Description of Requirements_18Apr24.pdf
PDF 119 KB Posted
- Attached to
- Concrete Curing Oven for ERDC GSL
- Solicitation number
- W912HZ24Q0418
About this file
This document is a Description of Requirements (DOR) for a concrete curing oven to be acquired by the Engineer Research and Development Center (ERDC), Geotechnical and Structures Laboratory (GSL). The oven must have minimum internal dimensions of 9 ft deep by 9 ft wide by 7 ft tall, use natural gas as the primary power source, and be capable of achieving temperatures up to 300°F with humidity controls. The oven must have a 30,000-lb internal capacity to accommodate large concrete samples such as 24-inch diameter, 24-inch long cylinders. The oven will be placed in a high-bay facility and used to dry concrete for approximately 30-day periods.
The related federal contract opportunity is a Request for Quote (RFQ) under NAICS code 333994 - Industrial Process Furnace and Oven Manufacturing, with a set-aside for small businesses. Offers are due by April 25, 2024 at 1:00 PM CST and will be evaluated based on lowest price and technical capability to meet the requirements outlined in the DOR. The Government intends to award a contract without discussions, so the initial offer should represent the offeror's best terms.
View the file
Other files
| File | Type | Posted |
|---|---|---|
| Question and Answer_19Apr24.pdf |
On GovTribe
Work with this file
- Download the original file
- Contacts named in this file
- Similar government files
- Ask GovTribe AI about this file
Text version
Description of Requirement Concrete Curing Oven for ERDC GSL
The Engineer Research and Development Center (ERDC), Geotechnical and Structures
Laboratory (GSL) has the need to acquire one large commercial oven for drying large concrete samples. Examples of large concrete samples include cylinders, beams, cubes, and slabs of various sizes and concrete strengths.
Oven Requirements:
• Minimum internal dimensions shall be 9 ft deep by 9 ft wide by 7 ft tall. Exterior dimensions must not exceed 12 ft wide.
• Natural gas shall be used as the primary power source for heat generation. The vendor is responsible for supplying a 2-inch supply line to connect gas to the building where the oven will be stored.
• Digital thermostat control with combination airflow and capable of achieving minimum temperatures of 300 degrees Fahrenheit (F).
• Humidity controls to prevent rapid evaporation which may lead to cracking. This is vendor preference – a specific type of humidity control is not required.
• Basic thermostat control; there is no need to introduce fresh air.
• Internal finishes shall be made of stainless steel.
• Maximum required temperature is 300º F.
• Oven must have a 30,000-lb internal capacity to ensure the ability to operate in the oven with some factor of safety.
• Any standard digital controller will be acceptable.
• Must have a data recording/logging capability (for example, temperature vs time, and a 2-in-1 controller recorder).
• The control panel may be located on either the front or side of the oven.
General Information:
Minimum time after placement for concrete to be dried in oven is 7 days. A typical drying/batch cycle will occur after the concrete has initially set and cured. This will ensure that most exothermic reactions will occur outside of the oven. Carts to move the concrete in and out of the oven are not required.
The oven will be used to dry large circular cylinders of cured concrete (24-in diameter, 24-in long). Approximate weight of each cylinder is 1000-lbs of various strengths in accordance with
ASTM C556-19 which requires an oven to maintain a temperature of 110 C +/- 5° C (230 F +/- 41°
F). Nine cylinders will be cured simultaneously. Dry periods will possibly last for 30-days.
The oven will be placed in a high-bay facility with large roll up doors and forklift access.
Oven will operate at approximately 240’ above sea level.
Bulk concrete will be dried; however, the oven will be installed in a facility that produced concrete and the process is inherently dusty.
Internal rack configuration will be handled by the Government after installation.
A cart or forklift will be used to facilitate loading of large objects in the oven.
No volatiles or solvents will be placed in the oven.
The facility has 480v capability.
No specific heat-up rate is required.
There are no specific uniformity requirements.
For typical moisture loss considerations, please see Figure 1. Figure 1 provides a plot of the time
(days) vs change in mass (%) and posttest water content (%) for large cylinders of concrete (18-in in diameter by 16-in deep) that were dried at 212 degrees F. The initial mass of the concrete samples was approximately 300-lbs. Over the time in the oven the samples decreased in mass approximately 3%. Larger cylinders than this (quantity 9, 24-in. diameter by 24-in. deep) will be dried for similar periods (approximately 30 days). As indicated by the attached plot, most of the mass loss (evaporation) occurs in the first few days.
Figure 1. Plot of time vs. change in mass.
The oven supplier will be responsible for installation on an existing concrete foundation. The oven floor should be capable of carrying a distributed load of up to 30,000 lbs. The quote should include all shipping expenses. A Quality Assurance/Quality Control (QA/QC) check will be performed after installation is complete.
Delivery/Installation Location:
Engineer Research and Development Center
3909 Halls Ferry Road
Concrete and Materials Branch, Building 6000
Vicksburg, MS 39180
Delivery Date: No later than 32 weeks from award. Please contact ERDC Technical POC
(Bradford Songer 601-634-3255) one week before delivery.
File details come from the government source that posted it. Updated .