qc 2000 concrete presentation

7/28/2019 Qc 2000 Concrete Presentation

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2002 FDOT/FTBAConstruction Conference

QC 2000 Concrete Specifications

Mike Bergin

State Materials OfficeEmail:

[email protected]


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April 3, 2002 2002 Construction Conference 2

The Presentation will include

Highlights of Changes to Section 346

A draft Resolution Procedure to assist

project personnel


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QC 2000

Is not NEW any more

But the specs have changed and the major

changes will be addressed today.

Jobs have been let under QC 2000 for

several years, as of July 1, 2002 all

FDOT projects will be let with QC 2000Specifications approved by FHWA.


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Whats New in Section 346

New references to Section 6.8, 6.9 and 105

and reference to Chapter 9.2 in the

Materials ManualSection 6.8 -Quality Control Program

Section 6.9 -Laboratory Qualifications

Section 105 -Quality Control Program

Requirements


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(cont.)

Chapter 9.2 of the Materials Manual (MM)

Information pertaining to concrete plants.


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(cont.) Changes in almost every subsection.

This presentation will focus on the major

changes and how these changes affectConstruction and Materials.

Especially the relation between

Construction and Materials, and theResolution Process


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Standard Operating Procedures for

the Quality Control of Concrete(SOP) is gone

The Level I of the SOP identified how

producers batched concrete to meet the

requirements of the Specification.

This information is now moved to Chapter 9.2of the Materials Manual (MM), Concrete

Production Facilities Guidelines (CPFG) and

is located on the DOT website.


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Standard Operating

Procedures, is gone (cont.) MM Includes the requirements for batch plants

such as:

Plant specific QC plan QC plan no longer job specific

Design mix requirements (change)

Hot weather,old 346, mix temp is 94 F at

the end of the mixing cycle Hot weather, new 346, mixes are held at

94 F during entire mixing cycle


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Standard OperatingProcedures, is gone (cont.)

The Level II from the SOP has been moveddirectly into Section 346.

The Contractor describes how he will maintainthe quality of the concrete once it arrives at the

job site.


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Mass Concrete (3.1)

Requires a Specialty Engineer to formulate,

implement, administer and monitor the

temperature control plan.


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Mass Concrete (3.1)

Department no longerapproves the plan butacceptsthe Contractors proposed plan.

The responsibility is the Contractors to ensurethat the plan meets the specification.

Contractors QC Manager is responsible toensure the plan is followed during and after

placement.No concrete is placed unless there is an

accepted Mass Concrete plan


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Sampling and Testing (5.1)

ASTM is now the standard for all concrete

tests except for following two FMs

early sampling of fresh concrete FM 5-501

testing of chlorides in hardened concrete

FM 5-516


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Control of Quality (6.1)

The Contractor maintains one quality control planfor his entire project.

The guidelines are identified in Section 6.8.

Section 5.6 of MM identifies QC informationfor material producers

He is responsible to identify how the quality ofmaterial will be maintained.

Failure to meet specifications or contractdocuments voids that portion of the QC plan.


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Delivery Certification of

Concrete (6.3) Delivery ticket requirements have been

moved to the Concrete Production Facility

Guidelines, Chapter 9.2 of the MM.Batch Plant Operator (BPO) signs stating

that the batch was produced in

accordance with the approved design mix


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Delivery Certification of

Concrete (6.3) The Contractor or his agent signs stating the

W/C ratio was not exceeded at the project

site and that the concrete meets therequirements of the specs.


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Adding Water at the Placement

Site (7.7)

Contractor must perform a slump test

before any water is added to the load.


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Plastic Concrete Sampling and

Testing (8) The Contractor is responsible for ensuring

that plastic properties, determination of the

w/c ratio and compressive strength ofcylinders are in compliance with the

Specifications.


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Testing (8) Testing will be performed:

by CTQP qualified technicians.

on each lot of concrete from a random

load within that lot.


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Testing (8) A Lot is 50 yd3 or one days production

which ever is less except for:

Pavt one lane mile or one daysproduction

I Special150 yd3 or one days production

III SealEach placement


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Testing (8) The Department will randomly select 1 of

every 4 lots to compare QC with

Verification tests.Use a Random number generator


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Testing (8) 3 consecutive lots or 5 lots in two days out

of tolerance (in the same mix)the

Contractor will suspend production fromthis plant.

Department may perform independent

verification test any time.


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Acceptance Sampling and

Testing (9.1) Contractor will cast a set of 3 cylinders from each

lot, from a random load within the lot

For each lot that the Department verifies with theContractor, cast an additional hold cylinder.

The hold cylinder will be used for resolution

if the QC tests do not compare with the

Verification tests.


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Acceptance Sampling and

Testing (9.1) The laboratory performing the compressive

strength tests shall meet the requirements of

Section 6-9 The concrete is verified when the Contractors

quality control (QC) cylinders compare within 750psi with the Verification cylinders.

If QC does not compare within the 750 psi ofVerification then the Engineer will initiate theResolution Procedure.


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Reduced Frequency for

Acceptance Tests (9.2.1) If the Contractor can show consistency in

his QC tests, the sample frequency can be

reduced and lot size will be increased to 100yds3.


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Acceptance of Hardened

Concrete (9.4) When 1 of the 3 QC cylinders are lost, damaged or

destroyed,

Average the remaining 2 cylinders and payment

for the lot is reduced by 10% When more than 1 of the QC cylinders is lost,

damaged, or destroyed

The contractor, at the discretion of the engineer,

will core the structure to determine if theminimum strength is met and no payment ismade for that lot.


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Resolution Procedure (9.5)

Is initiated when QC and Verification do

not compare.

The Department may initiate an

Independent Assurance (IA) review of:

plastic properties

calculation of w/c ratio

handling of cylinders


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curing procedures

initial

final

compressive strength testing

cores may be required


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Hold cylinders are tested within 7 days of

the 28-day strength tests.


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Concrete is accepted based on the strength test

results deemed by the Department to be the most

accurate If Verification is the most accurate, then

Verification represents the 4 lots, -Contractor

pays for the Resolution testing

If QC is the most accurate, QC represents the 4lots, -Department pays for the Resolution

testing.


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When the Department cannot determine that

either QC or Verification data is in error,the concrete representing the four lots will

be evaluated based on the results of the

resolution investigation.


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Rest of Section 346 relatively

unchanged

Same requirements for

Investigation of low strength concrete forstructural adequacy (10)

Pay adjustments for low strength concrete(11)


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State Materials Office Develops a

Resolution Procedure: The intent is to inform both Construction

and Materials personnel of a consistent

process in the event that Resolution is

needed on their projects.


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These are the hold cylinders from the same load of concrete

XXXXXXXXXXX XXXXXXXXXX


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XXXXXXXXXXXXXXXXXXXXXX


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The DRAFT ResolutionProcedure will be available on

the SMO website.


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In General the DRAFT

Resolution Procedure identifies

what is needed:

At start of project, the Project Engineer

should designate one person to;make data entrees and track cylinder

testing.

make the comparisons between QC andVerification test results.


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After the Concrete is Placed:

When placement is completed, the plastic

property data should be entered into the 6screen of the CQR system within one

working day of the concrete placement by

the Project Engineers designee.


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After the 28 day Strength Tests

are completed

QC and Verification Labs should notify the

Project Engineer, or his designee of testresults on the first working day after testingand;

within 3 working days of obtaining thedata it should be entered into the 7 screenof the CQR system


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CQR Codes

Verification Samples

V =Verification compares with QC

N =Verification did not compare with

QC

Project Engineer reviews the data and

verifies the comparison or non-comparison


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When QC and Verification do not

CompareNotify your District Concrete Engineer

immediately

He may initiate an IA review of QC andVerification procedures

He will notify the State Materials Office


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Transport the hold cylinders to

the designated Resolutionlaboratory: Each sample is accompanied with a new C-

22 card, with all information included.

The QC and Verification Laboratories will

enter a new 6 screen into CQR


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The Resolution Laboratory will

enter the 7 screen data and

indicate the status of theresolution samples under new

codes.


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NEW CQR Codes for Resolution

Samples RQ =Resolution confirms QC results or

both QC and Verification results

RV =Resolution results confirmVerification results

RR =Resolution results do not confirm QC

or Verification results.


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If you have any questions

concerning these new CQR codesplease contact:

Glen Mans in Certifications at the SMO

(352) 337-3146

SC [email protected]


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Thank You for your time and

attention - Any Questions?

qc 2000 concrete presentation

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