Boundary Layer Equations and Different Boundary Layer Thickness

boundary layer

Boundary Layer Equations and Different Boundary Layer Thickness Topics Covered Different Boundary Layer Thickness Nominal Thickness Displacement Thickness Momentum Thickness Energy Thickness Equations for different BL thickness Boundary Layer Equations Assumptions Nominal Thickness Nominal thickness of the boundary layer is defined as the thickness of zone extending from solid boundary to a point where velocity … Read more

Financial Arrangements done after Bhuj Earthquake 2001

Bhuj Earthquake

Financial Arrangements done after Bhuj Earthquake 2001 Calamity Relief Fund (CRF) in each state. The CRF allocation during the period 2000-05 has been increased to Rs 11007.56 crore as compared with Rs 6304.27 crore during 1995-2000. The efforts are supplemented by provision of additional assistance from National Calamity Contingency Fund (NCCF) during severe calamities. Calamity … 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

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

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

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