Permits & Development - Encroachment(EP)/Driveway(DW) Permits - 2007_EP-07-301 thru EP-07-400_ - EP-07-352

Home Browse Search

B. The available alkali,as sodium oxide equivalent,shall not exceed 1.5 percent when determined in conformance with the requirements in ASTM Designation: C 311 or the total alkali, as sodium oxide equivalent, shall not exceed 5.0 percent when determined in conformance with the requirements in AASHTO Designation: T 105. C. Commingling of fly ash from different sources at uncontrolled ratios is permissible only if the following criteria are satisfied: 1. Sources of fly ash to be commingled shall be on the approved list of materials for use in concrete. 2. Testing of the commingled product is the responsibility of the fly ash supplier. 3. Each fly ash's naming average of density shall not differ from any other by more than 0.25g/cm3 at the time of commingling. 4. Each fly ash's running average of loss on ignition shall not differ from any other by more than one percent at the time of commingling. 5. The final product of commingled fly ash shall conform to the requirement in AASHTO Designation: M 295. • Raw or calcined natural pozzolans shall conform to the requirements in AASHTO Designation: M 295,Class N and the following requirements: A. Calcium oxide content shall not exceed 10 percent. B. The available alkali,as sodium oxide equivalent,shall not exceed 1.5 percent when determined in conformance with the requirements in ASTM Designation: C 311 or the total alkali, as sodium oxide equivalent, shall not exceed 5.0 percent when determined in conformance with the requirements in AASHTO Designation: T 105. • Ground Granulated Blast Furnace Slag (GGBFS) shall conform to the requirements in AASHTO Designation: M 302,Grade 100 or Grade 120. • Silica Fume shall conform to the requirements of AASHTO Designation: M 307 with reduction in mortar expansion of 80 percent,minimum,using the cement from the proposed mix design. 90-2.01C REQUIRED USE OF SUPPLEMENTARY CEMENTITIOUS MATERIALS • The amount of portland cement and SCM used in portland cement concrete shall conform to the minimum cementitious material content provisions in Section 90-1.01, "Description," or Section 904.05, "Optional Use of Chemical Admixtures,"and the following: A. If a blended cement conforming to the provisions in Section 90-2.O1A, "Cement," is used,the minimum amount of SCM incorporated into the cement shall conform to the provisions in this Section 90-2.01C. B. Fly ash or natural pozzolan,silica fume,or GGBFS shall not be used with Type IP or Type IS cements. • Use of SCMs shall conform to the following: A. If fly ash or natural pozzolan is used: 1. The minimum amount of portland cement shall not be less than 75 percent by mass of the specified minimum cementitious material content. 2. The minimum amount of fly ash or natural pozzolan shall be: a. Fifteen percent by mass of the total amount of cementitious material if the calcium oxide content of fly ash or natural pozzolan is equal to or less than 2 percent by mass; b. Twenty-five percent by mass of the total amount of cementitious material if the calcium oxide content of fly ash or natural pozzolan is greater than 2 percent by mass. B. The total amount of fly ash or natural pozzolan shall not exceed 35 percent by mass of the total amount of cementitious material to be used in the mix. If Section 90-1.01, "Description," specifies a maximum cementitious material content in kilograms per cubic meter,the total mass of portland cement and fly ash or natural pozzolan per cubic meter shall not exceed the specified maximum cementitious material content. C. If silica fume is used: 1. The amount of silica fume shall not be less than 10 percent by mass of the total amount of cementitious material. 2. The amount of portland cement shall not be less than 75 percent by mass of the specified minimum cementitious material content. Contract No. 10-OM7104 72