1. Introduction
Concrete is made of cement sand and suitable aggregate, and it may be converted into p recast masonry unit or concrete masonry unit or CMU such as hollow and solid normal, light and denser weight concrete block of suitable size used for load bearing and non load bearing units for house construction, retaining wall security barriers etc.,
concrete masonry unit in short form represented as CMU made of concrete, mixture of cement, sand and water. There is a form of concrete masonry unit concrete block, concrete bricks, hollow concrete block, solid concrete block, lintel block, concrete stretcher block, concrete pillar blocks, partition concrete block, corner concrete block, concrete pillar block. Concrete block serve as economic building material, using in those regions where wall bricks are costly, poor in strength and not available.
There is a wide range of Construction application for many types of Residential, Public and industrial building. Due to sturdy and long-lasting building material, architect and Engineer will recommend for house construction, retaining wall, security barriers etc., and this is the best choice.
Compressive strength of concrete block is tested by compressive testing machine commonly known as CTM machine by taking full size of 8 blocks.
What is the compressive strength of concrete block in N/mm2 and Kg/cm2
Compressive strength of concrete block as IS code:- As per IS : 2185 (Part I) 1979, the min. average (of 8 samples) compressive strength is 5 Mph, with individual value not lesser than 4 Mph and As per IS : 2185 (Part II) 1983, (Light Wt.) the min. average (of 8 samples) compressive strength is 12.5 Mph, with individual value not lesser than 10.8 MPA Strength of concrete block depend on the mix proportions of concrete, properties of ingredients of concrete, curing period, its physical dimension and how it is loaded (flat or on edge), solid or hollow, wall thickness and height (slenderness ratio), unsupported (lateral) length of wall, no. of openings, grove cuttings (electric conduits and plumbing works), type of mortar and masonry bond type.
There are different types, shape, full & half size of concrete blocks, it may be hollow, solid, ultra low density, light weight, normal and medium dense, denser, load bearing or non load bearing concrete block or CMU unit, depending on their nature, on average compressive strength of concrete block/ Cinder block or CMU is varied between 3.5 N/mm2 to 17.5 N/mm2 or 35 kg/cm2 to 175 kg/cm2. For ultra low density weight concrete block, non load bearing, hollow or solid, their compressive strength is about 3.5 N/mm2 or 35 kg/cm2.
For lightweight concrete block, non load bearing, hollow or solid, their compressive strength is about 7.5 N/mm2 or 75 kg/cm2. For normal, medium weight concrete block, load bearing, hollow or solid, their compressive strength is about 12.5 N/mm2 or 125 kg/cm2.
For denser, higher weight concrete block, load bearing, hollow or solid, their compressive strength is about 17.5 N/mm2 or 175 kg/cm2. Full & half size of concrete blocks, it may be hollow, solid, ultra low density, light weight, normal and medium dense, denser, load bearing or non load bearing concrete block or CMU unit, on average, compressive strength of concrete block is vary between 7.5 N/mm2 to 12.5 N/mm2 or 75 kg/cm2 to 125 kg/cm2, for non load bearing structure, their compressive strength is 7.5 N/mm2 or 75 kg/cm2 and for load bearing structure, their compressive strength is 12.5 N/mm2 or 125 kg/cm2.
Calculations of Compressive Strength
Check Compressive Strength of Concrete
Size of the concrete cube = 15 cm x 15 cm x 15 cm
Area of the cube sample =225 cm2 (22500 mm2)
The same calculation should be done for 28 days compressive strength
The maximum load applied or load at failure of cube = 400 KN (400×1000 N)
Compressive strength = (Load in N/ Area in mm2)=400×1000/22500 N/mm2
= 17.77 N/mm2
Conclusion:-
● For ultra low density hollow or solid, non load bearing concrete blocks, their minimum compressive strength is 3.5 N/mm2 or 35 kg/cm2.
● For denser, higher weight, hollow or solid, load bearing concrete blocks, their maximum compressive strength is 17.5 N/mm2 or 175 kg/cm2.
● For normal, medium weight, hollow or solid, load bearing concrete blocks, their compressive strength is 12.5 N/mm2 or 125 kg/cm2.
● For normal, medium weight, hollow or solid, concrete blocks, on average, their standard compressive strength is varied between 7.5 N/mm2 to 12.5 N/mm2 or 75 kg/cm2 to 125 kg/cm2.
● For normal, medium weight, hollow or solid, concrete blocks, on average, their standard compressive strength is very between 7.5 N/mm2 to 12.5 N/mm2 or 75 kg/cm2 to 125 kg/cm2.
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