@techreport{c09_committee_test_nodate,
	title = {Test {Method} for {Air} {Content} of {Freshly} {Mixed} {Concrete} by the {Pressure} {Method}},
	url = {http://www.astm.org/cgi-bin/resolver.cgi?C231C231M-17A},
	language = {en},
	urldate = {2019-11-15},
	institution = {ASTM International},
	author = {{C09 Committee}},
	doi = {10.1520/C0231_C0231M-17A},
}

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