The cement type affects the concrete strength and durability
Dear Dr Saleh,
The effect of types of cement on durability of concrete is associated with the sulfate anions on concrete deterioration due to sulfate attack and the role of chloride ions on sulfate attack in plain and blended cements.
Regards
Dear Dr. Saleh,
Following are the possible answers to your query;
i) Higher the grade of the cement more will be the strength of concrete. For example, M43 grade Portland cement is used for productions of M40 grade concrete members. Similarly, M30 grade Portland cement is used for productions of M30 grade concrete.
ii) There are various types of cements based upon the type of application such as a)Ordinary Portland cement (OPC) b) Portland Pozzolana Cement (PPC), c) High Alumina cement d) sulphate rich cement etc . The difference between all these types of cements is the rate of hydration and point of application. For example, high alumina cement would provide strength in lesser time as compared to OPC cement, similarly, PPC has tendency to provide strength at later days of curing. Sulphate rich cement is generally used for areas prone to sulphate attack.Moreover, PPC have the tendency to convert calcium hydroxide to calcium silicate hydrate gel which provides more strength and better resistance to environment attacks owing to concentration of less permeable voids.
iii) Higher the compression strength of concrete, more will be the resistance to abrasion. Such as in case of highways, OPC 43 is used as it is expected to produce M40 grade pavement which is the minimum strength to provide resistance to abrasion loss.
Dear Drs., Doha M Al Saffar & Surender Singh
Thank you so much for your interesting and valuable comments.
From my point of view, the chemical resistance of cement concrete against aggressive ions depends to a great extent on the type and proportion of cement. OPC, Pozzolana and sulfate resisting cement are the various types mainly used in marine constructions. Various researchers assessed the performance of these cements individually by either exposing the mortar and concrete specimens to seawater or in its constituent salt solution, to study their durability performance and strength properties.
I completely agree with the that, the effect of types of cement on durability of concrete is associated with the sulfate anions on concrete deterioration due to sulfate attack and the role of chloride ions on sulfate attack in plain and blended cements.
Strength and durability properties of cement mortar and concrete depends upon envionmental condition if cement species are in sea water than ions of salt may replace the calcium or silicate ion from C-S-H phase and converted into low dense material. This is also depends upon type of ions specially for isostructural ions, isoelectronic ions and size of ions as well as mobility of ions. Example carbonate and chromate ions may replace the silcate ion during hydration but after hydration the exchange of ions would be slow. Thus use of water and atmospheric composition may influence durabilty and strength of species during intial hydration.
the effect of types of cement on durability of concrete is associated with the sulfate anions on concrete deterioration due to sulfate attack and the role of chloride ions on sulfate attack in plain and blended cements.
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