Preview

A Study of Mix Design of Concrete Hollow Blocks Using Crushed Powder Like Glass as Supplementary Aggregates

Better Essays
Open Document
Open Document
9869 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
A Study of Mix Design of Concrete Hollow Blocks Using Crushed Powder Like Glass as Supplementary Aggregates
Chapter I
Introduction

Concrete has been used in the construction industry for centuries. A typical concrete is a mixture of fine aggregate (sand), coarse aggregate (rock), cement, and water. Nowadays the usage of concrete is increasing from time to time due to the rapid development of construction industry.Today, there are many ways to enhance the quality and properties of concrete. One of the technological advances in improving the quality of concrete is Self-Consolidating Concrete.

Self-Consolidating Concrete (SCC) has been described as "the most revolutionary development in concrete construction for several decades". Originally developed to reduce the need of skilled laborers for concrete filling in construction. It has proved beneficial economically because of a number of factors. For example, fasterconstruction, reduction in site manpower, better surface finishes, easier placing, improved durability, greater freedom in structural designthinner concrete sections, safer working environment, and reduced noise levels by the absence of concrete vibrators.

According to Welton (1987), Vibration of fresh concrete has five objectives and as follows:
1. Elimination of mechanical voids in the mass.
2. Elimination of unintentional air voids.
3. Removal of unnecessary water.
4. Shaking the particles in the mix into their closest nesting, providing uniform dispersion and distribution of the large particles, but still retaining the coating of all particle surfaces with cement mortar.
5. Reduction of micro-pores and micro-capillaries.

According Forssblad (1987) unvibrated fresh flowing concrete has thefollowing shortcomings and as follows: 1. It contains a number of small and medium size air bubbles. 2. There is reduced bond strength to reinforcement. 3. There are often settlement cracks around steel rebars.

Originally developed in Japan, SCC technology was made possible by the much earlier development of Superplasticizers for concrete. SCC has now been taken



Bibliography: Manual for Testing Self-Compacting Concrete (Cemex Inc.) MohdFakri Bin Muda (2010) CristianDruta (2009). Tensile Strength and Bonding Characteristics of Self Compacting Concrete, Polytechnic University of Bucharest .

You May Also Find These Documents Helpful

  • Powerful Essays

    For concrete is a mixture of coarse (stone or brick chips) and fine (generally sand or crushed stone) aggregates with a binder material like usually Portland cement. When mixed with a small amount of water, the cement hydrates to form microscopic opaque crystal lattices encapsulating and locking the aggregate into a rigid structure. Typical concrete mixes have high resistance to compressive stresses about 28 MPa. However, any appreciable tension (due to bending) will break the microscopic rigid lattice, resulting in cracking and separation of the concrete. For this reason, typical non-reinforced concrete must be well supported to prevent the development of tension.…

    • 7570 Words
    • 31 Pages
    Powerful Essays
  • Good Essays

    Concrete

    • 333 Words
    • 1 Page

    Concrete is used in the majority of buildings, bridges, tunnels and dams for its strength. It gains strength over time, and is not weakened by moisture, mold or pests. Concrete structures can also withstand natural disasters such as earthquakes and hurricanes. Roman buildings over 1,500 years old such as the Colosseum are living examples of the strength and durability of concrete. In the result of concrete being motionless, compressed, and non-porous, it does not attract mold or lose its key properties over time. Concrete compared to other building materials is extremely durable, yet remains affordable.…

    • 333 Words
    • 1 Page
    Good Essays
  • Good Essays

    Roman Pozzolanic Concrete

    • 680 Words
    • 3 Pages

    Concrete is a mixture made up of an aggregate, a binding agent and water. Typically the aggregate is gravel, sand or small stones. This is the filler that gives the final product its mass. The binding agent is what causes the mixture to set and harden. When the aggregate and binding agent are combined with water a thick mixture is created that can be poured into a form which then solidifies. In early civilization the binding agent was typically limestone powder or gypsum. The Romans discovered the use of pozzolana as a binding agent (Yegeul, n.d.). Pozzolana is a fine, sandy, volcanic ash which when used as a binding agent creates a strong durable concrete (Wikipedia, 2011, Pozzolana).…

    • 680 Words
    • 3 Pages
    Good Essays
  • Powerful Essays

    After reading this chapter, you will: 1. Be able to distinguish between such terms as ‘‘systems,’’ ‘‘information systems,’’ ‘‘information technology,’’ and ‘‘accounting information systems.’’ 2. Learn how information technology (IT) influences accounting systems. 3. Be familiar with suspicious activity reporting. 4. Understand how financial reporting is changing with advances in IT, such as XBRL. 5. Appreciate how IT allows management accountants to use business intelligence to create dashboards and scorecards. 6. Know why auditors provide a variety of assurance services. 7. Be more aware of what is new in the area of accounting information systems. 8. Be familiar with career opportunities that combine accounting and IT knowledge and skills.…

    • 14782 Words
    • 60 Pages
    Powerful Essays
  • Better Essays

    Aggregate Testing

    • 1894 Words
    • 8 Pages

    British Standards Institution, 2002. BS EN 12620:2002+A1 Aggregates. Part 1: Aggregates for concrete. Guidance on the use of BS EN 12620. British Standards Online [Online] Available through: University of Plymouth < http://primo.plymouth.ac.uk> [Accessed 12 November 2012].…

    • 1894 Words
    • 8 Pages
    Better Essays
  • Better Essays

    References: Ferron, R., & Foillard, K. (2014). “Laboratory 4, Compressive, Flexural, and Tensile Strength of Concrete,”…

    • 1620 Words
    • 7 Pages
    Better Essays
  • Good Essays

    Aggregate is one of the basic constituents of concrete. Its quality is of considerable importance because about three-quarter of the volume of concrete is occupied by aggregates. One of the physical properties of aggregate that influence the property of concrete is the grading of aggregate. The grading of aggregate defines the proportions of particles of different size in the aggregate. The grading of fine (size < 5 mm) and coarse (size > 5 mm) aggregates are generally required to be within the limits specified in BS 882: 1992.…

    • 1066 Words
    • 5 Pages
    Good Essays
  • Better Essays

    The conductive concrete can be used as a structural material and bonds well with normal…

    • 5461 Words
    • 22 Pages
    Better Essays
  • Powerful Essays

    L-Box Test Lab Report

    • 1430 Words
    • 6 Pages

    Abstract --- Reutilization of waste materials in the building industry helps to prevent environmental pollution whilst contributing to the design of more economical buildings. Over the years, there has been increase in the accumulation of tyre rubber due to the increase in the production of vehicles. Sometimes this waste tyre rubber is burned which leads to environmental pollution. So the use of this type waste tyre rubber for the replacement of aggregates in concrete leads to the decrease in the accumulation of waste tyre rubber and also reduces pollution. Another problem that we are facing is the durability of concrete structures. In order to get durable structures adequate compaction by skilled workers is required. Now a day there is a reduction in skilled workers. This leads…

    • 1430 Words
    • 6 Pages
    Powerful Essays
  • Powerful Essays

    SELF-COMPACTING CONCRETE

    • 3012 Words
    • 13 Pages

    concrete, which can be compacted into every corner of a formwork, purely by means of its…

    • 3012 Words
    • 13 Pages
    Powerful Essays
  • Good Essays

    Many empirical equations for predicting the modulus of elasticity as a function of compressive strength can be found in the current literature. They are obtained from experiments performed on a restricted number of concrete specimens subjected to uniaxial compression. Thus, the existing equations cannot cover the entire experimental data. This is due to the fact that mechanical properties of concrete are highly dependent on the types and proportions of binders and aggregates. To introduce a new reliable formula, more than 3000 data sets, obtained by many investigators using various materials, have been collected and analyzed statistically. The compressive strengths of the considered concretes range from 40 to 160 MPa (5.8 to 23.2 ksi). As a result, a practical and universal equation, which also takes into consideration the types of coarse aggregates and mineral admixtures, is proposed.…

    • 2667 Words
    • 8 Pages
    Good Essays
  • Satisfactory Essays

    By absorbing new technologies from overseas and domestic, the mobile concrete mixing plant has such characteristics as accurate weighing, homogeneous and efficient mixing, fast and clean delivery, convenient to move and operate, safe trailing, etc. It is the ideal choice for projects that require frequent movement from one construction site to another.…

    • 310 Words
    • 2 Pages
    Satisfactory Essays
  • Powerful Essays

    Concrete as a material has been used since time immemorial due to its cost effectiveness and versatility.V. Jayachandran Nair, Sales Manager of Bengaluru based Bostik India Private Limited, one of the largest adhesive and sealant companies in the world cites the reasons for leakage in concrete to use of excess water, inadequate compaction, long- term drying shrinkage, thermal shrinkage, crack in transition zone, structural stresses and lime leaching.…

    • 2920 Words
    • 10 Pages
    Powerful Essays
  • Good Essays

    Concrete can handle the compression stresses 10 times more than the tension and the most of loads in our life is compression. and its better resistance to fire. also it is a britile material which gives the advantage to make a rigid structure. and it is easy to handle over specially now there is…

    • 918 Words
    • 4 Pages
    Good Essays
  • Powerful Essays

    Prestressed Concrete

    • 3059 Words
    • 13 Pages

    The development of early cracks in reinforced concrete due to incompatibility in the strains of steel & concrete was perhaps the starting point in the development of new material like “Prestressed Concrete”. Prestressed Concrete is a method for overcoming concrete’s natural weakness in tension.…

    • 3059 Words
    • 13 Pages
    Powerful Essays

Related Topics