Replacement of Natural Sand with Robosand as Fine Aggregate

2018 ◽  
pp. 55-62
Author(s):  
S. N. Manjunath ◽  
D. Mohammed Rafi ◽  
A. B. S. Dadapeer
Keyword(s):  
Experimental Study ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Construction Material ◽  
Fine Aggregate ◽  
River Sand ◽  
Split Tensile Strength ◽  
Natural Sand ◽  
Flexural Tensile Strength ◽  
Strength And Durability

Concrete is the most widely used composite construction material. Fine aggregate plays a very important role for imparting better properties to concrete in its fresh and hardened state. Generally, river sand was used as fine aggregate for construction. Due to the continuous mining of sand from riverbed led to the depletion of river sand and it became a scarce material. Also, sand mining from river bed caused a lot of environmental issues. As a substitute to river sand, Robo sand has been used. In this present experimental study a comparative study has been carried out to check the usability of Robo sand in place of natural sand. This study involves determination of some major properties of concrete like compressive strength, split tensile strength, flexural tensile strength and durability in acidic medium made of both the sands. Based on proposed studies, quality of Robo sand is equivalent to natural sand in many respects, such as cleanliness, grading, strength, angularity, specific gravity. Conclusion have been arrived that Robo sand produced from VSI (vertical shaft impact or) is a suitable and viable substitute to river sand and could be effectively used in making concrete which provides adequate strength and durability for the concrete. In the design of concrete structures, concrete is taken into account by taking its compressive strength value. The compressive strength of the concrete made of Robo sand is observed to be very nearer to the strength of the concrete made of natural sand in the present investigation, there by 100% replacement is reasonable.

scholarly journals An Experimental Programme on Frc with Opc, Flyash, Ggbs, and Metakaolin

2019 ◽  
Vol 8 (10) ◽  
pp. 3713-3717
Keyword(s):  
Fly Ash ◽  
Fiber Reinforced Concrete ◽  
Mineral Admixtures ◽  
Test Results ◽  
River Sand ◽  
Split Tensile Strength ◽  
Manufactured Sand ◽  
Granulated Blast Furnace Slag ◽  
Strength Tests ◽  
Lime Stone

The production of Ordinary Portland Cement (OPC) is increasing year by year world over. Further, the production of every tonne of OPC generates one tonne of green house gases, (CO2 ) which results in Global Warming. Usage of OPC is more in construction industry as it is a major ingredient in Concrete. As the usage of Concrete is increasing year by year, more and more is the OPC production and hence the environment is getting polluted; added to this undesirable scenario, the natural resources like lime stone used to manufacture cement and river sand are getting depleted year by year. In order to prevent the usage of large amounts of OPC in Concrete, mineral admixtures like Ground Granulated Blast furnace Slag (GGBS), Fly Ash and Metakaolin which are pozzolanic and cementitious in nature are adopted to replace certain percentages of OPC. Manufactured Sand (M-sand) is adopted to replace river sand. Experimental investigation is conducted on fiber reinforced concrete with steel fibers @1% of weight of binder by casting requisite number of cubes and cylinders of concrete of grade M25; in these mixes OPC is replaced with GGBS, Fly Ash and Metakaolin up to 45%. Mechanical properties are determined by conducting compressive strength and split tensile strength tests; additionally some of the durability properties are established by conducting Water absorption and Sorptivity tests. Test results are comparable between controlled concrete and innovative concrete of present investigation.

scholarly journals Experimental Study on the Strength Characteristics and Water Permeability of Hybrid Steel Fibre Reinforced Concrete

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
M. P. Singh ◽  
S. P. Singh ◽  
A. P. Singh
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Reinforced Concrete ◽  
Water Permeability ◽  
Steel Fibre ◽  
Volume Fraction ◽  
Strength Characteristics ◽  
Fibre Reinforced Concrete ◽  
Split Tensile Strength ◽  
Steel Fibre Reinforced Concrete

Results of an investigation conducted to study the effect of fibre hybridization on the strength characteristics such as compressive strength, split tensile strength, and water permeability of steel fibre reinforced concrete (SFRC) are presented. Steel fibres of different lengths, that is, 12.5 mm, 25 mm, and 50 mm, having constant diameter of 0.6 mm, were systematically combined in different mix proportions to obtain mono, binary, and ternary combinations at each of 0.5%, 1.0%, and 1.5% fibre volume fraction. A concrete mix containing no fibres was also cast for reference purpose. A total number of 1440 cube specimens of size 100*100*100 mm were tested, 480 each for compressive strength, split tensile strength, and water permeability at 7, 28, 90, and 120 days of curing. It has been observed from the results of this investigation that a fibre combination of 33% 12.5 mm + 33% 25 mm + 33% 50 mm long fibres can be adjudged as the most appropriate combination to be employed in hybrid steel fibre reinforced concrete (HySFRC) for optimum performance in terms of compressive strength, split tensile strength and water permeability requirements taken together.

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