ASTM C1656-13
Standard Guide for Measuring the Reactivity of Hydraulic Refractory Castables using Exothermic Profile

Standard No.

ASTM C1656-13

Release Date

2013

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM C1656-13(2018)

Latest

ASTM C1656-13(2023)

Scope

4.1 The heat of hydration of a calcium aluminate based castable is liberated over a short period of time (as compared to Portland cement). This makes it easy to measure the heat profile using off-the-shelf thermocouple equipment.

4.2 The heat profile can be used to make inferences about the setting and strength gain behavior of a castable and sometimes the working time of a castable.

4.3 Factors that should be controlled when comparing two castables include: size, shape and mass of cast object, start temperature of the mix, temperature of environment, and the thermal conductivity of the environment. If these factors are held constant, then the two castables heat profiles can be compared.

4.4 The temperature increase created by the castable exothermic reaction shall be at least 2.0°C more than the normal fluctuation of the laboratory temperature so that the time of this increase is easily discernible to the user.

4.5 Varying the amount of cement in the castable, the amount of water, the type and quantity of admixtures, and so forth, will change the shape, maximum temperature and time to maximum temperature of the curve.

4.6 Following is an example of a curve generated for an LCC (see Fig. 1) that does exhibit two peaks, the first one marking the end of working time. In this curve one could also infer that the start temperature of the mix was 24°C and also that the hydraulic strength gain reaction was significantly started, but not completed by 6 h.

1.1 This guide applies to all castables with a reactive binder system that produces a measurable heat profile during the setting and hardening process. The majority of these systems will have calcium aluminate cement as one component of the binder system.

1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use .

ASTM C1656-13 Referenced Document

• ASTM C401 Standard Classification of Alumina and Alumina-Silicate Castable Refractories
• ASTM C71 Standard Terminology Relating to Refractories
• ASTM C862 Standard Practice for Preparing Refractory Concrete Specimens by Casting

ASTM C1656-13 history

• 2023 ASTM C1656-13(2023) Standard Guide for Measuring the Reactivity of Hydraulic Refractory Castables Using Exothermic Profile
• 2018 ASTM C1656-13(2018) Standard Guide for Measuring the Reactivity of Hydraulic Refractory Castables Using Exothermic Profile
• 2013 ASTM C1656-13 Standard Guide for Measuring the Reactivity of Hydraulic Refractory Castables using Exothermic Profile
• 2007 ASTM C1656-07 Standard Guide for Measuring the Reactivity of Hydraulic Refractory Castables using Exothermic Profile