They look almost the same as the igneous rock aggregates, but they have more white powder on the surface and more slippery. No wonder they failed the skidding resistance tests and not recommended for road wearing course. Limestone also reacts with acid and is therefore not recommended for foundation, sub-structures and concrete surfaces that are exposed to acid or acidic rain.
Limestone aggregates available in Kuching are mostly from Bau or 21st Mile or 29th Mile Kuching-Serian Road Quarries.
It costed about RM50 per ton in the retail market, delivered to my home. I bought 3 tons for my home landscaping two months back.
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