Electroflux Magnetic Crack Detector equipment is designed for non-destructive testing (NDT Test) of ferrous iron and steel parts. Electroflux equipment will locate cracks and other defects in parts which can be magnetized. When properly used, Electroflux will locate such defects as fatigue cracks, heat cracks, grinding checks, forgings laps, shrinks and tears in castings, improper welds and inherent defects in metal such as seams and inclusions as well as cracks due to over stressing of parts. These defects may not be visible to the naked eye but can be located rapidly and accurately with this equipment.
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The compacting factor is defined as the ratio of the weight of partially compacted concrete to the weight of fully compacted concrete. It shall be stated to the nearest second decimal place. Compacting factor test is adopted to determine the workability of concrete where the nominal size of the aggregate does not exceed 40 mm. It is based on the definition, that workability is that property of concrete, which determines the amount of work required to produce full compaction. The test consists essentially of applying a standard amount of work to a standard quantity of concrete and measuring the resulting compaction.
Slump test is the most commonly used method of measuring consistency or workability of fresh concrete which can be employed either in laboratory or at the site of work. It is not a suitable method for very wet or very dry concrete. It is used conveniently as a control test and gives an indication of the uniformity of the concrete from batch to batch.
Concrete is basically a heterogeneous mixture, which consists of cement, sand, stone aggregates and water. For a big project, where the higher grade of concrete is used, mix design is must to determine the quantities of the materials required to maintain the grade. But when a lesser grade of concrete is used, quantity analysis for Cement, Sand And Aggregate is done by some basic calculation.
The requirement of concrete aggregate in India is large. Corresponding to the current annual production of cement of 300 million tons, total requirement of coarse and fine aggregate for use in cement concrete, mortar and plasters of about 1500 metric tons per year is a safe estimate. There is difficulty in obtaining natural aggregates within economic distances. Search for alternate sources of aggregates thus assumes importance. One such alternative is recycled concrete aggregate derived from construction and demolition wastes, which allow conservation of natural resources and land.
Introduction: Repair and Rehabilitation is the process of improving an existing structure for new conditions of use. It aims at restoring the structure to its original service level it once had and has now lost. In some cases, this consists of giving the structure the service level which was intended, but could not be attained …
Bacterial Concrete or Self-Healing Concrete (SHC) is a modern approach in civil engineering for repair purpose. As the name suggests, this type of concrete can heal itself when cracks appear after curing and hardening. In this article, I will discuss it’s brief history, mechanism, production, advantages, disadvantages and some other aspects. Before we get started, …
Have you been told, “Add some water, the concrete looks very hard”? Is that right? Adding more water at the site level to increase the concrete workability?? Absolutely Not… What is Water-Cement Ratio? Water Cement Ratio means the ratio between the weight of water to the weight of cement used in the concrete mix. Normally water-cement …