Architecture：Clay-Based Construction Products.pdfVIP

491 12 Clay-Based Construction Products 1.0 INTRODUCTION The performance of clay-based construction products, e.g., bricks and roofing tiles, can be monitored using thermal methods. The types of raw materials, viz., clay and accessory minerals, and their reactions that occur during the firing process and the durability of clay products can be examined through the application of DTA, TG, TMA, and dilatometric methods. This is particularly important for quality control as physical and chemical behaviors are dependent on the raw material characteristics, e.g., composition, particle size, and morphology. This chapter focuses on the application of thermal methods specific to raw materials suitable for industrial clay products that are suitable for brick-making. Details of thermal processes for the following materials are discussed: singular, binary, and ternary clay-based systems; structural ceramics; solid waste in clay bricks; significant archaeological clay prod- ucts; and brick clay products from Central Europe. 491 492 Chapter 12 - Clay-Based Construction Products The durability of clay bricks to freezing-thawing cycles is also presented. Emphasis is placed on the use of thermal methods, e.g., dilatom- etry to determine the factors that contribute to freezing-thawing resistance. A method for determining the firing temperature characteristics of clay brick is presented. The use of brick particulate additives to portland cement concrete for enhancement of freezing-thawing resistance and the applica- bility of thermal techniques to assess the bloatability of clays is also described. 2.0 THERMAL BEHAVIOR AND IDENTIFICATION OF CLAYS AND ACCESSORY MINERALS 2.1 DTA of Clay Minerals