- 796 - SECTION 1009 -- SILICA FUME
1009.01 Description
1.Silica fume is very fine pozzolanic material composed mostly of amorphous silica produced by electric arc furnaces as a by-product of the production of elemental silicon or ferro-silicon alloys.
1009.02 Material Characteristics
1.Silica fume shall conform to the requirements of ASTM C 1240, including the optional chemical and ph ysical requirements, except that the minimum SiO 2 shall be 90% by weight.
2.Silica fume in slurry form shall not be allowed.
1009.03 Procedures
1.The Contractor shall provide a dequate protection for the silica fume against dampness.
2.Silica fume shall be protected from temperatures in excess of 90°F (32C).
3.Silica fume shall be protected from exposure to direct sunlight.
4.Each shipment of silica fume sent to a project or ready mix plant shall be accompanied with a certific ate of compliance executed by the manufacturer. The certificate must include the following information:
a.The name of the manufacturer. b. The location of the manufacturer. c. The batch or lot number. d. The date of manufacture. e. The weight of the shipment.
f.The Department’s specificat ions that the product is in compliance with.
5.No silica fume which has become caked or lumpy shall be used. 6. Silica fume which has been spilled shall not be used. 1009.04 -- Acceptance Requirements
1.Silica fume approved for use is on the Department’s Approved Products List. The suppliers, in addition to providing a manufacturer's certification of compliance for each sh ipment, must submit certification annually to the Department’s Materials and Research Division stating that their product meets Depart ment’s specifications.
2.Silica fume that arrives wit hout proper certif ication shall be sampled, tested, and approved by the Department’s Materials and Research Division before use. - 797 - SECTION 1010 -- WHITE OPAQUE POLYETHYLENE FILM AND WHITE BURLAP-POLYETHYLENE SHEET FOR CURING CONCRETE
1010.01 Description
1.White opaque polyethylene f ilm and white burlap-polyethylene sheet shall conform to requirements in this Section.
1010.02 Material Characteristics
1.White opaque polyethylene film for curing concrete shall conform to the requirements of AASHTO M 171 except that:
a.The reflectance, minimum percent, shall be 60. b. The requirement for moisture loss shall not apply. c. The AASHTO requirement fo r tensile strength and elongation, in both the longitudinal and transverse direction, shall not apply.
2.Reinforced white opaque polyethylene film for curing concrete shall conform to the requirements of white opaque polyethylene film in AASHTO M 171 except that:
a.The minimum percent elongation in both the longitudinal and transverse directions shall not apply.
b.The requirement that the po lyethylene film shall consist of a single sheet shall not apply.
c.The reflectance, minimum percent, shall be 60.
3.White burlap-polyethylene sheet for curing concrete shall conform to the requirements of AASHTO M 171 except that:
a.The burlap port ion weight shall not be less than 0.05 lb/ft² (0.25 kg/m 2).
b.The reflectance, minimum percent, shall be 60.
1010.03 Acceptance Requirements
1.Acceptance shall be based on sampling and testing in accordance with requirements in the Department’s Materials Sampling Guide .
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 830–830 of 1,048.