REFERENCE IS-3952-1988-Specification for the burnt clay hollow bricks used for walls and partition Objective To determine the water absorption of burnt clay hollow bricks used for walls and partitions. Equipment Name Capacity Balance Sensitive to 0.1% of mass of specimen Oven 110 to 1150C Procedure Dry the specimen in an oven maintained at a … Read more
Bricks should be soaked in water before using it in any brick work. Soaking of bricks has the following advantages. Advantages Wetting of bricks removes any dirt, sand and dust from them. Soaked bricks prevents suction of water from the wet mortar. If dry bricks are used then it will absorb water from mortar and … Read more
Objective To determine the consistency of masonry mortar Apparatus Standard Cone Apparatus having following parts and dimensions Penetrating Cone Conical Container Weight = 300 g,Height = 150 mm, Base dia = 75 mm Top dia=150 mm,Height = 180 mm Tamping Rod Procedure Fill the conical container with the mortar to a level that is 1 … Read more
From durability point of view, the grade of masonry mortar to be used for a given work is primarily dependent upon the following two factors. Loading condition Exposure condition Considering the above two factors the suitable grade of masonry mortar to be used for different works is given in the following table. Generally cement mortar … Read more
Masonry mortars are specified as different grades depending upon their minimum compressive strength, when tested at an age of 28 days. Different grades of cement mortar and their mix proportions are given below. Different Grades of Cement Mortar Grade Name Mortar Mix (by Loose Volume) Compressive Strength at 28 days (in N/mm2) Cement Sand MM … Read more
Grading Limit of All in Aggregate Sieve Size Percentage of Passing For All-in-Aggregate 40 mm Nominal Size 20 mm Nominal Size 80 mm 100 – 40 mm 95 – 100 100 20 mm 45 – 75 95 – 100 4.75 mm 25 – 45 30 – 50 600 micron 8 – 30 10 – … Read more
The sand which is used in mortar can be natural sand, or crushed stone sand or crushed gravel sand. Sand or fine aggregate which is used in concrete is somewhat different from sand which is used for masonry mortar. The role of sand in mortar is to give the following properties such as Strength Workability … Read more
What is Fineness Modulus of Aggregate? Fineness modulus is an empirical factor obtained by adding the cumulative percentages of aggregate retained on each of the standard sieves ranging from 80 mm to 150 micron and dividing this sum by 100. Why to Determine Fineness Modulus? Fineness modulus is generally used to get an idea of … Read more
Reference IS: 650 – Standard sand for testing cement – specification Standard Sand Standard sand is used to assess the quality of cement, lime, pozzolana and other mineral admixture used in construction industry. Previously it was imported from U.K. Now it is available at Ennore, Madras. Characteristics Standard sand shall be of quartz material Colour … Read more
Rules of Thumb on Concrete Mix Adding 4 liters of water to 1 cubic meter of freshly mixed concrete will: Increase slump about 25 mm Decrease compressive strength about 1.5 to 2.0 N/mm2 Increase shrinkage potential about 10% Waste as much as ¼ bag of cement If Freshly Mixed Concrete Temperature Increases 1 degree Celsius: … Read more
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