Civil Engineering Association

Mnufactured sand. Abrasion resistance and effect of manufactured sand on concrete mortar

Cement Concrete & Aggregates Australia (CCAA) through its Manufactured Sand Subcommittee commenced research in 2004 to support the specification and use of manufactured sands. The first stage examined the physical and mineralogical properties of 21 samples of manufactured sand currently in production on the east coast of Australia. The samples chosen represented a range of rock types, company sources and locations. All were being successfully supplied in blends to the market. The purpose of the first stage was to determine suitable specification tests and specification limits for the supply of manufactured sand. It was the intention of the research to prepare a submission to Standards Australia for a redraft of AS 2758.1 to include manufactured sand.
The results of the first stage of the project were published in January 2007 in CCAA’s Research Report Manufactured Sand – National test methods and specification values. The report recommended that the LCPC packing density test and the Micro Deval test be investigated further and that the effects of the physical properties of manufactured sand on concrete mortar be investigated. This second stage of CCAA research into the use of Manufactured sand addresses these two recommendations. The first section of this report details the supplementary research into the Micro Deval and the LCPC packing density tests.
The second part of this report covers mortar trials on eight of the original twenty one manufactured sand samples.
The report includes:
- a description of each test and a discussion of its relevance to manufactured sands;
- an analysis of the specific test results from this programme and the relationship of the results to current standard specification limits (if known) for the method;
- a discussion as to whether the test method should stand alone or be reported and reviewed in conjunction with the results from other test methods;
- a discussion and recommendation as to whether the test method should be a source quality measure only (ie mainly used for monitoring the variability of a single source) or if it may be used for setting specification values used for control of many sources;
- recommendations regarding specification and/or variability limits.

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