Minimizing water and cement requirements in Concrete

Minimizing water and cement requirements in Concrete Goals of Determining the proper mix To determine the most economical and practical combination of readily available materials. To produce a concrete that will meet requirements under specific conditions of use. The majority of concrete used for agricultural applications is supplied by ready-mix producers. With an understanding of … Read more

Curing of Concrete and General Methods of Curing

Curing the concrete roof slab

Curing of Concrete and General Methods of Curing Concrete that has been specified, batched, mixed, placed, and finished “letter-perfect” can still be a failure if improperly or inadequately cured. Curing is usually the last step in a concrete project and, unfortunately, is often neglected even by professionals. Curing has a major influence on the properties … Read more

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

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

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

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