Transcript 2002 FDOT/FTBA Construction Conference QC 2000 Concrete Specifications Mike Bergin State Materials Office Email: [email protected] The Presentation will include Highlights of Changes to Section 346  A draft.

2002 FDOT/FTBA
Construction Conference
QC 2000 Concrete Specifications
Mike Bergin
State Materials Office
Email:
[email protected]
The Presentation will include
Highlights of Changes to Section 346
 A draft Resolution Procedure to assist
project personnel

April 3, 2002
2002 Construction Conference
2
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 2000
Specifications approved by FHWA.
April 3, 2002
2002 Construction Conference
3
What’s New in Section 346

New references to Section 6.8, 6.9 and 105
and reference to Chapter 9.2 in the
Materials Manual
 Section 6.8 -Quality Control Program
 Section 6.9 -Laboratory Qualifications
 Section 105 -Quality Control Program
Requirements
April 3, 2002
2002 Construction Conference
4
What’s New in Section 346
(cont.)

Chapter 9.2 of the Materials Manual (MM)
–Information pertaining to concrete plants.
April 3, 2002
2002 Construction Conference
5
What’s New in Section 346
(cont.)
Changes in almost every subsection.
 This presentation will focus on the major
changes and how these changes affect
Construction and Materials.
 Especially the relation between
Construction and Materials, and the
Resolution Process

April 3, 2002
2002 Construction Conference
6
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 9.2
of the Materials Manual (MM), “Concrete
Production Facilities Guidelines” (CPFG) and
is located on the DOT website.

April 3, 2002
2002 Construction Conference
7
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
April 3, 2002
2002 Construction Conference
8
Standard Operating
Procedures,… is gone (cont.)
The Level II from the SOP has been moved
directly into Section 346.
 The Contractor describes how he will maintain
the quality of the concrete once it arrives at the
job site.

April 3, 2002
2002 Construction Conference
9
Mass Concrete (3.1)

Requires a Specialty Engineer to formulate,
implement, administer and monitor the
temperature control plan.
April 3, 2002
2002 Construction Conference
10
Mass Concrete (3.1)

Department no longer approves the plan but
accepts the Contractor’s proposed plan.
 The responsibility is the Contractor’s to ensure
that the plan meets the specification.
 Contractor’s QC Manager is responsible to
ensure the plan is followed during and after
placement.
 No concrete is placed unless there is an
accepted Mass Concrete plan
April 3, 2002
2002 Construction Conference
11
Sampling and Testing (5.1)

ASTM is now the standard for all concrete
tests except for following two FM’s
 early sampling of fresh concrete FM 5501
 testing of chlorides in hardened concrete
FM 5-516
April 3, 2002
2002 Construction Conference
12
Control of Quality (6.1)

The Contractor maintains one quality control plan
for his entire project.
 The guidelines are identified in Section 6.8.
 Section 5.6 of MM identifies QC information
for material producers
 He is responsible to identify how the quality of
material will be maintained.
 Failure to meet specifications or contract
documents voids that portion of the QC plan.
April 3, 2002
2002 Construction Conference
13
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
April 3, 2002
2002 Construction Conference
14
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 the
requirements of the specs.
April 3, 2002
2002 Construction Conference
15
Adding Water at the Placement
Site (7.7)

Contractor must perform a slump test
before any water is added to the load.
April 3, 2002
2002 Construction Conference
16
Plastic Concrete Sampling and
Testing (8)

The Contractor is responsible for ensuring
that plastic properties, determination of the
w/c ratio and compressive strength of
cylinders are in compliance with the
Specifications.
April 3, 2002
2002 Construction Conference
17
Plastic Concrete Sampling and
Testing (8)

Testing will be performed:
 by CTQP qualified technicians.
 on each lot of concrete from a random
load within that lot.
April 3, 2002
2002 Construction Conference
18
Plastic Concrete Sampling and
Testing (8)

A Lot is 50 yd3 or one days production
which ever is less except for:
 Pav’t – one lane mile or one days
production
 I Special –150 yd3 or one days production
 III Seal – Each placement
April 3, 2002
2002 Construction Conference
19
Plastic Concrete Sampling and
Testing (8)

The Department will randomly select 1 of
every 4 lots to compare QC with
Verification tests.
 Use a Random number generator
April 3, 2002
2002 Construction Conference
20
Plastic Concrete Sampling and
Testing (8)
3 consecutive lots or 5 lots in two days out
of tolerance (in the same mix) – the
Contractor will suspend production from
this plant.
 Department may perform independent
verification test any time.

April 3, 2002
2002 Construction Conference
21
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 the
Contractor, cast an additional “hold” cylinder.
 The “hold” cylinder will be used for resolution
if the QC tests do not compare with the
Verification tests.
April 3, 2002
2002 Construction Conference
22
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 750
psi with the Verification cylinders.
If QC does not compare within the 750 psi of
Verification then the Engineer will initiate the
Resolution Procedure.
April 3, 2002
2002 Construction Conference
23
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 100
yds3.
April 3, 2002
2002 Construction Conference
24
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 the
minimum strength is met and no payment is
made for that lot.
April 3, 2002
2002 Construction Conference
25
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

April 3, 2002
2002 Construction Conference
26
Resolution Procedure (9.5)
curing procedures
 initial
 final
 compressive strength testing
 cores may be required

April 3, 2002
2002 Construction Conference
27
Resolution Procedure (9.5)

“Hold” cylinders are tested within 7 days of
the 28-day strength tests.
April 3, 2002
2002 Construction Conference
28
Resolution Procedure (9.5)

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 4
lots, -Department pays for the Resolution
testing.
April 3, 2002
2002 Construction Conference
29
Resolution Procedure (9.5)

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.
April 3, 2002
2002 Construction Conference
30
Rest of Section 346 relatively
unchanged

Same requirements for
 Investigation of low strength concrete for
structural adequacy (10)
 Pay adjustments for low strength concrete
(11)
April 3, 2002
2002 Construction Conference
31
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.
April 3, 2002
2002 Construction Conference
32
XXXXXXXXXXX
XXXXXXXXXX
These are the hold cylinders from the same load of concrete
April 3, 2002
2002 Construction Conference
33
XXXXXXXXXXXXXXXXXXXXXX
April 3, 2002
2002 Construction Conference
34
The DRAFT Resolution
Procedure will be available on
the SMO website.
April 3, 2002
2002 Construction Conference
35
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 and
Verification test results.
April 3, 2002
2002 Construction Conference
36
After the Concrete is Placed:

When placement is completed, the plastic
property data should be entered into the 6
screen of the CQR system within one
working day of the concrete placement by
the Project Engineer’s designee.
April 3, 2002
2002 Construction Conference
37
After the 28 day Strength Tests
are completed

QC and Verification Labs should notify the
Project Engineer, or his designee of test
results on the first working day after testing
and;
 within 3 working days of obtaining the
data it should be entered into the 7 screen
of the CQR system
April 3, 2002
2002 Construction Conference
38
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

April 3, 2002
2002 Construction Conference
39
When QC and Verification do not
Compare

Notify your District Concrete Engineer
immediately
 He may initiate an IA review of QC and
Verification procedures
 He will notify the State Materials Office
April 3, 2002
2002 Construction Conference
40
Transport the “hold” cylinders to
the designated Resolution
laboratory:
Each sample is accompanied with a new C22 card, with all information included.
 The QC and Verification Laboratories will
enter a new 6 screen into CQR

April 3, 2002
2002 Construction Conference
41
The Resolution Laboratory will
enter the 7 screen data and
indicate the status of the
resolution samples under new
codes.
April 3, 2002
2002 Construction Conference
42
NEW CQR Codes for Resolution
Samples
RQ =Resolution confirms QC results or
both QC and Verification results
 RV =Resolution results confirm Verification
results
 RR =Resolution results do not confirm QC
or Verification results.

April 3, 2002
2002 Construction Conference
43
If you have any questions
concerning these new CQR codes
please contact:

Glen Mans in Certifications at the SMO
 (352) 337-3146
 SC 642-3146
 [email protected]
April 3, 2002
2002 Construction Conference
44
Thank You for your time and
attention - Any Questions?
April 3, 2002
2002 Construction Conference
45