What is elongation index of course aggregates? Elongation index of an aggregate is the percentage by weight of particles whose greatest dimension (length) is greater than one and four-fifth times their mean dimension. It is measured on particles passing through mesh size of 63mm and retained on mesh size of 6.3mm. Determination of elongation index(…)
Tests on Aggregate
TESTING OF SAND QUALITY FOR CONSTRUCTION AT SITE
Aggregate most of which pass through 4.75 mm IS sieve is known as fine aggregate. Fine aggregate shall consists of natural sand, crushed stone sand, crushed gravel sand stone dust or arable dust, fly ash and broken brick (burnt clay). It shall be hard, durable, chemically inert, clean and free from adherent coatings, organic matter(…)
PROPERTIES OF AGGREGATES
1. AGGREGATES: BULK DENSITY, SPECIFIC GRAVITY AND VOIDS BULK DENSITY River sand Fine 1.44 Medium 1.52 Coarse 1.60 Beach or river shingle 1.60 Broken stone 1.60 Stone screenings 1.44 Broken Granite 1.68 SPECIFIC GRAVITY Trap 2.9 Granite 2.8 Gravel 2.66 Sand 2.65 VOIDS,(…)
GRADING LIMITS FOR AGGREGATES
GRADING LIMIT FOR SINGLE – SIZED AGGREGATES (Clause 4.1 and 4.2 of IS: 383- 1970) IS Sieve Percentage passing for single sized aggregates of nominal size(mm) 63 mm 40 mm 20 mm 16 mm 12.5 mm 10 mm 80 mm 100 – - – - – 63 mm 85 – 100 100 – - -(…)
GRAIN SIZE ANALYSIS
AIM To determine the particle size distribution of the given fine aggregate and to determine ,the fineness modulus,the effective size and uniformly coefficent . THEORY Fine aggregate is the sand used in mortars. Coarse aggregate is the broken stone used in concrete .The coarse aggregate unless mixed with fine aggregate serves no purpose in cement(…)
BULKING OF FINE AGGREGATE
AIM To study the behaviour of sand grains under varying percentage of moisture content . APPARATUES. 250 ml measuring cylinder ,weighing balance etc . PROCEDURE (i) Take 500gm (W1) of the aggregate. (ii) Keep the sample in an oven in a tray at a temperature of 100°C-110° C for 24 ± 0.5 hours . (iii)(…)
BULK DENSITY AND PERCENTAGE VOIDS OF AGGREGATES
Aim To determine the bulk density and percentage voids of aggregate . Apparatus (I)Balance -A balance sensitive to 0.5% of the weight of the sample to be weighed . (ii) Cylindrical Metal Measure- The measure shall be of 3,15 or 30 liters capacity and shall comply with the requirements given below. . . . Size(…)
SPECIFIC GRAVITY OF FINE AND CORSE AGGREGATES
AIM To determine the specific gravity of given sample of fine and coarse aggregates. SPECIFIC GRAVITTY OF COARSE AGGREGATE. Apparatus A balance or scale of capacity not less than 3 kg, readable and accurate to 0.5 g and of such a type and shape as to permit the basket containing the sample to be(…)
1 2