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Develop a Simple and Rapid Test for Monitoring the Heat Evolution of Concrete Mixtures for both Laboratory and Field App

Objectives. Simple test procedures for cement and concrete heat evolutionRational method for interpretation of the test resultsPerformance based specifications for the testsModels for predicting heat evolution of cement based on concrete materials and mix proportions. To Develop:. Phase Iliterature survey Phase II Study on Cementitious MaterialsPhase III Study on Concrete Materials.

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Develop a Simple and Rapid Test for Monitoring the Heat Evolution of Concrete Mixtures for both Laboratory and Field App

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    2. Objectives Simple test procedures for cement and concrete heat evolution Rational method for interpretation of the test results Performance based specifications for the tests Models for predicting heat evolution of cement based on concrete materials and mix proportions

    3. Phase I literature survey Phase II Study on Cementitious Materials Phase III Study on Concrete Materials Approach

    4. Investigations in Phase I Factors affecting the concrete heat evolution Existing devices and test methods for heat evolution measurement Existing models for predicting heat of hydration Needs and potential applications of calorimeter tests

    5. Existing Heat Evolution Tests (Semi-)Isothermal calorimeter (Semi-)Adiabatic calorimeter Dewar test (ISU) Coffee cup (Holcim) Sprayed-foam basket (Lafarge)

    6. Potential Applications of Heat Evolution Tests Characterize futures of cementitious materials Verify concrete mix proportions Identify incompatibility problems Predict concrete setting time Assess pavement sawing/finishing time Specify curing period Estimate risk of thermal cracking Select materials and mix designs

    8. Tests for Admixture Overdose

    9. Tests for Cement Characteristics

    10. Tests for Admixture Dosages and Incompatibility

    11. Tests for Effects of Delayed Addition of Admixtures

    12. Tests for Effects of Placement and Curing Temperatures

    14. Phase II Proposal Phase II – Part A (Nov. 2005 – June 2006) Select the equipment and conduct lab experiments to provide fundamental information for criteria and test procedure development. Establish heat evolution indexes to characterize concrete materials. Phase II – Part B (April 2006 - September 2007) Predict concrete performance using heat evaluation indexes and HIPERPAV program. Develop performance-based specification for calorimeter equipment and test procedures. Conduct field study of the newly-developed calorimeter tests.

    15. Phase II: Equipment Selection (TAM Air Calorimeter) Isothermal calorimeter Able to capture initial heat Eight channels Small sample Less labor intensive Good accuracy More reproducible About $8,000

    17. Collaboration with MCO Project Evaluate heat evolution behavior of the field cementitious materials Characterize heat evolution curves obtained from the MCO field projects using the heat indexes Utilize the developed model to predict heat evolution of cementitious materials

    18. Trial Application of Heat Index in MCO Project Test Results

    19. Phase II: Intended Results A set of criteria for calorimeter equipment selection and development Test Procedures for evaluation the heat of hydration of cementitious materials and admixtures A set of indexes for characterization of heat evolution curves Initial models and software that are capable of converting the raw test data into easily understood test results A draft of an AASHTO specification for the recommended test method

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