APPLICATIONS THAT REQUIRE A CORRECTION BEFORE THE MATURITY CONCEPT IS APPLIED
Many material properties in cementitious systems develop over time. The rate of thisproperty development depends on the temperature of the system. Researchers in the 1950spromoted the use of a maturity index that could account for the combined effects of timeand temperature on property development. Over the last five decades, the concrete communityhas extensively used maturity methods to predict strength development. While the maturitymethod has great practical importance, this paper examines the applicability of the maturitymethod in several cases. The authors suggest that, although measured properties can be fittedto equations that have the form of a maturity function, fundamental aspects of the maturitymethod or measured property are frequently overlooked when this is done. Specifically, thispaper discusses three applications that require additional interpretation before the maturitymethod can be applied. These applications include: 1) application to a composite materialwhere the mode of failure changes as constituent materials develop at different rates, 2)application to electrical property measurements which require a temperature correction beforethe maturity method is applied, and 3) application to system responses (rather than materialproperties) where time-dependent material responses need to be considered (e.g., varyingrestraint or viscoelasticity). The results indicate that in cases where proper corrections areapplied a consistent activation energy can be used in prediction of material propertydevelopment. This has specific implications for computer simulations which aim to predictfield concrete performance.
G.Sant J.Weiss
Purdue University,West Lafayette,Indiana,USA
国际会议
南京
英文
765-774
2008-10-13（万方平台首次上网日期，不代表论文的发表时间）