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Production and Utilization of Retarder from Hardwood Sawdust

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Production and Utilization of Retarder from Hardwood Sawdust


Nay Myo Kyaw Thu | Swe Swe Khaing



Nay Myo Kyaw Thu | Swe Swe Khaing "Production and Utilization of Retarder from Hardwood Sawdust" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5, August 2019, pp.1971-1978, URL: https://www.ijtsrd.com/papers/ijtsrd27911.pdf

In this study, production of retarding admixture (ASTM C494 Type-B) from hardwood sawdust and utilization on concrete by using various dosage of admixture was studied. In production of retarder as a local product lignosulphonates based retarding admixture was produced to investigate differences of test results by using admixtures. In this project, selected raw material was Pyin-Ka-do sawdust and sodium sulphite (Na2SO3) was used as a cooking aid chemical liquor by heating at 110°C based on pulp and paper sulphite process. The mechanisms of action of lignosulphonate admixture in cement-water systems are prescribed by five different types interaction between retarder and cement grains : (i) Reduction in surface tension of water (ii) Adsorption (iii) Electrical repulsion (iv)Dispersion and (v) Deflocculation. These reactions cause delaying in setting time.In utilization of retarder on concrete, setting time of hydraulic cement paste, compressive strength of mortar and concrete were considered by using produced admixture dosage of (0.5%, 1%, 1.5%) by weight of cement. The setting time testing of cement paste was made by using vicat needle penetration test, and compressive strength was tested with standard cubes. The test results of produced admixture were compared with ASTM C494 (1993). Compressive strength of mortar was tested with 3 inches cube and that of concrete was tested by 6 inches standard cube. For comparison of cost and results of produced admixture, commercial admixture (0.5% by weight of cement) was tested.

compressive strength, setting time, lignosulphonate, retarder, admixture


IJTSRD27911
Volume-3 | Issue-5, August 2019
1971-1978
IJTSRD | www.ijtsrd.com | E-ISSN 2456-6470
Copyright © 2019 by author(s) and International Journal of Trend in Scientific Research and Development Journal. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0) (http://creativecommons.org/licenses/by/4.0)

International Journal of Trend in Scientific Research and Development - IJTSRD having online ISSN 2456-6470. IJTSRD is a leading Open Access, Peer-Reviewed International Journal which provides rapid publication of your research articles and aims to promote the theory and practice along with knowledge sharing between researchers, developers, engineers, students, and practitioners working in and around the world in many areas like Sciences, Technology, Innovation, Engineering, Agriculture, Management and many more and it is recommended by all Universities, review articles and short communications in all subjects. IJTSRD running an International Journal who are proving quality publication of peer reviewed and refereed international journals from diverse fields that emphasizes new research, development and their applications. IJTSRD provides an online access to exchange your research work, technical notes & surveying results among professionals throughout the world in e-journals. IJTSRD is a fastest growing and dynamic professional organization. The aim of this organization is to provide access not only to world class research resources, but through its professionals aim to bring in a significant transformation in the real of open access journals and online publishing.

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