Aggregates. Any producer of aggregate for use in portland cement 
concrete must be prepared to demonstrate that his product is suitable 
for use in portland cement concrete. Speifications must include reference 
to accepted standard tests such as those promulgated by the American 
Society for Testing and Materials (1969). \ 
Cement. Most cement mills maintain their own testing laboratories 
to remain assured of good quality control of this highly competitive 
product. Specifications for portland cement are available (ibid). 
Concrete. Most of the concrete in the U. S. is produced as ready- 
mixed concrete. Ninety percent of the total volume is produced by ae 4 
that are members of the National Ready Mixed Concrete Association. 
one means of assuring the consumer of high quality concrete Pe to 
the job site, the NRMCA and the Associated General Contractors of America i 
have adopted and published a statement of separate and joint responsibilities 
(NRMCA, 1965). NRMCA has also published a statement entitled, What Quality 
Guarantee Should the Customer Expect from the Ready-Mixed Concrete Producer 
(Walker, 1961), and standard specifications for ready-mixed concrete, 
NRMCA Pub. No. 124. 
In an effort to assure adequate standard for concrete plants the 
NRMCA and the Concrete Plant Manufacturers Bureau have published a 
statement entitled, Concrete Plant Standards of the Concrete Plant Manu- 
factureres Bureau (NRMCA, 1967). NRMCA also provides instructions and 
check lists for certification fo Ready Mixed Concrete Production Facilities 
(NRMCA, 1967). In order to assure that concrete delivered in trucks is 
acceptable, NRMCA and the Truck Mixer Manufacturers Bureau have published 
a statement entitled, Truck Mixer and Agitator Standards of the Truck 
Mixer Manufacturers Bureau (NRMCA, 1966). Each member company is expected 
to abide by these standards. | 
The referenced documents are excellent guides? however, they must | 
be enforced and reinforced by inspectors on the job. 
Requirements in CONUS or Remote 
Fundamentally, there is no difference in requirements for production 
of ingredients and their blending into portland cement concrete whether 
the job site is in CONUS or remote. The same plant items and equipment 
are required in either case. A CONUS site may make it possible to use 
existent concrete production facilities whereas a remote site may require 
the whole spectrum of operations to be new. 
* 
Various additional NRMCA publications are included in the reference 
list. 
4-12 
