Posts

Low Concrete Cube or Cylinder Strength? A Practical QA/QC Investigation Workflow

-
A low concrete strength result is a signal to investigate—not an automatic verdict that a pour has failed. The reliable response is to verify the test record, trace the sample to the concrete and placement area, compare the result with the project’s acceptance rules, and let the responsible engineer decide whether further evaluation is needed. This guide gives a practical QA/QC workflow for site teams. It does not replace the governing building code, contract specification, testing standard, or the engineer of record’s judgment. Cube and cylinder results are not interchangeable unless the project documents provide a valid basis for comparison. 1. Confirm what the result actually represents Before discussing a “failure,” check the approved mix designation, specified strength, test age, specimen type and size, number of specimens, and the definition of a strength test in the project specification. Confirm units and whether the laboratory reported individual specimen values, an average...
Post a Comment
Read full article

What is Self Compacting Concrete (SCC)? Advantages and Disadvantages?

-
Self-Consolidating Concrete (SCC): Behavior, Tests, and Site Controls Self-consolidating concrete (SCC), also called self-compacting concrete, is proportioned to flow under its own weight, fill the formwork, pass through reinforcement, and remain sufficiently stable without mechanical vibration. The defining balance is flowability, passing ability, and resistance to segregation. A high slump by itself does not prove that concrete is SCC. How SCC is assessed Fresh-property tests are selected in the project specification or approved mix procedure. Slump-flow testing describes spread and may include a time measurement; a J-ring or equivalent passing test helps reveal blocking around reinforcement; segregation resistance is checked using an agreed method. These tests complement, rather than replace, the approved mix design, sampling plan, and acceptance criteria. Use the current adopted standard and project documents because methods and limits vary. Mixture and qualification SCC is designe...
Post a Comment
Read full article

Introduction of Geotechnical Earthquake Engineering

-
Image
  Geotechnical factors often exert a major influence on damage patterns and loss of life in earthquake events. For example, the localized patterns of heavy damage during the 1985 Mexico City and 1989 Loma Prieta, California, earthquakes provide grave illustrations of the importance of understanding the seismic response of deep clay deposits and loose, saturated sand deposits. The near failure of the Lower San Fernando dam in 1971 due to liquefaction of the upstream shell materials is another grave reminder that we must strive to understand the seismic response of critical earth structures. The characteristics and distribution of earth materials at a project site significantly influence the characteristics of the earthquake ground motions, and hence significantly influence the seismic response of the constructed facilities at a site. Moreover, the composition and geometry of earth structures, such as earth dams and solid waste landfills, significantly affect their seismic response. ...
2 comments
Read full article

Usage of Anti Termite Treatment of Soil before Concreting and Method Statement.

-
Image
Termites are eusocial insects that are classified at the taxonomic rank of infraorder Isoptera, or as epifamily Termitoidae within the cockroach order Blattodea. Termites were once classified in a separate order from cockroaches, but recent phylogenetic studies indicate that they evolved from close ancestors of cockroaches during the Jurassic or Triassic. However, the first termites possibly emerged during the Permian or even the Carboniferous. About 3,106 species are currently described, with a few hundred more left to be described. Although these insects are often called "white ants", they are not ants, popularly known as white ants cause considerable damage to wood works, furnishing etc. of buildings. There are more than 2,500 different types of termites in the world. To identify the termite and its uniqueness, the life cycle of termite is necessary to understand. Anti-termites are used before blinding to combat the problem.         The purpose of anti-termit...
4 comments
Read full article

What is Glass Fiber Reinforced Concrete (GRC)?

-
Image
Glassfibre Reinforced Concrete or GRC is one of the most versatile building materials available to architects and engineers. Composed principally of cement, sand and special alkali resistant (AR) glassfibres, GRC is a thin, high strength concrete with many applications in construction.The GRC-Glass Fibre Reinforced Concrete, which was first invented by 'pilkington' in UK and developed successfully by rest of the continent, is a product having unique combination of properties unchallenged by any other existing material in the construction industry. Glass Fibre Concrete can be moulded into wide varieties of shapes and contours to become an architectural element of any building. In fact CRC is tailor made; it can take any profile or shape as per consumer's requirement. This flexibility is what gives the material its tremendous demand in a wide ranging variety of applications.   INTRODUCTION :- WHAT'S GRC? Glass Fibre Reinforced Concrete (sometimes called Glass Fibre...
Post a Comment
Read full article