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並前往https://www.dot.state.mn.us/stateaid/projectdelivery/pdp/pavement/salt-rvalue-determination.pdf

MnDOT Presentation

the resistance, “R” value, of aggregate bases, subbases and subgrade soils is determined. ▻ R-Value Test Procedures: ◦ California Test 301. ◦ ASTM D2844.

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