Suitability of Egyptian ornamental stone calcite wastes as non-conventional aggregates in concrete

Gharieb, M; Ogala, Walid; Yahya, Ahmed; Gamal, Ahmed; Abd-EL-Raoof, Fawzia; Elsokkary, Tarek; Soltan, Abdel Monem

doi:10.21608/ejchem.2023.236544.8620

Suitability of Egyptian ornamental stone calcite wastes as non-conventional aggregates in concrete

Document Type : Original Article

Authors

¹ Housing &amp; Building National Research Center (HBRC), Egypt

² Geology Department, Faculty of Science, Ain Shams University

³ Applied mineralogy group - geology department - faculty of science - Ain shams University - Cairo - Egypt

⁴ 33 El Buhouth St.,Dokki, Giza , Egypt Postal Code 12622

⁵ Housing and Building National Research Center

⁶ Geology Department, Faculty of Science, Ain Shams University, Cairo 11566, Egypt

10.21608/ejchem.2023.236544.8620

Abstract

The objective of this study is to investigate how the use of ornamental stone calcitic wastes as aggregate affects the mechanical properties and durability of concrete when exposed to high temperatures up to 600ºC. The concrete compositions consisted of different types of coarse aggregates: dolomite (control), calcite, and granite. A super plasticizer (SP)-type (F) was employed to lower the water/cement ratio. The physical and mechanical properties of the raw aggregates were determined, and the same properties were analyzed for the various concrete types. The impact of fire exposure up to 600ºC on the mechanical properties and microstructures of the concrete was also investigated .The results indicated that concrete mixes composed of 50% dolomite and 50% calcite, as well as 75% dolomite and 25% granite aggregate, satisfy the compressive strength requirements for normal concrete after a 28-day. When compared to the control concrete (D100), the chloride ion migration coefficient and water penetration depth slightly increased in concrete containing granite and calcite waste aggregates. Subsequently, at exposure temperatures of 300ºC, 400ºC, and 600ºC, the compressive strength values of concrete mixes incorporating granite and calcite waste aggregates exhibited a slight decrease in comparison to the control concrete (D100).

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