Pages F-70 through F-71.pdf
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- Attached to
- OR DOT CRGNSA 100(4), Historic Columbia River Highway State Trail, Mitchell Point Crossing
- Solicitation number
- 69056720B000024
About this file
This document contains preconstruction testing requirements for a shotcrete project. The project involves constructing a historic state trail in Oregon utilizing shotcrete. Test panels will be produced using the proposed mix designs, personnel, equipment and operating parameters for the project. A minimum of three test panel sets will be prepared for each mix, with varying concrete coloring agent quantities, to evaluate color and finish. Strength, permeability, chloride content and other testing will be conducted on cores extracted from the panels in accordance with standards. The accepted coloring agent ratio from visual assessment of cured panels will be used for all shotcrete work.
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F-70 DIVISION 550
Revised by Amendment A002
Special Contract Requirements Project: OR DOT CRGNSA 100(4), Historic Columbia River Highway State Trail, Mitchell Point Crossing
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2020.11.18 09:13:53 -08'00'
F-71 DIVISION 550
566.07 Preconstruction Testing.
Shoot test panels using the same personnel, material, equipment, operating pressures and mix designs proposed for the project. Produce test panels for each proposed mix proportion, each anticipated shooting orientation and each proposed nozzle operator. Add a concrete coloring agent to provide integrally colored shotcrete according to the requirements outlined below.
For each mix type, prepare a minimum of three test panel sets each consisting of two test panels each for evaluation of concrete coloring agent requirements. For each set, determine concrete coloring agent batch quantities and demonstrating the range of shotcrete finishes and textures. Prepare one baseline sample set with sufficient concrete coloring agent to match color number 36081 of the Federal Color Standards (FED-STD-595C) when the shotcrete has cured. Vary shotcrete coloring agent batch quantities for the other two sample sets to produce noticeable color variations, both lighter and darker. The maximum quantity of coloring agent is not to exceed 10 percent of the cement weight.
Do not move test panels for a minimum of nine (9) hours after shooting and keep all test panels without disturbance until the time of testing. Cover test panels for strength testing by a polyethylene sheet until the time of coring. Do not cover test panels to be used for the visual assessment of shotcrete coloration, but expose faces to direct sunlight to the extent practicable.
Provide the CO access to the test panels for the visual assessment of shotcrete coloration and texture. After the test panels have had at least 2 weeks exposure to sun, the CO will select a test panel to serve as a guide for shotcrete coloration and texture. Include the accepted concrete coloring agent mix ratio in the shotcrete mix design submittal and use for all subsequent shotcrete work.
Between 28 and 48 days, determine the maximum water-soluble chloride-ion concentration on at least three different test panel samples according to ASTM C1218.
Revised by Amendment A002
Special Contract Requirements Project: OR DOT CRGNSA 100(4), Historic Columbia River Highway State Trail, Mitchell Point Crossing
(a) Field Trials. Conduct preconstruction testing of shotcrete with field trials according to the following:
(1) Test panels. Prepare and cure test panels according to Chapter 10 Preconstruction Trials and Testing of ACI 506.5, Guide for Specifying Underground Shotcrete. Produce enough panels to satisfy testing requirements provided in Subsection 566.07(a)(3).
(2) Coring. Extract no less than three, 3-inch (75-millimeter) diameter, full-depth cores from each panel at each test interval to satisfy testing requirements in accordance with the 1 day and 7 days minimum strength requirements provided in Table 566-1. Do not extract cores for 1 hour compressive strength testing.
(3) Testing. Perform and report testing following to requirements of Chapter 10 Preconstruction Trials and Testing of ACI 506.5, Guide for Specifying Underground Shotcrete.
2020.11.17 18:48:18 -08'00'
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File details come from the government source that posted it. Updated .