Concrete Admixtures & Concrete Curing Compounds (CADD/CCC)

Concrete admixtures are used to improve the behavior of concrete under various conditions. Chemical admixtures reduce the cost of construction, modify properties of hardened concrete, ensure quality of concrete during mixing, transporting, placing, and/or curing, and overcome certain emergencies during concrete operations.

Concrete curing compounds consist of waxes, natural and synthetic resins, and water or a solvent carrier. Membrane-forming curing compounds are used to retard or reduce evaporation of moisture from fresh concrete. They are either clear/translucent or white pigmented.​

The work plans can be found by clicking on the Documents tab above.

NTPEP Designated Labs:

CADD:

  • American Engineering Testing, Inc.
  • SGS TEC Services

CCC:

  • Minnesota Department of Transportation

NTPEP - Concrete Admixtures & Concrete Curing Compounds


Committee Name:
NTPEP-Technical Committee on Concrete Admixtures and Curing Compounds
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Work Plan

NTPEP tests products according to a Project Work Plan, which describes the laboratory and/or field test protocols used to conduct the evaluation. The Project Work Plan is a consensus-based document and includes peer review and input from industry experts. Each Project Work Plan is adopted after receiving at least two-thirds affirmative support from 52 AASHTO member states. The Project Work Plan is the basis for host states to conduct their testing and evaluation. When implemented by state DOTs, their own state standard specifications may supersede the NTPEP Project Work Plan. Industry is advised to be aware of state-level requirements, which may supersede basic NTPEP testing.

Work Plan for Evaluation of Concrete ​Admixtures

Work Plan for Evaluation of Concrete Curing Compounds​

User Guide for Concrete Admixtures

User Guide for Concrete Curing Compounds

Please go to NTPEP DataMine.

Please go to NTPEP DataMine.

Industry Resources

Companies or associations that would like to be affiliated with the NTPEP Concrete Admixtures or Concrete Curing Compounds program should contact the liaison for additional information.

Concrete Admixtures (CADD)

Overview

  • This evaluation consists of laboratory
  • Testing is based on AASHTO M 194, “Standard Specification for Chemical Admixtures for Concrete.”
  • The evaluation protocol for liquid chemical admixtures shall be as per AASHTO M
  • The evaluation protocol for air entraining agents is AASHTO T 157, “Standard Method of Test for Air-Entraining Admixtures for Concrete.”
  • CADD evaluations consist of:
    • Level 1 – Provides testing needed to verify compliance with AASHTO M
    • Level 2 – Uniformity and equivalence testing that can be used to verify that a product formulation has not changed since the Level 1 testing was performed. Level 2 testing is performed within 5 years of the Level 1 evaluation or if the product name has
  • Products are tested every 5
  • Dry Cast Admixtures and Corrosion inhibitors will be accepted by the technical committee for Level 2 testing
  • Specialty Admixtures (Type S) will be tested using the standard evaluation protocol without evaluating special properties.

 

Links

Additional information on this evaluation can be found at: http://www.ntpep.org/Pages/CADD.aspx

AASHTO National Transportation Product Evaluation Program (NTPEP) www.ntpep.org

AASHTO NTPEP DataMine https://data.ntpep.org/

 

Success Stories

Wesley Glass re: CADD

Kentucky Transportation Cabinet

Division of Materials

“They (Kentucky Transportation Cabinet) accept CADD by cert and NTPEP alone. They do an IR scan for comparison and do perform their own chloride test.  They do no physical (performance) testing. “

Sample Specifications

    • Alabama procedure for evaluation of CADD
    • Alabama spec for CADD
    • Kansas DOT Specification for Chemical Admixtures for Concrete
    • South Carolina Qualification Policy for Concrete Admixtures

 



Concrete Curing Compounds (CCC)

Overview

  • The evaluation consists of laboratory
  • Testing is based on ASTM C309, “Standard Specification for Liquid Membrane-Forming Compounds for Curing ”
  • Testing includes:
    • AASHTO T 155, “Standard Method of Test for Water Retention by Liquid
      • Membrane-Forming Curing Compounds for Concrete.”
    • Minnesota DOT “Three-Day Settlement ”
    • ASTM D93, “Standard Test Method for Flash Point by Pensky-Martens Closed Cup Tester”
    • Fourier Transform Infrared Spectroscopy (FTIR) Scan
  • Products are submitted for retesting every 3 years.


Links

Additional information on this evaluation can be found at: http://www.ntpep.org/Pages/CADD.aspx

AASHTO National Transportation Product Evaluation Program (NTPEP) www.ntpep.org

AASHTO NTPEP DataMine https://data.ntpep.org/


Success
Stories

Wesley Glass re: CCC

Kentucky Transportation Cabinet

Division of Materials

“Prior to NTPEP they (Kentucky Transportation Cabinet) did limited testing on CCC.  Addition of products to the List of Approved Materials is now based solely on certification and NTPEP testing, the additional testing provided by NTPEP provides greater confidence.”


Andrew Thaxton

West Virginia DOT

Andrew.M.Thaxton@wv.gov

Re: West Virginia DOT use of NTPEP for qualification of Concrete Curing Compounds (CCC)

I think NTPEP has allowed us to free up some agency resources. With tight budgets and little time NETPEP has proven to be a valuable asset with product evaluation. It is a trusted source of information for products we use such as curing compounds.


Sample Specifications

  • Florida spec for Curing Materials for Concrete
  • Kansas Specification for Liquid Membrane Forming Compounds
  • Tennessee procedure for evaluation of curing compounds