- 790 - SECTION 1005 -- WATER FOR CONCRETE
1005.01 Description
1.Water shall be free from objectionable quantities of oil, acid, alkali, salt, organic matter, or other deleterio us materials and shall not be used until the source of supply has been approved.
2.Wash water from the mixer washout may be used only with the Engineer’s approval. Use of wash water will be discontinued if undesirable reaction with admixtures or aggregates occurs.
1005.02 Material Characteristics
1.Water which contains more than 0.25% total solids by weight shall not be used.
2.When required by the Engineer, the quality of mixing water shall be determined by NDOT C 114, NDOT T 290, NDOT D 512, NDOT C 1602, ASTM C 31, ASTM C 109, ASTM C 191, and ASTM C 1603.
3.Upon written request by the concrete producer and approval by Engineer, the concrete producer may utilize up to 10% wash water for batching all classes of concrete with the following conditions:
a.Wash water conforms to requirements in Paragraph 2 of Subsection 1005.02.
b.Wash water must be clarified wash water that has been passed through a settling pond system.
c.Wash water must be scalped off of a settling basin that has been undisturbed for a minimum of 12 hours.
d.Wash water must be metered into each load.
e.Wash water quantities shall be shown on the batch ticket. - 791 - SECTION 1006 -- CALCIUM CHLORIDE
1006.01 Description
1.Calcium Chloride shall be Type S (Solid) or Type L (Liquid). Calcium Chloride can be used for, but not limited to, dust control and acceleration of t he set of concrete.
1006.02 Material Characteristics
1.The requirements for calcium chloride shall be as shown in ASTM D 98.
1006.03 Acceptance Requirements
1.Acceptance shall be based on requirements contained in the Department’s Materials Sampling Guide.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 824–824 of 1,048.