504 joint materials, and all other necessary components. Materials not conforming to this section of the specifications or from sources not listed in the contract documents shall not be used without written consent from the Engineer.
626.5.1.1 -Facing Elements: 626.5.1.1.1 -Reinforced Concrete Facing Elements: The facing elements shall be fabricated in accordance with Section 601 of the Spe cifications with the following exceptions and additions:
compressive strength of 4,000 psi at 28 days. All concrete shall have air entrainment of 7 % plus or minus 2.5 % with no o ther additives. Specified concrete properties are to be tested in accordance with applicable provision of made if the compressive strength test result is greater than or equal to, 4,000 psi. A Production Lot is defined as a group of panels that will be represented by a single compressive strength test result is greater than or equal to, 4,000 psi. A Production Lot is defined as a group of elements that will be represented by a single compressive strength sample and will consist of a single day’s production. A minimum of two cylinders shall be required for every compressive strength sample.
compressive stre ngth of 1,000 psi.
concrete surface for the front face shall have a Class 1 finish as define by Section finish for the rear face. The rear face of the element shall be screeded to eliminate open pockets of aggregate and surface distortions in excess of ¼ inch. The panels shall be cast on a flat area. The clevis loops, tie strip guide, or other galvanized devices shall not contact or be attached to the face element reinforcement steel.
clearly scribed on an unexposed face of each element.
dangers of chipping, discoloration, cracks, fractures, and excessive bending stresses. Elements in storage shall be supported in firm blocking to protect the element connection devices and the exposed exterior finish.
one (1) inch, except for coil and loop embeds which shall be 3/16 inch. All other dimensions within 3/16 inch.
two diagonals shall not exceed ½ inch.
over a length of five ( 5) feet shall not exceed ¼ inch. Surface defects on the texture d-finished surfaces measured over a length of five ( 5) feet shall not exceed 5/16 inch.
505 Units shall be rejected because of failure to meet any of the requirements specified above. In addition, any or all of the following defects shall be sufficient cause for rejection: 1.Defects that indicate imperfect molding. 2.Defects indicating honeycombed or open textured concrete. 3.Cracked or severely chipped elements. 4.Color variation on front face of panel due to excess form oil or other reasons.
All reinforcing steel shall be in accordance with Section 602 and shall be epoxy coated. Precast concrete Mechanically Stabilized Earth wall facing elements shall also conform to MP 604.02.40.
626.5.1.1.2 -Modular Block Facings: The length and width of each block shall be within ±1/8 inch. The height of each block shall be within ±1/16 inch. Hollow units shall have a minimum wall thickness of 1.25 inch. When a broken face finish is used the dimension of the front face shall be within one ( 1) inch of the t heoretical dimension of the unit. All units shall be sound and free of cracks or other defects that would interfere with the proper placing of the unit or significantly impair the strength or performance of the construction. Cracks greater than 1/64 inch wide and greater than 25% of the block height is grounds for rejection. The front fact or faces of units that are to be exposed shall be free of chips, cracks or other imperfections that can be seen when viewed from a distance of thirty ( 30) feet under diffused lighting. Up to 5% of the shipment may contain slight cracks or small chips not larger than one ( 1) inch. Color and finish shall be shown on the shop drawings and shall be erected with a running bond configuration. When cap units are used theys hall be cast to or attached to the top of the modular block wall in strict accordance with the manufacturer’s recommended procedure.
626.5.1.1.2.1-Modular Block Mix Design : Each manufacturing facility shall provide a copy of their mix design, including test results and material sources, to MCS&T Division for each type of block that they manufacture. A separate mix design shall be required for each type of block, as the compaction of each type of block may vary and affect the various test results. An approved independent laboratory shall perform the testing when establishing the mix design. After initial approval, each mix design shall remain approved for a period of three years after the date of initial approval. If there are any changes in the mix, such as changes in material sources, any materials such as pigments are added, or the pigment color is changed, then a new mix design shall be required. The modular block units shall conform to the following: All of the units shall conform to AS TM C1372, except that:
individual unit. The average of five units shall be used as the mix design strength.
five units shall be used as the mix design absorption.
ASTM C1262 in a 3% saline solution shall be the minimum of the following: