A Presentation on Petronas Twin Towers of Kuala Lumpur

6rd tallest building in the world

A Presentation on Petronas  Twin Towers, Kuala Lumpur, Malaysia By- Nawal Kishor Dwivedi General Facts 6rd tallest building in the world as on March 2014 Tallest building in world from 1998 to 2004 Preceded by International Commerce Center, Hong Kong ,China Surpassed by Nanjing Greenland Financial Complex ,China Location : KLLC , Jalan Ampang of … Read more

Sikkim Earthquake Of 14 February 2006

Sikkim Earthquake February 2006 location

Sikkim Earthquake Of 14 February 2006 Moderate earthquake (reported as Mw 5.3 by USGS and as ML 5.7 by IMD)  occurred in the state of Sikkim (India) on February 14 2006 at 06:25:23 a.m. local time.  At 27.35°N 88.35°E, near Ralang (South Sikkim), with a focal depth of 30 km (www.usgs.gov)  At 27.7°N 88.8°E, near … Read more

Guidelines to Construct Joints in Concrete

Various Types of joints

Guidelines to Construct Joints in Concrete Joints are to be carefully designed and appropriately constructed in order to avoid uncontrolled cracking of concrete slab. The following are recommended practices that should be observed: The maximum joint spacing should be 24 to 36 times the thickness of the slab. As an example, in a 5-inch thick … Read more

What is Concrete and what are the Properties of Concrete

Grand Coulee Dam - Properties of Concrete

What is Concrete and what are the Properties of Concrete Concrete is a mixture of portland cement, water, aggregates, and in some cases, admixtures. The cement and water form a paste that hardens and bonds the aggregates together. Concrete is often looked upon as “man made rock”. Concrete is the most widely used construction material … Read more

Grading Of Aggregates for Concrete

Grading of Aggregates

—Grading Of Aggregates for Concrete Aggregate comprises about 85 % volume of mass concrete— —Concrete contains aggregate upto a maximum size of 150 mm ——Way particles of aggregate fit together in the mix, as influenced by the gradation, shape, and surface texture— —Grading effects workability and finishing characteristic of fresh concrete, consequently  the properties of … Read more

USBR Method

High Performance Concrete

USBR Method of Concrete Mix Proportioning Principle In this method of mix design, the water content of air entrained concrete and the proportions of fine and coarse aggregates are determined for a fixed workability and grade of fine aggregates.   Procedure of mix proportion Table 1 recommends maximum slump for various types of concrete construction … Read more

Steps Involved in Mix Proportioning as per IS 10262:2009 (with solved example)

Mix Proportioning as per IS 10262:2009

Steps Involved in Mix Proportioning as per IS 10262:2009 (with solved example)   General Steps Involved in Mix Proportioning Step 1. Choice of Slump Stiffest possible consistency that can be easily placed and compacted without segregation Pumping are typically designed for 100 mm to 150 mm slump Step 2. Choice of Max. Size of Aggregate … Read more

IS Codes Used In Mix Proportioning & their Uses

IS Codes Used In Mix Proportioning IS 456 : 2000 Code of Practice for Plain & Reinforced Concrete Exposure Conditions Table 5 – Minimum Cement Content & Max. w/c ratio IS 10262: 2009 Mix Proportioning – Guidelines Table 1 – Standard Deviation Table 2 – Max. Water Content Table 3 – Vol. fraction of Coarse … Read more

General Considerations for Workability of Concrete

workability of concrete

General Considerations for Workability of Concrete Workability Workability represents consistency & cohesiveness of concrete General Considerations for Workability Water content The higher the water content, the higher will be the fluidity of concrete, which is one of the important factors affecting workability. a/c Ratio The higher the aggregate/cement ratio, the leaner is the concrete In … Read more