Month: July 2022

Typical Bridge Load test to evaluate the load carrying capacity of bridges

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 1. INTRODUCTION Evaluation test for load carrying capacity of bridge will be useful to assess the effects of defects or deterioration on the overall performance of the bridge or on the stresses in individual components. This note presents a procedure for assessing the safe load carrying capacity of single span PSC box girder Major Bridge …

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Non Destructive testing by Schmidt Hammer as per provisions of IS: 13311 – 1992

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Introduction (Schmidt Hammer): This is a simple, handy tool, which can be used to provide a convenient and rapid indication of the compressive strength of concrete. It consists of a spring controlled mass that slides on a plunger within a tubular housing. The schematic diagram showing various parts of a rebound hammer is given as …

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SOME SIMPLE LABORATORY TESTS OF BRICKS FOR QUALITY CHECK FOR CONSTRUCTION USES

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 (a) Water absorption test (as per IS: 3495, Part-2, 1992): Water absorption value of bricks largely influences the bond between brick and mortar. If water absorption in bricks is more and bricks are not soaked before the masonry work, the water from freshly laid mortar is likely to be absorbed by bricks. This results into …

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DETERMINATION OF BULKING OF SAND AND ITS EFFECTS & CALCULATION (As per IS 2386, Part-III)

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Bulking of sand Moist sand occupies larger volume if loosely filled in, than dry sand. Due to moisture, thin film  of water forms around sand grain which results in increase of volume. This effect of increase in volume (if loosely filled in) due to moisture content is called “Bulking of sand”. The bulking of sand …

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LABORATORY DETERMINATION OF CBR VALUE OF SOIL (AS PER IS-2720-PART-16-1987)

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Hammers Proving ring apparatus Surcharge Dial gauges Apparatus for CBR testing method Objective Determination of CBR value for soil samples under standard test procedure. Apparatus Compression machine i. Mould of 150mm dia and 175mm height with base plate, stay rod and wing nut ii. Collar of 50mm height, detachable perforated base iii. Spacer disc iv. …

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DETERMINATION OF FIELD DENSITY OF SOIL BY SAND REPLACEMENT METHOD

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 DETERMINATION OF FIELD DENSITY OF SOIL BY SAND REPLACEMENT METHOD (As per IS-2720-Part-28) Calibrating can Sand pouring cylinder Tray Sand Replacement test apparatus A pit of specified dimensions is excavated in the ground. The mass of the excavated soil is determined. The volume of the hole is determined by filling it with clean, uniform sand …

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BITUMINOUS MIX DESIGN BY MARSHALL METHOD (As per ASTM D 1559 – 62 T )

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BITUMINOUS MIX DESIGN BY MARSHALL METHOD (As per ASTM D 1559 – 62 T ) Introduction One of the method of designing of bituminous mix is Marshall Method. Objective To determine the stability and flow properties of bituminous mixes and to design the mix at optimum bitumen content. Apparatus used i) I.S sieve ii) Weighing …

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DISCUSSION ON GRAIN SIZE ANALYSIS OF SOIL

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 DISCUSSION ON GRAIN SIZE ANALYSIS OF SOIL The commonly used properties for the classification are the grain size distribution, liquid limit and plasticity index. Those properties have also been used in empirical design methods for flexible pavements and in deciding the suitability of sub grade soil. The results of the test are of great value …

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