WHAT IS NON-DESTRUCTIVE TESTING OF CONCRETE & VARIOUS NDT TEST METHODS?

NDT test on concrete

Non-Destructive Testing of Concrete (NDT on Concrete) Non destructive test is a method of testing existing concrete structures to assess the strength and durability of concrete structure. In the non destructive method of testing, without loading the specimen to failure (i.e. without destructing the concrete) we can measure strength of concrete. Now days this method … Read more

HOW TO PERFORM PLATE LOAD TEST OF SOIL ON SITE?

Fig-1 (Plate Load Test Setup)

Objective To perform plate load test to obtain a load-settlement curve of a soil at a particular depth so as to estimate the ultimate bearing capacity a foundation. Apparatus Test plate of square size (300 mm or 450 mm or 600 mm or 750 mm) Hydraulic jack (50 T capacity) Hydraulic pump (50 T capacity) … Read more

HOW TO CALCULATE SAFE BEARING CAPACITY OF SOIL ON SITE?

How to calculate safe bearing capacity of soil on site

This simple and quick field test will give you a rough idea of bearing capacity of soil. Procedure Excavate a pit of required depth. (preferably equal to the depth of foundation) Take a solid ball or square cube of known weight and dimension. Drop the ball or square cube several times, from a known height … Read more

HOW TO FIND VOLUME OF CONCRETE PER BATCH?

volume of concrete per batch

Aim To determine volume of concrete per batch, where nominal maximum size of aggregate does not exceed 38 mm. Apparatus Balance – Sensitive to 0.01 kg Tamping bar – Length 38 cm, Weight 1.8 kg Cylindrical mould – Dia = 250 mm, Height = 280 mm, Capacity = 0.01m3 Step by Step Procedure to Calculate … Read more

SLUMP & COMPACTION FATOR – WHAT IS THE RELATION BETWEEN THEM?

How to manage slump loss in concrete

Generally we specify workability of concrete in terms of its slump test value. But sometimes it is also specified by another test called compaction factor. The relation between slump and compaction factor is roughly as follows. Relation Between Slump & Compaction factor Workability Slump in mm Compaction factor Very stiff – 0.70 Stiff 0 to … Read more

FLOW TABLE TEST TO MEASURE FLOW VALUE OF CONCRETE

Objective To measure flow value of concrete using flow table apparatus Equipment Flow table Slump cone shaped mould Wooden tamping bar   Procedure Place the flow table on a leveled surface Clean the top of the table and inner surface of the mould using a damp cloth. Place the slump cone centrally on the table. … Read more

WHAT ARE THE ADVANTAGES AND LIMITATIONS OF SLUMP TEST?

Advantages of Slump Test It grants the facility to easily detect the difference in water content of successive batches of concrete of the same identical mix. The apparatus is cheap, portable and convenient to be used at site. Limitation of Slump Test As such, there is no direct relationship between the workability and the value … Read more