22/12/2021
Did you know the differences between OPC & SRC before?
OPC (Ordinary Portland Cement)
OPC is manufactured by grinding together OPC Clinker (95 - 97%) along with gypsum (3-5%). Ordinary Portland Cement (OPC) is graded according to their compressive strength. The grade indicates the minimum compression strength (MPa or N/mm2) of the cement that will attain after 28 days of setting.
Uses & Application:
53 Grade OPC cement is Used in RCC, high strength pre-cast and pre-stressed concrete, concrete of higher grades, etc. where ever initial higher strength is the major structural requirement. 43 Grade OPC Cement are commonly used for plastering & masonry works, Non-RCC structures, pathways etc. where initial days strength is not of prime importance. Even high strength pre-cast and pre-stressed concrete.
Compression Strength:
OPC 43 Grade cement attains minimum compression strength of 43 MPa in 28 days of setting compared to 53 attained by 53 Grade cement.
Initial Strength:
53 Grade cement are used for fast-paced construction were initial strength is to be achieved rapidly. 53 Grade cement has fast setting compared to 43 grade cement. 53 Grade attains a minimum strength of 27 MPa in 3 days compared to only 23 MPa by a 43-grade cement.
VS.
SRC (Sulphate Resisting Cement)
Sulphate Resisting Cement is also a type of Portland cement in which the amount of Tricalcium aluminate (C3A) is restricted to lower than 5 % and (2 C3A + C4AF) is lower than 25%.
SRC can be used for structural concrete wherever OPC or PPC or Slag Cement is usable under normal conditions.
The use of SRC is particularly beneficial in such exposure/service conditions, where the concrete is exposed to the risk of deterioration due to sulphate attack. The use of SRC is recommended for the following applications:
Foundations, piles, basements and underground structures.
In above, Structural concrete is prone to sulphate attack which can be external or internal in nature
External: via pe*******on of sulfates in solution (sulphate concentrated groundwater, seawater), into the concrete from outside, same case with sewage treatment plant as they carry sewage (bacterial action in sewers - anaerobic bacterial produce SiO2 which dissolves in water and then oxidizes to form sulfuric acid).
Internal: via soluble source being incorporated into the concrete at the time of mixing like sulfate-rich aggregate, excess of added gypsum in the cement, or contamination.
Above exposure /service life conditions, Ordinary Portland Cement will not perform satisfactorily, as concrete made with OPC (C3A in the range of 5 – 8 %) will expand extensively and crack, loss of strength due to sulphate attack, may have catastrophic effect on structures.
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