Rock dust
Rock dust—very fine dust resulting from rock crushing operations. Addition of a small quantity of rock dust will sometimes improve the pumpability of concrete.A PHP Error was encountered
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Filename: front/dictionary.php
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Backtrace:
File: /home/concrete/public_html/application/views/front/dictionary.php
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Function: _error_handler
File: /home/concrete/public_html/application/views/front/structure.php
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Function: view
File: /home/concrete/public_html/application/controllers/Dictionary.php
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Function: view
File: /home/concrete/public_html/index.php
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Function: require_once