In our region, Curbstones shall only be precast from concrete mixture contain not less 400KG/m3 of sulphat Resisting Portland cement in which the compressive strength after 28 days should achieve minimum 45 N/mm2 and the concrete produced in a fully automatic batching plant and sampling shall be done and the materials (coarse and fine aggregate , cement and water) to be are selected in compliance with suitable international standard in order to specify suitable grading, ,fine aggregate % , coarse aggregate %, water absorption, specific gravity ,elongation index, soundness, Acid soluble upper range and lower range and the combined grading shall be within appropriate specified grading limits with Max. aggregate size of 20mm. We used to use of precast Curb rather than curber Machin's concrete and i believe that the main differences of the concrete mix in the two methods will be on the slump range and using different type of admixtures.
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Ashraf Amin A.M.ASCE
Chief Engineer for Roads and Infrastructure
RTA- Dubai
Dubai
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Original Message:
Sent: 02-06-2021 08:17 PM
From: Mohammed Al-Tofan
Subject: Precast Concrete Curbstone versus Curber Machine Mix Proportions
Does anyone have any information on the mix proportions and gravel size for the precast curbstone and how it differs from the curber machine's concrete?
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Mohammed Al-Tofan Ph.D., P.E., M.ASCE
West Columbia SC
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