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Krishnaraj, L.
- Investigation on the Compatibility of Cement Paste with SNF and PCE based Superplasticizers
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Authors
Affiliations
1 Department of Civil Engineering, SRM University, Kattankulathur - 603203, Tamil Nadu, IN
1 Department of Civil Engineering, SRM University, Kattankulathur - 603203, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 9, No 34 (2016), Pagination:Abstract
Background/Objectives: Cement particles disperse due to the flow character of the cement paste which also controls the quality of concrete. Cement particles also disperse due to the addition and action of Super-plasticizers (SPs) and this influences the high fluid paste behaviour. In the development of High Performance Concrete the Super-plasticizers and mineral admixtures such as fly ash plays an important role. SPs are normally adsorbed on the cement particles and sometimes the adsorption will not be even and slightly erratic. This is due to the clinker composition of cement and the type of SP used. Various combinations of materials including mineral admixtures affect the behaviour of the cement–based system and become incompatible like slump loss, delayed setting of concrete etc. Methods: In this study an attempt is made to explore maximum benefits of the compatibility between cement, Fly-ash and super-plasticizers (SP). The Flow table and marsh cone tests were conducted to determine the optimum dosage of the mixture. The different combination was tried in the cement mortar and the improvements in compressive strength were studied. Findings: Results show that the cement with 20% Fly-ash has the better compatibility with Poly carboxylate ether with optimum dosage of 0.9% by weight of cement. Improvement: The investigation shows that the polycarboxylate type superplasticizer has better compatibility with the different types of cement considered in this study.Keywords
Flyash, Flow Table, Marsh Cone, Poly Carboxylate Ether, Super-Plasticiser.- Effectiveness of Alkali Activators on Nano Structured Flyashin Geopolymer Mortar
Abstract Views :120 |
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Authors
Affiliations
1 Department of Civil Engineering, SRM University, Kattankulathur - 603203, Tamil Nadu, IN
1 Department of Civil Engineering, SRM University, Kattankulathur - 603203, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 9, No 33 (2016), Pagination:Abstract
Background/Objectives: The cement industry is seeking ways to reduce the energy resource consumption and environmental load due to cement production. The usage of Supplementary Cementitious Material (SCMs) as a partial replacement of ordinary Portland cement can reduce its environmental load as well as the reduction in construction cost. Methods: In this work it is intended to analyze the mortarcube compressive strength by replacing the cement by 50% of Raw Fly ash and Sieved fly ash, with silica 10, 30% with 12 M Sodium Hydroxide and with and without the addition of lime 10, 30% in one series. Similarly, another set of studied with the ratio of 1:2.5 Sodium Hydroxide 12 M and Sodium Silicate asalkali activators to know the characteristics of the modified mortar. The mortar specimens curedin oven for 24 hrs at 60°c and then left for air curing for predetermined ages at 3, 7, 14, 28 days of curing. The micro structural test was conducted to know their morphological characteristics, particle size and their chemical compositions of cement, Raw fly ash and Sieved fly ash. Findings: Results from the work showed that modified mortar prepared using Sieved fly ashgave 9% increase in compressive strength than RFA. The higher percentage of replacements oflime is observed to increase the strength of Sieved Fly Ash (SFA) mortars. SEM results show that SFA sample taken at different resolution indicate smallest particle size to be 106.4 nm, and EDX results show that reducing the particle size has reduced the carbon content by 10% improved the properties of fly ash. Application/Improvements: Use of sieved fly ash, increases the strength in geopolymer properties is more advantageous in the construction industry for utilizing the fly ash in largequantity and thereby reducing the use of cement content also minimize the CO2 emission during the production in the cement industry.Keywords
Alkali Activated Mortar, Compressive Strength, Nano Structure Materials, Oven Curing, Sieved Fly Ash- Investigation on Effectiveness of the Top Down Nanotechnology in Mechanical Activation of High Calcium Fly Ash in Mortar
Abstract Views :186 |
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Authors
Affiliations
1 Department of Civil Engineering, SRM University, Kattankulathur - 603203, Tamil Nadu, IN
2 Department of Civil Engineering, SRM University, Kattankulathur - 603203, Tamil Nadu
1 Department of Civil Engineering, SRM University, Kattankulathur - 603203, Tamil Nadu, IN
2 Department of Civil Engineering, SRM University, Kattankulathur - 603203, Tamil Nadu