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
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