Evaluation of Kiln Dust in Concrete


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Title: Evaluation of Kiln Dust in Concrete

Author(s): V. Ramakrishnan

Publication: Special Publication

Volume: 91


Appears on pages(s): 821-840

Keywords: blended cements; compressive strength; concretes; creep properties; dust; dust collectors; evaluation; kilns; setting (hardening); shrinkage; tensile strength; wastes.

Date: 2/1/1986

Dust collected from the hot exhaust gases emanating from the rotary kiln is known as cement kiln dust and presently it is considered as a solid waste material to be disposed of without polluting the environment. The composition of this dust is similar to that of cement kiln raw feed and often contains high concentration of alkalies. It contains partly calcined material and therefore it has some hydraulic and cementitious properties. This paper presents the results of a comparative study of the properties of concretes made with cement blended with kiln dust versus the properties of corresponding concretes made with plain Portland Cement. The blended cement was produced by blending 5% cement kiln dust with 95% by weight of regular Type I Portland Cement. Cement properties, mortar properties, fresh concrete properties, and hardened concrete properties like compressive strength, splitting tensile strength, flexural strength, impact strength, static modulus of elasticity, shrinkage, creep and creep recovery were studied using ASTM Test procedures. The result of the study showed that the addition of cement kiln dust slightly retards the setting time of cement and the fresh concrete properties of blended cement concrete mixes were almost the same as those of plain cement concrete mixes. B1ended cements did not adversely affect most of the hardened concrete properties.