Standard Practice for Concrete Pavements

1. Purpose. This manual provides information on the materials and construction procedures for concrete pavements.

2. Scope. This manual describes the constituents to be used in concrete, the procedures to be used in manufacturing concrete, and the equipment and procedures to place, texture, and cure concrete for pavements.

3. Responsibilities, strength, and air content.

a. Responsibility for mixture proportioning. The responsibility for mixture proportioning must be clearly assigned to either the contractor or the contracting officer in the project specifications.

When the contracting officer is responsible for mixture proportioning, he will approve all concrete materials as well as determine and adjust proportions of all concrete mixtures as necessary to obtain the strength and quality of concrete required for the pavements. Cement will be a separate pay item in the contract. When the contractor is responsible for mixture proportioning, he will control all proportions of the concrete mixture necessary to obtain the strength and quality of the concrete required for the pavements, and cement will not be a separate pay item in the contract. However, the contracting officer is responsible for approving the quality of all materials the contractor uses in the concrete.

b. Approval responsibility. The contracting officer is responsible for approval of all materials, mixture proportions, plants, construction equipment, and construction procedures proposed for use by the contractor. The contractor must submit proposed mixtures if he is responsible for mixture proportioning; samples of all materials; and detailed descriptions of all plants, construction equipment, and proposed construction procedures prior to the start of construction.

c. Flexural strength. Structural designs are based on flexural strengths that the concrete is expected to obtain at 28 days for road pavements and 90 days for airfield pavements. These ages are not adequate for quality control in the field since a large amount of low-strength concrete could be placed before strength tests on samples revealed the problem.

Correlations can be established between a 14-day strength and the 28- or 90–day strength used in design, and this correlated 14-day strength can be used as a strength check for a more timely concrete mixture control in the field....

Mã tiêu chuẩn:	ARMY TM 5-822-7
Nhóm tiêu chuẩn:	ARMY TM 5-822-7
Tên văn bản(Tiếng Việt)	Standard Practice for Concrete Pavements
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