PWS.pdf

Performance Work Statement for Masonry Target Walls

BACKGROUND:

The US Army Corps of Engineers Research and Development Center (ERDC) requires the building of multiple 8 ft x 8 ft masonry walls sections within steel frames over the course of three years. The initial masonry building will take place 3 weeks after award at ERDC’s Big Black Test Site on Bovina Cut Off Rd in Vicksburg, MS.

DESCRIPTION OF SERVICES:

The ERDC needs a total of QTY: 6 masonry target walls constructed at the Big Black Test Site with options for additional walls exercised throughout the next three years.

1.0 The contractor will construct:

QTY: 3 - 8” thick lightly reinforced CMU wall sections inside steel wall frames.

Material and build details are listed in Section 2.2.

QTY: 3 - 8” thick heavily reinforced CMU wall sections inside steel wall frames.

2.0 The contractor will build as prescribed below in the section entitled Masonry Building Requirements. For the initial award and all the options that are exercised, the contractor will also maintain accurate building logs for each wall and provide all necessary equipment to perform the work. The ERDC will provide the necessary quantity of masonry bricks/blocks as applicable, mortar, sand, and rebar.

Contractor will create mortar test samples as prescribed for each wall build. (ERDC will provide the necessary supplies to complete this task.) The contractor carries no responsibility for sample curing or testing procedures.

ADDITIONAL OPTIONS:

OPTION 1: QTY: 3 - 12” thick triple wythe brick wall sections inside steel wall frames.

Material and build details are listed in Section 2.1.

OPTION 2: QTY: 3 - 12” thick triple wythe brick wall sections inside steel wall frames.

Material and build details are listed in Section 2.1.

OPTION 3: QTY: 3 - 12” thick triple wythe brick wall sections inside steel wall frames.

Material and build details are listed in Section 2.1.

OPTION 4: QTY: 3 - 12” thick triple wythe brick wall sections inside steel wall frames.

Material and build details are listed in Section 2.1.

OPTION 5: QTY: 3 - 8” thick lightly reinforced CMU wall sections inside steel wall frames.

OPTION 6: QTY: 3 - 8” thick lightly reinforced CMU wall sections inside steel wall frames.

OPTION 7: QTY: 3 - 8” thick lightly reinforced CMU wall sections inside steel wall frames.

Material and build details are listed in Section 2.2.

OPTION 8: QTY: 3 - 8” thick heavily reinforced CMU wall sections inside steel wall frames. Material and build details are listed in Section 2.2

OPTION 9: QTY: 3 - 8” thick heavily reinforced CMU wall sections inside steel wall frames. Material and build details are listed in Section 2.2

OPTION 10: QTY: 3 - 8” thick heavily reinforced CMU wall sections inside steel wall frames. Material and build details are listed in Section 2.2

Masonry Build Requirements for Each Wall Types:

2.1 Triple Wythe Brick Target Wall

Figure 1. Triple Wythe Brick Target Wall

2.1.1 Materials

A. Brick:

The bricks are solid clay masonry facing units; Grade Severe Weather (SW), Type Face Brick Standard (FBS). The facing brick is a modular-size brick measuring 7⅝” in length, 3 ½” in thickness, and 2 ¼” in depth.

B. Mortar:

The mortar used are a mixture of cementitious material, aggregate, and water conforming to ASTM C270 without any admixtures or additives.

1. The cementitious material is Type M masonry cement without further additions of cements or hydrated lime.

2. The aggregate is natural sand, conforming to the gradation requirements of

ASTM C144 for gradation, organic impurities, friable particles, lightweight constituents, soundness, and density.

3. The water used is potable water (no industrial water is used).

C. Quantities:

The approximate quantities of mortar, sand, and brick needed for a 1 ft x 8 ft x 8 ft triple wythe brick wall are listed in Table 1.

Table 1. Materials Quantities for Triple Wythe Brick Target Wall.

Brick* Sand* Mortar* 1,500 0.75 ton 480 lb. or 6 bags

* Quantities include discarded mortar and culled brick.

2.1.2 Test Samples

Nine samples of each Mortar Test are made during each brick wall target build using the instructions below. Preparation of the test samples is spaced to obtain a sampling of the mortar mix throughout wall builds.

A. Mortar Test Sample Procedure.

The Mortar Test samples are taken in 2” diameter by 4” long cylindrical tubes. The following procedure is used to construct Mortar Test samples:

1. Coat the inner surface of the mold lightly with mineral oil or motor oil.

2. Place the mortar in the molds, in three layers of approximately equal volume, rodding each lager 20 times with a ¼” to ⅜” diameter rod. One complete up-and-down motion of the rod held in a vertical position is defined as one rodding operation. Perform the 20-time rodding operation by making one revolution around the inner surface of the cylinder. In rodding the first layer, do not strike the rod forcibly against the bottom of the mold. In rodding the second and third layers, use only enough force to cause the rod to penetrate the surface of the previous layer.

3. Tap the sides of the mold 15 times to remove any remaining entrapped air.

4. Finish the top of the mold with a float and cover the top of the mold with a cap or plastic bag to minimize evaporation.

B. Curing Samples.

All samples are cured with the wall (at the wall site) for a minimum of 28 days.

These samples are then marked with the date and serial number of the wall from which they were constructed

C. Testing Samples.

Cylinder sample tests per ASTM C780. A minimum of one mortar sample is tested when the age of the wall is 7 days ± 24 hours. A minimum of two mortar samples are tested at 28 days± 24 hours.

1. Cylinder samples should not test below 1,000 psi at 7 days and 1,500psi at28 days.

The PM is notified by his representative upon failure of samples. If a wall does not meet the minimum specifications at 28 days, samples are tested at later intervals.

The PM decides whether or not the wall is to be placed in service as a MOUT target or is to be used elsewhere.

2.1.3 Build Procedure

A. Logbook.

The brick mason is responsible for maintaining a logbook with the following information:

1. Results, date, and time of the initial water absorption rate tests.

2. Date and time of the beginning of wall build.

3. Amount and type of materials used in each target wall including sand, mortar, water, and brick.

4. Time each sample is constructed.

5. Time duration over which each batch of mortar is used.

6. Date and time of completion.

7. Any notes deemed necessary by the mason.

B. Mortar Preparation

1. The mixer used should be a motor-driven, paddle-wheel type unless otherwise agreed upon.

2. The mortar and sand are mixed using a precise measurement of one part mortar to three parts of sand (all parts by volume). No shovels are used for making measurements. A 1-cubic-foot box is filled three times with sand and mixed with one bag of mortar to obtain correct mix proportions.

3. Mixing is completed in 3 to 5 minutes using sufficient water for good mixture fluidity. The "fluidity" of the mix is determined by the experience and discretion of the brick mason.

2.1.4 Bricklaying

A. Typically, one mason constructs the wall with one helper to supply brick, mix mortar, construct samples, and keep records.

B. Mortar that has been mixed for more than 2.5 hours is discarded. Water is added as needed to maintain a consistent fluidity.

C. The brick mason inspects all brick prior to bricklaying and discards any bricks that are defective, per the following requirements:

1. Not effloresced.

2. Free of defects, deficiencies, and surface treatments.

3. No more than 10% of chipping near the edges and comers.

4. No chips exceeding 10% of the face perimeter.

5. No cracks considered extensive by the bricklayer or which extend across the width or thickness of the brick.

6. No more than 3/32 inch of distortion on any axis.

7. The brick layer has any other reason to suspect the brick may not meet specifications.

D. The mason uses consistent force in applying the mortar and maintaining the same amount of mortar on each brick, including the head and collar joints, such that the thickness is consistent, and the entire faces of all joints are filled. Mortar joint thickness specifications are listed in Table 2.

Table 2. Triple Wythe Brick Target Wall Mortar Joint Thickness.

Bed Starter ½” ± ¼” Bed ⅜” ± ⅛“ Head ⅜” ± ⅛“ Collar ¼” minimum, ¾” maximum

E. The triple wythe brick target wall is constructed with one header course every seventh course. Header courses are tied in to both sides of the wall by laying the next higher course with a header on the back wythe. See Appendix A for bonding details.

F. The bricks are laid on a full-thickness bed of mortar, shoved laterally to the adjoining brick, and tapped into final position. This procedure completely fills the head joints, with no slushing of additional mortar. Excess mortar is cut off flush with the brick.

G. All collar joints between each wythe are completely filled with mortar, making sure that no voids are left.

H. Bed joints and head joints are lightly scraped with a sled jointer tool to provide slightly concave joints.

I. If any brick has been disturbed to the extent that the initial brick position and bond has been broken, the brick and old mortar are removed, and the brick is laid again in fresh mortar.

J. The plumb and level of the wall meet the following requirements:

1. The bed joints and top of the wall do not vary from level by more ¼ inch in 8 feet.

2. The variation from plumb and true-to-line does not vary by more than ¼ inch in 8 feet.

3. The alignment of the top of the wall with the bottom of the wall (bottom section of frame) varies no more than ¼ inch in 8 feet.

2.1.5 Cleaning

The completed brick wall is cleaned with a brush. Water is used if necessary, but no acid or other chemicals are used in the cleaning process.

2.1.6 Capping

Masonry targets are capped after the conditioning structure is removed. Capping of masonry walls consists of the following:

A. A layer of grout is placed on the top layer of brick and is screeded off level with the longitudinal steel angles at the top of the wall.

B. A layer of 30 lb. roofing material is laid on top of the grout and angles.

C. The steel cap plate is placed, bolted to the angles, and tightened to 75 ft·lb of torque

2.2 8” Concrete Masonry Units (CMU) Target Wall

Figure 2. 8”CMU Target Wall

2.2.1 Materials

A. 8” Concrete Masonry Units.

The 8-inch CMU is a regular 30-lb, two-cell unit, The dimensions of the CMU are 7⅝” in thickness by 7⅝” in height by 15⅝”in length.

B. Mortar.

The mortar used are a mixture of cementitious material, aggregate, and water conforming to ASTM C270 without any admixtures or additives.

1. The cementitious material is Type M masonry cement without further additions of cements or hydrated lime.

2. The aggregate is natural sand, conforming to the gradation requirements of

ASTM C144 for gradation, organic impurities, friable particles, lightweight constituents, soundness, and density.

3. The water used is potable water (no industrial water is used).

C. Quantities:

The approximate quantities of mortar, sand, and brick needed for a 1 ft x 8 ft x 8 ft CMU block target wall are listed in Table 3.

Table 3. Materials Quantities for CMU Block Target Wall.

Block* Sand* Mortar*

85 0.75 ton 480 lb. or 6 bags

* Quantities include discarded mortar and culled block.

2.2.2 Test Samples

Test samples are constructed during build of the CMU target wall, using the procedures described in Section 2.1.2.

2.2.3 Build Procedure

Logbook and mortar preparation for CMU target wall build remains the same as that for triple wythe brick target wall as described in Section 2.1.3.

2.2.4 Blocklaying

A. Typically, one mason constructs the wall with one helper to supply brick, mix mortar, construct samples, and keep records.

B. Mortar that has been mixed for more than 2.5 hours is discarded. Water is added as needed to maintain a consistent fluidity.

C. The CMU are examined and, in addition to the applicable brick requirements listed in Section 2.1.4, the following requirements are applied to define defective:

1. No visible cracks.

2. No chips that show on the outside of the target wall, or cover an area of more than one square inch.

3. No sash block is used, except at course ends where half block are required. Only stretcher block are used where full block are required.

D. The mason uses consistent force in applying the mortar and maintaining the same amount of mortar on each block, including the head and collar joints, such that the thickness is consistent and the entire faces of all joints are filled. Mortar joint thickness specifications are listed in Table 4.

Table 4. CMU Target Wall Mortar Joint Thickness.

Bed Starter ½” ± ¼” Bed ⅜” ± ⅛“ Head ⅜” ± ⅛“ Collar ¼” minimum, ¾” maximum

E. See Appendix A for bonding details for brick and CMU target walls.

F. The bricks are laid on a full-thickness bed of mortar, shoved laterally to the adjoining brick, and tapped into final position. This procedure completely fills the head joints, with no slushing of additional mortar. Excess mortar is cut off flush with the block.

G. All collar joints between each wythe are completely filled with mortar, making sure that no voids are left.

H. Bed joints and head joints are lightly scraped with a sled jointer tool to provide slightly concave joints.

I. If any block has been disturbed to the extent that the initial brick position and bond has been broken, the block and old mortar are removed, and the block is laid again in fresh mortar.

J. The plumb and level of the wall meet the following requirements:

1. The bed joints and top of the wall do not vary from level by more ¼ inch in 8 feet.

2. The variation from plumb and true-to-line does not vary by more than ¼ inch in 8 feet.

3. The alignment of the top of the wall with the bottom of the wall (bottom section of frame) varies no more than ¼ inch in 8 feet.

2.2.5 Wall reinforcement

One of two reinforcement configurations will be utilized in the 8” CMU target wall builds, i.e., lightly reinforced or heavily reinforced.

A. Lightly reinforced CMU target wall consists of steel reinforcement rods (i.e., rebar) placed within the block cavities every 4 ft and those cavities filled with mortar as indicated in Figure 3.

Figure 3. Lightly reinforced CMU target wall reinforcement layout.

B. Heavily reinforced CMU target wall consists of steel reinforcement rods (i.e., rebar) placed within the block cavities of every other cell and those cavities filled with mortar as indicated in Figure 4.

Figure 4. Heavily reinforced CMU target wall reinforcement layout.

2.2.5 Cleaning

The completed brick wall is cleaned with a brush. Water is used if necessary, but no acid or other chemicals are used in the cleaning process.

2.2.6 Capping

Masonry targets are capped after the conditioning structure is removed. Capping of masonry walls consists of the following:

D. A layer of grout is placed on the top layer of block and is screeded off level with the longitudinal steel angles at the top of the wall.

E. A layer of 30 lb. roofing material is laid on top of the grout and angles.

F. The steel cap plate is placed, bolted to the angles, and tightened to 75 ft·lb of torque

PERFORMANCE STANDARDS. The performance standards, as set forth in the Performance Work Statement are the standards the vendor must meet for a particular performance objective to be deemed acceptable. Below is a summary table.

Performance Tasks Performance Standard Acceptabl e Quality Level

(AQL)

Monitoring Method

Incentive/Disinc entive for Meeting or Not Meeting the

TASK 1.0: Site Visit – Inspection/Service

POP: 1 month

At a minimum, GSL anticipates 1 day of combined travel and on-site labor of contractor personnel to inspect the build site and component materials to ensure everything is in order prior to beginning.

75% End of PoP assessment

Satisfactory or Unsatisfactory Rating in CPARS

TASK 2.0 : Masonry Building of Target Walls

POP: 1 month

At a minimum, GSL anticipates 5 days of combined travel and on-site labor of contractor personnel for build of masonry target walls.

90% End of PoP assessment

Satisfactory or Unsatisfactory Rating in CPARS

Quality Control Tests conducted on test samples

POP: 2 months

Part of the building procedure is the fabrication of mortar test samples. These test samples will be tested according the testing schedule to ensure mortar strength remains within the predefined specifications of the project.

90% Assessment of QC Test Results

Satisfactory or Unsatisfactory Rating in CPARS

REQUIRED CLAUSES

1. General security requirements and guidance: The security requirements described below apply to all contract personnel (including employees of the prime Contractor (“Contractor”) and all subcontractor employees) supporting the performance requirements of this contract. The Contractor is responsible for compliance with these security requirements. Questions regarding security matters shall be addressed to the designated Government representative (e.g., Contracting Officer Representative (COR), Requiring Activity (RA) representative, or Contracting Officer (if a COR or other RA representative is not appointed)). Contract personnel are critical to the overall security and safety of US Army Corps of Engineers (USACE) installations, facilities and activities, and security awareness training contributes to those efforts.

The Department of Defense (DoD) and Army security training requirements specified below, if applicable, are performance requirements; all applicable contract personnel shall complete initial training within 30 days of contract award or the date new contract personnel begin performance on the contract. Within five business days from the completion of training, the Contractor shall provide written documentation (e.g., email or memorandum) to the Government representative. The documentation shall include the names of contract personnel trained and which training they completed;

the Contractor shall maintain training records as part of their contract files and be prepared to provide copies of training certificates to the Government representative.

Contractor personnel and vehicles are subject to search when entering federal installations. Additionally, all contract personnel shall comply with Force Protection Condition (FPCON) measures, Random Antiterrorism Measures (commonly referred to as “RAMs”), and Health Protection Condition (HPCON) measures. The Contractor is responsible for meeting performance requirements during elevated FPCON and/or HPCON levels in accordance with applicable RA plans and procedures --this includes identifying mission essential and non-mission essential personnel. In addition to the changes otherwise authorized by the changes clause of this contract, should the FPCON or HPCON levels at any individual facility or installation change, the Government may implement security changes that affect contract personnel. The Contractor shall ensure all contract personnel are aware of their security responsibilities, including any site-specific requirements identified in local policies or procedures.

2. Physical security and access control requirements: All contract personnel requiring physical access to a federal installation or facility shall comply with the access control procedures of that location. Contract personnel requiring unescorted access to meet contract performance requirements on a DoD installation in the US shall be vetted by the installation/facility Provost Marshal/Directorate of Emergency Services/Security Office using the National Crime Information Center-Interstate Identification Index (commonly referred to as “NCIC-III”) and Terrorist Screening Database (commonly referred to as “TSDB”). Contract personnel shall comply with all personal identity verification requirements specified in installation/facility policies and procedures. Contract personnel who do not meet requirements for unescorted access to USACE facilities shall coordinate escorted access with the Government representative, as needed. Contract personnel who receive keys, access cards, or lock combinations that provide access to government-owned property shall comply with key and lock control procedures of the RA.

3. Pre-screen candidates using E-Verify Program: Contractors shall comply with the requirements set forth in FAR clause 52.222-54 Employment Eligibility Verification and FAR Subpart 22.18 in using the E-Verify Program at (https://www.e-verify.gov/) (website subject to change) to meet the contract employment eligibility requirements.

Contractors are encouraged to cooperate with Federal and State agencies responsible for enforcing labor requirements to include eligibility for employment under United States immigration laws in accordance with FAR 22.102-1(i). An initial list of verified/eligible candidates shall be provided to the COR no later than three business days after the initial contract award. When contracts are with individuals, the individuals will be required to complete a Form I-9, Employment Eligibility Verification, and submit it to the Contracting Officer to become part of the official contract file.

PERIOD OF PERFORMANCE:

The performance period for each awarded task should start 3 weeks after award.

Exercised tasks shall be completed 1 month after award of contract.

Flexibility is requested with the exact dates due to the unpredictably of field work, primarily due to adverse weather conditions; the Impact Explosion and Effects Branch (IEEB) will confirm each date with the contractor no later than two weeks prior to the need.

Period of Performance for the contract will be 08 AUG 2025 – 07 AUG 2028.

PLACE OF PERFORMANCE:

Big Black Test Site, Bovina Cutoff Rd, Vicksburg MS.

TESTING & QUALITY CONTROL:

The US Army Engineer Research & Development Center reserves the right to perform inspections and tests to ensure work completed is in compliance with contract specifications.

FURTHER NOTES

All workers will conform to Government safety regulations while working on site.

Appendix A. Bonding of Triple Brick

& CMU Block Target Walls