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POTENTIAL REACTIVITY OF QUARTZITE AGGREGATES CONTAINING STRAINED QUARTZ

A K Mullick, Rajeev Wason, S. K. Sinha

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Abstract

Results of evaluation of natural aggregates which can be classified as slow/late expanding alkali-silica reactive rocks are presented. One common feature in these rocks was the presence of strained quartz; on the other hand, metastable silica minerals like opal or chalcedony etc, were not detected. Taking into account past service records, results of mortar-bar tests at 38 and 60 degrees C and rapid chemical tests up to 7 days, revised criteria for assessment of such aggregates are proposed. (A) For the covering abstract see IRRD 871351.

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What this paper is about

Results of evaluation of natural aggregates which can be classified as slow/late expanding alkali-silica reactive rocks are presented. One common feature in these rocks was the presence of strained quartz; on the other hand, metastable silica minerals like opal or chalcedony etc, were not detected. Taking into account past service records, results of mortar-bar tests at 38 and 60 degrees C and rapid chemical tests up to 7 days, revised criteria for assessment of such aggregates are proposed. (A) For the covering abstract see IRRD 871351.

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Available abstract

Results of evaluation of natural aggregates which can be classified as slow/late expanding alkali-silica reactive rocks are presented. One common feature in these rocks was the presence of strained quartz; on the other hand, metastable silica minerals like opal or chalcedony etc, were not detected. Taking into account past service records, results of mortar-bar tests at 38 and 60 degrees C and rapid chemical tests up to 7 days, revised criteria for assessment of such aggregates are proposed. (A) For the covering abstract see IRRD 871351.

Key concepts: Chalcedony, Quartz, Mineralogy, Mortar, Metastability, Geology, Bar (unit), Feature (linguistics)

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