Abstract
This paper presents the research on properties of sintered fly-ash coarse aggregate produced by Dwight-Lloyd system and applicability of concrete containing this type of aggregate for structural lightweight concrete. A summary of the results are as follows. 1) The characteristic of this type of aggregate compared with expanded shale type one are that, first, there is no shell formed by melted glass, second, internal entrapped air voids are continues with each other. 2) Concrete containing this type of aggregate has eqaul mechanical properties to expanded shale type concrete, but, on the other hand, inferior durability to expandrdd shale type. However, it is able to improve by adding adequate addmixture. 3) This type of aggregate is suited to the request of society, such as conservation of resource and energy, and this type of concrete has an applicability as structural concrete. Therefore, it is expected to use effectively those as concrete materials.
