scholarly journals Performance of Periwinkle Shell Ash Blended Cement Concrete Exposed to Magnesium Sulphate

2013 ◽  
Vol 15 (2) ◽  
Author(s):  
Umoh A.A. ◽  
Olusola K.O.
Keyword(s):  
Magnesium Sulphate ◽  
Blended Cement ◽  
Cement Concrete ◽  
Periwinkle Shell

scholarly journals Improving the strength performance of high volume periwinkle shell ash blended cement concrete with sodium nitrate as accelerator

2015 ◽  
Vol 6 (2) ◽  
pp. 18-22 ◽  
Author(s):  
Akaninyene A. Umoh ◽  
Anthony O. Ujene
Keyword(s):  
Tensile Strength ◽  
Sodium Nitrate ◽  
Blended Cement ◽  
High Volume ◽  
Strength Properties ◽  
Splitting Tensile Strength ◽  
Cement Concrete ◽  
Strength Performance ◽  
Binder Ratio ◽  
Periwinkle Shell

 The objective of this study is to examine the effect of accelerator (NaNO3) on the strength properties of High volume Periwinkle shell ash blended cement concrete. A mix ratio and water-binder ratio of 1:2:4 (cement: sand: gravel) and 0.60, respectively was used as the reference. The cement was then replaced with 30% Periwinkle Shell Ash (PSA) by weight of cement. Sodium nitrate in the dosages of 1, 2, and 3% by weight of cement was added to the blended mixture of cement and PSA. The strength properties investigated were compressive and splitting tensile strength tested at 7, 14 and 28 days hydration. The results indicated that the compressive strength and the splitting tensile strength generally increases with curing age, and that sodium nitrate of up to 2% dosage greatly improved the strength performance of high volume PSA blended cement concrete over that of the reference. The study concluded that the inclusion of 2% sodium nitrate by weight of cement in the mixture could be considered the optimum dosage for the improvement of both compressive and splitting tensile strength of concrete incorporating up to 30% PSA content.

Corrosion Resistance Performance of Ethylamines in Fly Ash Blended Cement Concrete

2014 ◽  
Vol 507 ◽  
pp. 286-290
Author(s):  
V. Rajkumar
Keyword(s):  
Corrosion Resistance ◽  
Fly Ash ◽  
Blended Cement ◽  
Impedance Measurement ◽  
Chloride Ions ◽  
Experimental Investigations ◽  
Optimal Dosage ◽  
Cement Concrete ◽  
Chloride Permeability ◽  
Resistance Performance

The main aim of this investigation is to study the influence of monoethylamine, diethylamine and triethylamine inhibitors on the corrosion resistance performance of 25% fly ash blended cement concrete. These inhibitors were added in dosages of 1%, 2%, 3% and 4% by weight of cement and experimental investigations have been carried out to compare the effectiveness of these three inhibitors with regard to strength and corrosion resistance. The mechanical strength properties studied were compressive, split tensile, flexural and bond strengths. The resistance to corrosion was evaluated based on the performance of the concrete for the penetration of chloride ions by means of impressed voltage technique, Rapid chloride permeability test (RCPT), AC impedance measurement, and weight loss measurement and ultimately the most effective of the three inhibitors and its optimal dosage has been determined.

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