• Concrete Design & Production - cement.org

    Ultra High Performance Concrete. Ultra High Performance Concrete (UHPC), also known as reactive powder concrete (RPC), is a high-strength, ductile material formulated by combining portland cement, silica fume, quartz flour, fine silica sand, high-range water reducer, water, and steel or organic fibers.

  • Mix Design and Pumped Concrete - WordPress.com

    Mix Design and Pumped Concrete A simple method of concrete mix design for pumpable concrete based on an estimated weight of the concrete per unit volume is described in the paper. The tables and figures presented are worked out by the author from a wide range of Indian materials. The method is suitable for normal weight concrete with admixture.

  • Admixtures for Concrete - University of Memphis

    high dosages of conventional (normal) water reducers. Normal water reducers are intended for concretes with slumps of 100 to 125 mm (4 to 5 in.). Mid-range water reducers can be used to reduce stickiness and improve ... high-strength concrete Admixtures for Concrete. LH N M B X

  • HOW AGGREGATE PROPERTIES AFFECTS CONCRETE PROPERTIES ...

    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 …

  • WHAT ARE THE FACTORS INFLUENCING COMPRESSIVE STRENGTH …

    Factors Affecting Strength Test Results of Concrete Compressive strength is the most important property of concrete. The compressive strength of concrete is determined in the laboratory in controlled conditions. On the basis of this test result we judge the quality of concrete. But sometimes the strength test results vary so widely that it becomes difficult […]

  • 5.5.2 - The Interfacial Transition Zone

    5.5.2 The interfacial transition zone (ITZ) Concrete is made up of two distinctly different constituents, the cement paste and the aggregate, and there is a tendency to assume that the properties of each of these is unaffected by the presence of the other.

  • High Performance Concrete Topic

    High-performance concrete (HPC) is concrete that has been designed to be more durable and, if necessary, stronger than conventional concrete. HPC mixtures are composed of essentially the same materials as conventional concrete mixtures, but the proportions are designed, or engineered, to provide the strength and durability needed for the structural and environmental requirements of the project.

  • High Strength Concrete — What, why, & how? – Nevada Ready …

    It is a type of high performance concrete generally with a specified compressive strength of 6,000 psi (40 MPa) or greater. The compressive strength is measured on 6 × 12 inch (150 × 300 mm) or 4 × 8 inch (100 × 200 mm) test cylinders generally at 56 or 90-days …

  • The Effect of Aggregate Properties on Concrete - engr.psu.edu

    The compressive aggregate strength is an important factor in the selection of aggregate. When determining the strength of normal concrete, most concrete aggregates are several times stronger than the other components in concrete and therefore not a factor in the strength of normal strength concrete.

  • 15 Factors Affecting Durability of Concrete

    Concrete is heterogeneous material, when fresh concrete is subjected to high temperature rate of hydration gets affected and strength and durability becomes reduced. Concrete ingredients have different thermal coefficients, so at higher temperatures, spalling and deterioration of concrete happens.

  • SAND, SAND ADDITIVES and SAND PROPERTİES

    Green strength. The green sand, after water has been mixed into it, must have adequate strength and plasticity for making and handling of the mold. 2. Dry strength. As a casting is poured, sand adjacent to the hot metal quickly loses its water as steam. The dry sand must have strength to

  • Properties of Concrete - The University of Memphis

    Properties of Concrete Concrete is an artificial conglomerate stone made essentially of Portland cement, water, and aggregates. Properties of Concrete While cement in one form or another has been around for centuries, the type we use was invented in 1824 in Britain. It was named Portland cement because it looked like the

  • Effect of Manufactured Sand on Mechanical Properties of ...

    Effect of Manufactured Sand on Mechanical Properties of Concrete Vaishali.P 1, Dr. G.Dhanalakshmi, M.E., ... Now the sand available contains very high amount of silt ... The Split Tensile Strength of the concrete having M-sand obtained from Karur is 14.6% and 32.49% higher than that of the concrete having Pudukottai and Padalur ...

  • EFFECT OF CURING METHODS ON THE COMPRESSIVE …

    for concrete production, it is important to study the e ect of di erent curing method which best adapts to each individual casting process. This study presents the e ects of di erent curing methods on the compressive strength of concrete cured for 7, 14, 21 and 28 days. Nigerian Journal of Technology Vol. 30, No. 3, October 2011.

  • Ultra-High Strength Concrete Mixtures Using Local Materials

    Ultra-High Strength Concrete Mixtures Using Local Materials Srinivas Allena1 and Craig M. Newtson2 ... local sand with a top size of 0.0236 in. (600 μm), and locally available Type I/II cement ... ductility with the use of ultra high strength concrete encourages researchers and engineers

  • HIGH STRENGTH CONCRETE PPT - SlideShare

    Mar 30, 2015· high strength concrete ppt 1. • history of concrete • introduction to concrete • types of concrete • high strenght concrete • guidlines for the selection of materials • difference b/w nsc and hsc • application of hsc

  • Properties of Concrete at Elevated Temperatures

    Fire response of concrete structural members is dependent on the thermal, mechanical, and deformation properties of concrete. These properties vary significantly with temperature and also depend on the composition and characteristics of concrete batch mix as well as heating rate and other environmental conditions. In this chapter, the key characteristics of concrete are outlined.

  • Development of High Performance Concrete and Evaluation of ...

    concrete with a water binder ratio of 0.33 and a slump in the range of 8 to 9 inches. Workability characteristics of the fresh concrete are analyzed and hardened concrete properties tested in this research are compressive strength, chloride ion permeability, and creep and drying shrinkage properties.

  • High-Strength Concrete - cement.org

    High-strength concrete is specified where reduced weight is important or where architectural considerations call for small support elements. By carrying loads more efficiently than normal-strength concrete, high-strength concrete also reduces the total amount of material placed and lowers the overall cost of the structure.

  • Factors Affecting Strength of Concrete - The Constructor

    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.

  • Aggregates ppt - SlideShare

    Apr 28, 2013· 22Type of structure Max. size of aggregate1. Mass concrete work 40 mmi.e. dams, retaining walls,piers and abutments, etc.2. R.C.C work 20 mmi.e. beams, columns, etc3. Flooring 10 mmIt may be clearly noted that the size andshape of the aggregate particles influence theproperties of freshly mixed concrete more ascompared to those of hardened ...

  • Chapter 8 Design of Concrete Mixes

    Chapter 8 Design of Concrete Mixes Total 60 Chapter 5 Concrete Mix Design ... should be reduced as the sand becomes finer, ie as the percentage passing the 600 µm test sieve ... • The type and source of the aggregate has a considerable influence on the compressive strength of concrete.

  • Influence of manufactured sand's characteristics on its ...

    May 30, 2018· 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.

  • Effect of Cement Replacement by Silica Fume and Fly Ash ...

    Explore Effect of Cement Replacement by Silica Fume and Fly Ash with Free Download of Seminar Report and PPT in PDF and DOC Format. Also Explore the Seminar Topics Paper on Effect of Cement Replacement by Silica Fume and Fly Ash with Abstract or Synopsis, Documentation on Advantages and Disadvantages, Base Paper Presentation Slides for IEEE Final Year Civil Engineering CE or IEEE …

  • Introduction to Concrete - Portland Cement Association

    building height became possible as concrete strength increased. In the 1950s, 34 MPa (5000 psi) was considered high strength; by 1990, two high-rise buildings were constructed in Seattle using concrete with strengths of up to 131 MPa (19,000 psi). Ultra-high-strength concrete is now manufactured with strengths in excess of 150 MPa (21,750 psi).

  • Strength of Concrete - University of Washington

    Concrete Technology Strength of Concrete Professor Kamran M. Nemati Winter Quarter 2015 1 Concrete Technology Strength of Concrete Concrete Technology 2 Strength of Concrete In concrete design and quality control, strength is the property generally specified. This is because, compared to most other properties, testing strength is relatively easy.

  • 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 ...

  • What is Concrete Strength and what are the factors ...

    Upto 1975, the mass production of cement in India was only OPC-33 Grade. It was found difficulty in obtaining high strength concrete with this cement. The consumer has been normally finding it difficult to get consistent and ensured supply of high strength cement for prestressed concrete and certain items of precast concrete.

  • (PDF) mica in concrete | Gerald Maregesi - Academia.edu

    The high- water demand of the Kimbi sand can be associated with the presence of muscovite [white] mica in the sand. 8. SUMMARY AND CONCLUSION The study has shown that the compressive strength of concrete made using micaceous sand is reduced compared to concrete made from non-micaceous sand.

  • EFFECTS OF AGGREGATE TYPE, SIZE, AND CONTENT ON …

    The effects of aggregate type, size, and content on the behavior of normal and high-strength concrete, and the relationships between compressive strength, flexural strength, and fracture energy are discussed. The concrete mixtures incorporate either basalt or crushed limestone, aggregate sizes of 12 mm ('h in.) or 19 mm (:Y. in.), and