DEVELOPMENT OF QUALITY-CONTROL TESTING OF CEMENT（PART 2） SIMPLE AND LESS EXPENSIVE TRISTIMULUS COLORIMETER FOR THE IDENTIFICATION OF CEMENTS

Abstract

Cements and admixtures have their specific colors. Within a particular factory or construction site, kinds of the cement used are limited；therefore, it is possible to identify the types of the cements and/or to determine the contamination of them by simply measuring the color of cements. In the present work, we have developed a portable and generic tristimulus colorimeter for field use and it was applied to the identification of cements. As the results, four kinds of cements, such as ordinary portland cement, moderate-heat portland cement, portland blast-furnace slag cement, and ecocement could be clearly discriminated by this colorimeter. Furthermore, additives such as blast-furnace slag and limestone were successfully determined by the colorimeter with 5％ precision. The time required to measure the color of cement samples is only 5min and its rapidity and simple operation are highly suitable for the quality control of cement on site.