Types of Portland cement and Uses

Types of Portland cement and Uses Portland cement was named for the Isle of Portland, a peninsula in the English Channel where it was first produced in the 1800’s. Since that time, a number of developments and improvements have been made in the production process and cement properties. The production process for portland cement first … Read more Types of Portland cement and Uses

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 What is Concrete and what are the Properties of Concrete

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 Grading Of Aggregates for Concrete

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 USBR Method

Types & Functions Of Bearings for Bridges

Pin Bearing

Types & Functions Of Bearings for Bridges Function Of Bearings Bridge bearings are used to transfer forces from the superstructure to the substructure, allowing the following types of movements of the superstructure: Translation movements; are displacements in vertical and horizontal directions due to in-plane or out-of-plane forces like wind and self weight. Rotational movements; cause … Read more Types & Functions Of Bearings for Bridges

What are the Selection Criteria for Bridge Site?

Selection Criteria For Bridge Site

Selection Criteria For Bridge Site The choice of the right site is a crucial decision in the planning and designing of a bridge. It may not be possible always to have a wide choice of sites for a bridge. This is particularly so in case of bridges in urban areas and flyovers. For river bridges … Read more What are the Selection Criteria for Bridge Site?

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

Factors affecting the choice of mix proportions

Factors affecting the choice of mix proportions

Factors affecting the choice of mix proportions   Factors affecting the choice of mix proportions Compressive strength Workability Durability Maximum nominal size of aggregate Fineness Modulus and zone of aggregate Quality Control Significance of Max. w/c Ratio & Min. Cement Content Water Cement Ratio Strength Criteria Durability Criteria Durability decreases with increase in w/c ratio … Read more Factors affecting the choice of mix proportions

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 IS Codes Used In Mix Proportioning & their Uses