INVESTIGATION ON ALKALI-SILICA REACTION UTILIZING
WASTE GLASS IN CONCRETE
AND SUPPRESSION EFFECT BY NATURAL ZEOLITE
29th Our World in Concrete and Structures (OWICs) - 2004
R. Takata*, Matsue National College of Technology, Japan
S. Sato, Shimane University, Japan
T. Nonaka, Shimane University, Japan
H. Ogata, Tottori University, Japan
K. Hattori, Tottori University, Japan
In Japan, legal systems for recycling of industrial waste have almost completed for
the purpose of effective use of resource management, and multiple researches for the
development of new use on industrial by-products have been started at various fields
Up to now, waste glass was thought it difficult to use for the materials of concrete due
to the danger of alkali aggregate reaction, as the chemical components of waste glass
contain much amounts of active-silica, what we call the "Alkali-Silica reaction (ASR).
However, past studies showed this reaction was affected by not only the amount of waste
glass mixing in concrete but also the grain size of waste glass.
In this research, alkali-reactivity and suppression method of waste glass are
investigated with mortar-bar test method. Firstly, the influence of replacing amount and
grain size distribution 0 f waste g lass are tested with making various types 0 f mortars.
From this test results, it is confirmed that the waste glass showed high alkali-reactivity due
to the mixing amounts of waste glass, the pessimum content ratio of waste glass is almost
80% against cement weights. It is also clarified that expansion property changed due to
the grain size of waste glass, suggested that the pessimum grain size is about 2mm.
These two methods, controlling the water as well as the adsorption of alkali ion, are
thought to be effective for the suppression of ASR. Then, natural zeolite that has cation
exchange ability is mixed with mortar as admixture and aggregate, and suppressing effect
of natural zeolite against ASR is tested using various types of mortar contained different
amount of natural zeolite. From this result, natural zeolite shows high preventive effect
when using it as both admixture and aggregate substitution for concrete.