for Highway Construction Page 700 of 71 5 SECTION 714 – SECONDARY CEMENTITIOUS MATERIALS
714.01 General Requirements.
Protect secondary cementitious materi als (SCM) from exposure to moisture until used. Tightly seal and adequately separate containers used for transport or storage from other material containers to prevent seepage or mixing of materials. Provide equipment used for discharge with positive shut -off controls at the point of discharge. SCM used as a partial substitute for portland cement may cause a delay in strength gain and may require more curing time before the c oncrete is exposed to loadings. The Engineer may accept SCM for use on the basis of the manufacturer’s certification as specified in 106.04 and 106.05. Submit the manufacturer's certification indicating material class and compliance to material specifications.
714.02 Fly Ash .
Provide fly ash that meets AASHTO M 295 Class F, except loss of ignition (LOI) must not exceed 3.0 percent. Calcium c ontent (CaO) of fly ash must not exceed 18%. Alkali content (Na 2Oe) of the concrete must not exceed 3.0%
714.03 Ground Granulated Blast Furnace Slag.
Provide ground granulated blast furnace slag that meets AASHTO M 302 Grade 100.
714.04 Silica Fume .
Provide silica fume that meets AASHTO M 307 with a maximum available alkali of 1.5 percent and 10 percent or less retained when wet- sieved on the No. 325 screen.
714.05 Blended Secondary Cementitious Materials .
Provide blended secondary cementitious materials confor ming to ASTM C1697. Each cementitious material must be sampled before blending.
714.06 Natural Pozzolans.
Provide natural pozzolans that meet AASHTO M 295 Class N. for Highway Construction Page 701 of 71 5 SECTION 715 – GABION AND REVET MATTRESS
715.01 Mesh .
Fabricate gabion panels for the base, ends, sides, diaphragms, and lids from welded or twisted wire mesh . Use only 1 type of wire mesh within a structure. Meet the requirements in Table 715.01- 1 below for individual wires of welded or twisted mesh: Table 715 .01-1 – Wire Criteria Characteristic Test Designation Requirements Minimum Tensile Strength ASTM A 370 60,000 psi Wire Size Wire Diameter Minimum Galvanizing US Steel Wire Gauge ASTM A 641 and ASTM A 90 11 0.120 in 0.116 in 0.80 oz/ft2 Wire Size Wire Diameter Minimum Galvanizing US Steel Wire Gauge ASTM A641 and ASTM A 90 9 0.148 in 0.144 in 0.90 oz/ft2 Provide welded wire mesh that meets ASTM A185, except 600 pounds force for 11 -gauge and 800 pounds force for 9- gauge wires on the weld shears. Wire gauges are United States Steel Wire Gauge (USSWG) after galvanizing. Manufacture gabion panels of the welded wire mesh from 11 -gauge or 9- gauge wire. Provide mesh to form a nominal 3 inch by 3 inch square grid pattern made by resistance welding in accordance with ASTM A185. Ensure the maximum diagonal dimension of a grid opening is 4.75 inches. Manufacture gabion panels of twisted wire mesh from 11 -gauge wire with 9 -gauge selvedge wires. Form a uniform hexagonal pattern and with a nonraveling twist. Do not exceed 4.75 inches on the major axis (maximum line dimension) of hexagonal openings.
715.02 Fabrication.
Fabricate gabions so the sides, ends, lids, and diaphragms can be assembled at the project site into a rectangular or square basket of required sizes. Construct gabions as a single unit. Weave the base, ends, and sides into a single unit or 1 edge of these members connected to the base section of the gabion so strength and flexibility at the point of connection is at least equal to that of the mesh . Where the length of the gabion exceeds its horizontal width, equally divide the gabion by diaphragms, of the same mesh and gauge as the body of the gabion, into cells whose length does not exceed the horizontal width. Provide the gabion with the necessary diaphragms secured in proper position on the base section so additional tying at this juncture will not be necessary. Securely selvedge or bound perimeter edges so the joints formed by tying the selvedges have the same strength as the body of the mesh.