CONCRETE TECH-TIP

24

Jobsite Addition of Water

1. WHAT is Jobsite Addition of Water? 75mm

100mm

125mm

150mm

2. WHY is Water Added to the Jobsite?

0 5l 10l

15l

Water Added, l/m3

TELEPHONE (204) 667-8539 FAX (204) 668-9740 www.concretemanitoba.ca • e-mail:

admin@concretemanitoba.ca

3. HOW to Add Water at the Jobsite

Jobsite Water Addition

1. Establish the maximum allowable slumpand water content permitted by the jobspecification.

2. Estimate or determine the concrete slumpfrom the first portion of concrete dischargedfrom the truck.

3. Add an amount of water such that themaximum slump of water-cementingmaterials ratio according to the specificationis not exceeded.

4. Measure and record the amount of wateradded. Water in excess of that permittedabove should be authorized by designatedrepresentative of the purchaser.

5. Mix the concrete at mixing speed to producea uniform mix .

6. Do not add water if:a. the maximum water-cementing

materials is reached,b. the maximum slump is obtained,c. the load has already been retempered

7. If superplasticized concrete falls below thespecified slump, special precautions shouldbe taken when retempering the load.