Effect of High Free Lime Content in Fly Ash on Cementitious Properties and Autogenous and Drying Shrinkages of Fly Ash Mixtures
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Abstract
This paper aims to study the effect of high free lime content in fly ash on the cementitious properties and autogenous and drying shrinkages of fly ash mortars. Three original fly ashes with different free lime content were used. The addition of free lime powder to those original fly ashes was applied for making 5% and 10% of free lime contents. The replacement ratios of fly ash in ordinary Portland cement (OPC) were 20% and 40%. The cementitious properties, autogenous shrinkages of mortar and drying shrinkage of mortar were studied. The study found that pastes with high free lime content of fly ash results in higher normal consistency, earlier setting time and higher compressive strength at early age. Moreover, the autogenous and drying shrinkages of fly ash mortars for both high and low free lime contents are lower than those of OPC mortar. The additions of free lime in fly ash without exceeding 5% content do not affect the autogenous and drying shrinkages of mortars.
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References
Tangtermsirikul S. and Bumrungwong C, Conceptual Model for Determining Optimum Proportion of Fly Ash in Sulfate resisting Concrete, Proceedings of the 3rd National Convention on Civil Engineering, Thailand, January, 1997, pp. MAT 4-1 to 4-9.
Songpiriyakij S. and Jaturapitakkul C., A Study of Ground Mae Moh Fly Ash as a Pozzolan for Increasing Concrete Strength, KMITT Research and Development Journal, Vol. 18, No. 2.
pp.52-64, 1995.
Kaittikomol K., Jaturapitakkul C., siripanichgorn A., Nimityongskul P., Chindaprasirt P. and
Tangsathitkulchai C., Influence f Fineness of Classified Fly Ash on Compressive Strength and Sulfuric Acid Attack of Mortar,Proceedings of the 3rd National Convention on
Civil Engineering, Thailand, January, 1997,pp. MAT 2-1 to 2-10.
Chindaprasirt P., Meatanan S., Mangmeesri S., and Sinsiri T., Properties of Compacted Concrete Containing Fly Ash and Black Rice Husk Ash,Proceedings of the 6th National Convention on Civil Engineering, Thailand, January, 2000,pp. MAT- 47 to -57.
Krittiya Kaewmanee, Pitisan Krammart, Taweechai Sumranwanich, Pongsak Choktaweekarn and Somnuk tangtermsirikul, 2013. Effect of free lime content on properties of cement – fly ash mixtures. Construction and Building materials,38:829-836.
ปริญญา จินดาประเสริฐ และ ชัย จาตุรพิทักษ์กุล, 2555. ปูนซีเมนต์ ปอซโซลาน และคอนกรีต. 1500. 7.
สมาคมคอนกรีตแห่งประเทศไทย.