Document Type

Concrete and geopolymer materials paper

Publication details

Benn, BT, Baweja, D & Mills, JE 2014, 'The compressive strength of mortar made with cement containing limestone mineral addition, cement kiln dust and fly ash', in ST Smith (ed.), 23rd Australasian Conference on the Mechanics of Structures and Materials (ACMSM23), vol. I, Byron Bay, NSW, 9-12 December, Southern Cross University, Lismore, NSW, pp. 119-124. ISBN: 9780994152008.

Peer Reviewed

Peer-Reviewed

Abstract

This paper presents the findings, related to the effect of limestone mineral addition, cement kiln dust, fly ash and combinations of these materials, on the 28-day compressive strength of mortar specimens tested during the initial phase of a comprehensive research program. The main thrust of the research is to determine what effect increased levels of limestone mineral addition, when used in conjunction with cement kiln dust, will have on the chloride ion ingress of mortar/concrete. The mortars were manufactured to a constant water/binder ratio and cured under water until crushed. The results indicated that intergrinding the limestone is more effective than post blending the limestone, due to finer grinding and formation of nucleation points. The addition of up to 5% cement kiln dust did not adversely affect the compressive strength of cement only mixes. In mixes made with 20% and 30% fly ash replacement of cement, the use of limestone mineral addition and/or cement kiln dust appeared to improve the activation of the fly ash, as compressive strengths were all greater than the control mix at 28-days, with the total binder level and water/binder ratio being equal in all mixes. The compressive strength results of this phase have indicated that the use of increased levels of limestone mineral addition in cement will not be detrimental to the strength development of mortar or concrete.

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