Title:
Laboratory-Made RCC containing Dry Bottom Ash: Part I—Mechanical Properties
Author(s):
Nader Ghafoori and Yuzheng Cai
Publication:
Materials Journal
Volume:
95
Issue:
2
Appears on pages(s):
121-130
Keywords:
bottom ash; compaction; compression; drying shrinkage; flexure;
modulus of elasticity; splitting-tension;
DOI:
10.14359/357
Date:
3/1/1998
Abstract:
The behavior of laboratory-made roller compacted concretes (RCC) containing pulverized coal combustion high-calcium dry bottom ash as a fine aggregate was investigated. Standard concrete samples of 9 different mixture proportions (cement contents ranging from 9 to 15 percent, and coarse aggregate contents of 50, 55, and 60 percent by mass of total dry solids) were prepared at the optimum moisture content and consolidated in accordance with the requirements of ASTM C 1170, Procedure A. The concrete specimens were water-cured at different ages, up to six months. This paper presents the fresh properties and strength, stiffness, and deformation characteristics of hardened bottom ash roller compacted concretes. Their long- term durability will be discussed in Part II of this article. Test results conclude that RCC samples containing dry bottom ash offer excellent strength, stiffness, and deformation properties, considering the range of cement factors used. For the mixtures under investigation, the compressive strength, splitting-tensile resistance, flexural strength, and modulus of elasticity varied from 2439 to 7222, 374 to 726, 567 to 1103 psi, and 3033 to 5539 ksi, respectively. The year-old drying shrinkage strain ranged between 203 × 10-6 and 298 × 10-6.