influence of manufactured sand on high strength concrete ppt

influence of manufactured sand on high strength concrete ppt

M-sand (Manufactured Sand) - slideshare.net

Nov 14, 2016  M-sand (Manufactured Sand) M-Sand is manufactured sand. M-sand is crushed aggregates produced from hard granite stone which is cubically shaped with grounded edges, washed and graded with consistency to be used as a substitute of river sand. Globally, natural sand

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M sand - SlideShare

Oct 19, 2017  Manufactured sand is a substitute of river for construction purposes sand produced from hard granite stone by crushing. The crushed sand is of cubical shape with grounded edges, washed and graded to as a construction material. The size of manufactured sand (M-Sand) is less than 4.75mm. And it is also called as ‘ROBO SAND’.

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M sand - SlideShare

Dec 10, 2015  M20 grade concrete mix meet this requirement when M-sand is used as fine aggregate. Bond strength 13.9 MPa for river sand and 14.1 MPa for M-sand Stress-strain characteristics of concrete The strain corresponding to peak stress is 0.0017 and 0.0021 for the concrete using river sand and M-sand respectively. Compressive and flexural strength of ...

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Influence of manufactured sand’s characteristics on its ...

May 30, 2018  1. Introduction. Whereas the high-grade natural river sand (RS) gradually decreased in more and more areas in China, the market share of manufactured sand (MS) keeps sharp increasing for the boom of infrastructure construction , .Transported long distance by water or wind, RS is rounded and has characteristic abrasion patterns on its grain surface, while the MS is prepared by mechanical ...

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Influence of manufactured sand characteristics on strength ...

Highlights Manufactured sand characteristics have a great influence on pavement performances of concrete. Increasing rock microfines amount to 20% will increase strength and improve abrasion resistance of concrete. Sand with both large roughness and low crushing value is beneficial to enhance flexural strength and abrasion resistance. Concrete abrasion resistance has not relation with silicon ...

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Influence of manufactured sand’s characteristics on its ...

Manufactured sand (MS) is widely considered as an alternative of the river sand (RS) recently, and to clarify the influence significance and influence mechanism of MS characteristic parameters on its concrete performance is essential to its scientific application.

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Concrete - SlideShare

May 20, 2015  Concrete 1. LOGO “ Add your company slogan ” CONCRETE 2. themegallery INTRODUCTION OF CONCRETE Concrete is a mixture of sand, gravel, crushed rock or other aggregate held together by a hardened paste of cement and water. This mixture, when properly proportioned, is at first a plastic mass that can be cast or molded into a predetermined size and

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Influence of MB-value of manufactured sand on the ...

Jul 09, 2009  高达10%返现  Effects of Crusher Dust on Properties of Low/Medium Strength Concrete with Manufactured Sand[J]. Journal of Wuhan University of Technology, 2006,28(4): 27–30. CAS Google Scholar [4] VL Bonavetti, EF Irassar. The Effect of Stone Dust Content in Sand[J]. Cement and Concrete Research, 1994, 24(3): 580–590

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Manufactured Sand for Construction - Structural Guide

Continuous and Consistent Testing: It is required to test regularly to make sure the consistency of the manufactured sand.; Presence of Impurities: Impurities such as coal, bones, shells, mica, etc could be in the M-sand.Decaying of these materials with the time could reduce the strength of the concrete. Environmental Impact: Production of the M-sand causes environmental issues.

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3 Aggregate Properties - in

High strength and elasticity are desirable in aggregate base and surface courses. These qualities minimize the rate of disi ntegration and maximize the stability of the compacted material. The best results for portland cement concrete may be obtained by compromising between high and low strength

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Use of Manufactured Sand in Concrete and Construction An ...

The Civil engineers, Architects, Builders, and Contractors agree that the river sand, which is available today, is deficient in many respect. It does content very high silt fine particles (as in case of Filter sand). Presence of other impurities such as coal, bones, shells, mica and silt etc makes it inferior for the use in cement concrete.

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Ettringite Formation and the Performance of Concrete

Feb 28, 2000  detrimental to concrete performance. [Concrete in photo exposed to phenolphthalein stain to highlight features.] Fig. 3. This is a photomicrograph of a mortar sample that had been stored in water for six years at 20 °C. To simulate an over sulfated system, part of the sand was replaced by gypsum, and thus significant expansions occurred.

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Characterization of manufactured sand: Particle shape ...

Jul 01, 2016  Influence of MB-value of manufactured sand on the shrinkage and cracking of high strength concrete J. Wuhan Univ. Technol. , 24 ( 2 ) ( 2009 ) , pp. 321 - 325 CrossRef View Record in Scopus Google Scholar

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Mixing design and microstructure of ultra high strength ...

Jul 15, 2017  Therefore, preparing Ultra high strength concrete (UHSC) with manufactured sand (MS) is an approach to improve natural resource efficiency and reduce the environmental impact of the life cycle of concrete . In the past two decades, the infrastructure construction in China kept increasing with average rate more than 10% annually.

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Influence of Pore Structure on Compressive Strength of ...

Mar 16, 2014  It can be found from the test results that the influence of and on characteristics of the pore structure of the natural sand mortar is similar to the manufactured sand mortar. The total porosity of the manufactured sand mortar is higher, which is ascribed to the angular shape and rough texture of manufactured sand [2, 31].However, due to its better particle size distribution, the manufactured ...

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Effects of the lithologic character of manufactured sand ...

Dec 18, 2014  Six representative parent rocks of sand, including limestone, quartzite, gneisses, granite, Basalt and Marble were selected to conduct a systematical research on the effects of various lithologies of manufactured sand on the workability, mechanism properties, volume stability and durability of manufactured-sand concrete. The experimental results show that the strength of manufactured-sand ...

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High Strength and High Performance Concrete Materials and ...

However, high strength concrete is defined as concrete that has a compressive strength of 55MPa or higher, as per ACI Code. The use of high-performance concrete has overcome many problems observed in conventional concrete like less durability, weaker transition zone (aggregate-cement interface), low resistance to chemical attack and difficulty ...

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Autoclaved Aerated Concrete Blocks - SlideShare

Oct 26, 2015  Mechanical Properties Compressive Strength • Can carry loads of up to 8 MPa approximately 50% of the compressive strength of regular concrete. • Influenced by factors such as density, age, curing method, component and mix proportion. • The rate of strength development is initially very high and it gets decreased with age. 25 26. 26 27.

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Foam Concrete -Materials, Properties, Advantages and ...

Foam concrete is a type of lightweight concrete that is manufactured from cement, sand or fly ash, water, and the foam. Foam concrete is in the form of foamed grout or foamed mortar. Foam concrete can be defined as a cementitious material that consists of minimum 20 percent of foam, that is mechanically entrained into the plastic mortar.

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HOW AGGREGATE PROPERTIES AFFECTS CONCRETE ... -

Feb 15, 2019  INFLUENCE OF AGGREGATE PROPERTIES ON CONCRETE. Aggregates influence the properties of concrete/mortar such as water requirement, cohesiveness and workability of the concrete in plastic stage, while they influence strength, density, durability, permeability, surface finish and colour in hardened stage.

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Properties of Different Grades of Concrete Using Mix ...

According to Yunusa (2011) every concrete has its strength in N/mm2 when subject to test after 28 days of curing in any medium. The choice of concrete grade, depends on the purpose and usage as follows: Table 1: Concrete Grade Designation Concrete Grade N/mm2 Ratio Cement, Sand and Aggregates Usage 10 1:4:8 Blinding concrete

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Influence of fine recycled concrete aggregates on the ...

Apr 15, 2015  However, the influence of saturation state of recycled sand on the properties of mortars has not been systematically studied. Like concrete, mortar manufactured with FRCA generally present a lower strength and as a consequence a lesser durability than similar mortar composed of natural sand , , . Generally, compressive strength of mortar ...

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Perfect Concrete Mix Design

particles. The same is true for the type of sand that will be used – sands can be either natural (pit or river sand) or manufactured from crushing mined rock such as limestone down to a sand size. Gravel and natural sand make the most user-friendly mixes and generally have the lowest water demand.

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3 Aggregate Properties - in

High strength and elasticity are desirable in aggregate base and surface courses. These qualities minimize the rate of disi ntegration and maximize the stability of the compacted material. The best results for portland cement concrete may be obtained by compromising between high and low strength

Read More
Use of Manufactured Sand in Concrete and Construction An ...

The Civil engineers, Architects, Builders, and Contractors agree that the river sand, which is available today, is deficient in many respect. It does content very high silt fine particles (as in case of Filter sand). Presence of other impurities such as coal, bones, shells, mica and silt etc makes it inferior for the use in cement concrete.

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Title Slide - cement.org

Aggregates generally occupy 60% to 75% of the concrete volume and strongly influence the concrete’s fresh and hardened properties, mixture proportions, and economy. Fine aggregates (left) generally consist of natural sand or crushed stone with most particles smaller than 5 mm (0.2 in.).

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[PDF] STRENGTH AND DURABILITY PROPERTIES OF HIGH ...

The modernization of the construction sector led to the development of innovative materials in the last few decades. One such development is High Performance Concrete (HPC) and the HPC shall be produced by using silica fume. Another prime factor of concern is illegal sand mining which leads to the depletion of Natural Sand (NSand). Manufactured Sand (M-Sand) produced by the crushing of hard ...

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Air entrainment and its effects in concrete • Aggregate ...

Jul 12, 2010  Fine aggregate serves as a three-dimensional screen and traps the air; the more median sand there is in the total aggregate, the greater the air content of the concrete will be (Dolch 1984). Gradation has more influence in leaner mixes. Median sand ranging from the No. 30 sieve to the No. 100 is the most effective at entraining air .

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Research on Preparation of Ultra-High Strength High ...

This paper researches on the feasibility of preparing ultra-high strength high performance concrete with low quality fine aggregate, such as super fine sand (fineness moduls≤1.10), chippings and manufactured sand. The results shows: with low quality fine aggregate, ultra-high strength high performance concrete can be prepared, and with excellent fluidity and a compressive strength

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Factors Affecting Strength of Concrete - Concrete ...

Concrete Technology - Factors Affecting Strength of Concrete 1. Factors Affecting Strength of Concrete Concrete strength is affected by many factors, such as quality of raw materials, water/cement ratio, coarse/fine aggregate ratio, age of concrete, compaction of concrete, temperature, relative humidity and curing of concrete.

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Sand Replacement - an overview ScienceDirect Topics

Mar 03, 2010  The effects of sand replacement with fly ash on 7- and 28-day flexural strength of concrete paver blocks are presented in Figs. 30.10 and 30.11, respectively. It is observed from Fig. 30.10 that 7-day flexural strength increases as sand replacement increases up to 30%, and after that it decreases. However, 28-day flexural strength increases up ...

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Effects of Different Mineral Admixtures on the Properties ...

6. Properties of Fresh Concrete 6.1. Water Demand or Workability. According to Owens, 1979 [], strength performance of a single source/type of FA can be related to water demand and fineness.For a specific workability, water demand can be reduced by varying particle shape and using finer fractions of FA [].Dewar, 1986 [], correlated the mix design system with water reductions using FA and found ...

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Impact of High Temperature on the Compressive Strength of ECC

Jun 25, 2014  The influence of different cooling regimes (quenching in water and cooling in air) on the residual mechanical properties of ECC (engineered cementitious composites) exposed to high temperature up to 800°C was discussed in this paper. The specimens quenching in water gained better mechanical properties than the ones cooling in air. The strengthening effect of quenching for

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Aggregates - Cement

Aggregates. Aggregates are inert granular materials such as sand, gravel, or crushed stone that, along with water and portland cement, are an essential ingredient in concrete. For a good concrete mix, aggregates need to be clean, hard, strong particles free of absorbed chemicals or coatings of clay and other fine materials that could cause the ...

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Properties of Different Grades of Concrete Using Mix ...

According to Yunusa (2011) every concrete has its strength in N/mm2 when subject to test after 28 days of curing in any medium. The choice of concrete grade, depends on the purpose and usage as follows: Table 1: Concrete Grade Designation Concrete Grade N/mm2 Ratio Cement, Sand and Aggregates Usage 10 1:4:8 Blinding concrete

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QUALITY ASSURANCE for AGGREGATES

Surface texture of aggregate influences the bond between the aggregate and cement. Smooth surface such as that found on gravels will have a poor bond. Crushed aggregates have a rough texture and give a good mechanical bond with cement. However, gravel or rounded aggregates have been used for high strength concrete

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Factors affecting durability of concrete • Aggregate ...

Jan 27, 2010  Creep of plain concrete does not by itself affect strength, although under very high stresses creep hastens the approach of the limiting strain at which failure takes place. The influence of creep on the ultimate strength of a simply supported, reinforced concrete beam subjected to a sustained load is insignificant, but deflection increases ...

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