Influence of nano silica and metakaolin admixed concretes of different grades on mechanical properties
By: Prabakar, J
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Publisher: Thane ACC LTD 2019Edition: Vol.93(06), June.Description: 27-36p.Subject(s): Civil EngineeringOnline resources: Click here
In:
Indian Concrete JournalSummary: Concrete is the most common durable material used in construction industry. Durability is an important parameter when structural reinforced concrete is used in harsh environments. The environmental factors such as weathering action, chemical attack, abrasion and other deterioration process may change the properties of reinforced concrete with time. The degrees of deterioration occurs is mainly due to the presence of pore size in the concrete. Concrete with Supplementary Cementitious Material (SCM) like Metakaolin (MK) and Nano Silica (NS) will help in producing the concrete with a dense microstructure, which will decrease the voids in concrete. Experimental study was carried to study the effect of Metakaolin in M25 and M50 grade concretes by replacement of cement by weight at different proportions like 0%, 5%, 10%, 15%, 20%. Further, the influence of Nano Silica was studied in these concretes by adding 0.5%, 1%, 1.5% and 2% by weight of cementitious materials. Increase in compressive strength of 44.4% and 26 % for the corresponding control concrete of M25 and M50 grades respectively was observed maximum with 10 % replacement level of Metakaolin by weight of cement. Addition of 1.5% Nano Silica in M25 grade concrete showed higher strength which is 74% higher than the control concrete. In M50 grade concrete the maximum strength was observed with the addition of 2.0 % of Nano Silica which showed 48 % higher than the control concrete. Combination of the optimum percentage of MK and NS addition show good enhancement in the mechanical properties when compared to control and MK based concrete but slight marginal decrease when compared to NS based concrete for both the grades.
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School of Engineering & Technology (PG) Archieval Section | Not for loan | 2019789 |
Concrete is the most common durable material used in construction industry. Durability is an important parameter when structural reinforced concrete is used in harsh environments. The environmental factors such as weathering action, chemical attack, abrasion and other deterioration process may change the properties of reinforced concrete with time. The degrees of deterioration occurs is mainly due to the presence of pore size in the concrete. Concrete with Supplementary Cementitious Material (SCM) like Metakaolin (MK) and Nano Silica (NS) will help in producing the concrete with a dense microstructure, which will decrease the voids in concrete. Experimental study was carried to study the effect of Metakaolin in M25 and M50 grade concretes by replacement of cement by weight at different proportions like 0%, 5%, 10%, 15%, 20%. Further, the influence of Nano Silica was studied in these concretes by adding 0.5%, 1%, 1.5% and 2% by weight of cementitious materials. Increase in compressive strength of 44.4% and 26 % for the corresponding control concrete of M25 and M50 grades respectively was observed maximum with 10 % replacement level of Metakaolin by weight of cement. Addition of 1.5% Nano Silica in M25 grade concrete showed higher strength which is 74% higher than the control concrete. In M50 grade concrete the maximum strength was observed with the addition of 2.0 % of Nano Silica which showed 48 % higher than the control concrete. Combination of the optimum percentage of MK and NS addition show good enhancement in the mechanical properties when compared to control and MK based concrete but slight marginal decrease when compared to NS based concrete for both the grades.
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