ITEM 714 – WATER

714.1 Description

This Item covers criteria for acceptance of Questionable Water either natural or wash water for use in concrete.

714.2 Requirements

The mixing water shall be clear and apparently clean. If it contains quantities or substances that discolor it or make it smell or taste unusual or objectionable, or cause suspicion, it shall not be used unless service records of concrete made with it (or other information) indicated that it is not injurious to the quality, shall be subject to the acceptance criteria as shown in Table 714.1 and Table 714.2 or as designated by the purchaser.

When wash water is permitted, the producer will provide satisfactory proof or data of non-detrimental effects if potentially reactive aggregates are to be used. Use of wash water will be discontinued if undesirable reactions with admixtures or aggregates occur.

Table714.1 – Acceptance Criteria For Questionable Water Supplies

Physical Properties	Limits
Compressive strength, min. % Control at 7 days Time of Setting deviation from control Time of Setting (Gillmore Test)    Initial    Final Appearance Color Odor Total Solids pH Value	90 From 1:100 earlier to 1:30 later No marked change No marked change Clear Colorless Odorless 500 parts/million max. 4.5 to 8.5

 Table714.2 Chemical Limitation for Wash Water

Chemical Properties

Limits

Chemical Requirements, Minimum Concentration Chloride as C1(-1) expressed as a mass percent of cement when added to the C1 (-1) in the other components of the concrete mixtures shall not exceed the following levels: 1. Prestressed Concrete 2. Conventionally reinforced concrete in a moist environment and exposed to chloride 3. Conventionally reinforced concrete in a moist environment but not exposed to chloride 4. Above ground building construction where the concrete will stay dry Sulfate as SO4, ppmA Alkalies as (Na2O + 0.658 K2O), ppm Total Solids, ppm

0.06 percent 0.10 percent 0.15 percent No limit for corrosion 3000 600 50000

^A          Wash water reused as mixing water in concrete may exceed the listed concentrations of sulfate if it can be shown that the concentration calculated in the total mixing water, including mixing water on the aggregate and other sources, does not exceed that stated limits.

Water will be tested in accordance with, and shall meet the suggested requirements of AASHTO T 26.

Water known to be of potable quality may be used without test.