CONCRETE

[:ru]Ко Икэда[:en]Ko Ikeda[:] [:ru]Почетный профессор Университета Ямагучи, Япония[:en]Professor Emeritus of Yamaguchi University, Japan[:]

[:ru]Акира Микуни[:en]Akira Mikuni[:] [:ru]Промышленно-Технологический Институт префектуры Ямагучи, Япония[:en]Yamaguchi Prefectural Industrial Technology Institute, Japan[:]

Alitinform №3-4 (04-05) 2008 г. 72-82 p.

Abstract

Primarily, geopolymer techniques possessing high potential countermeasures for the both of carbon dioxide emission and waste management issues have been reviewed in view of silicate inorganic polymers called geopolymers, specifically in relevance to the chemistry. Then, applications to preparing cementitious materials have been introduced. In addition, beneficial utilizations of powdery wastes as geopolymer fillers have been mentioned.

Back ground setting

Recently the green house effect of the earth as well as the waste management of daily life is becoming global and social issues and so urgent countermeasures to coop with these issues are required to mankind. As shown in Table 1 there are several gases contributing to the green house effect. The contribution factor of each gas is more important than the share of each gas, ranging from 1 to 310 and more. Although carbon dioxide has only unity factor, this gas is regarded to be a most harmful gas to the green house effect presumably due to its large share. Readers are kindly requested to refer to other literatures for more details of the green house effect, for instance [1], together with the Kyoto protocol, COP3 in 1996, targeting 6% reduction of CO2 emissions in the world. In heavily inhabited countries the waste management issue is also a problematic matter. As shown in Fig. 1 open seas have long been used to discard so many kinds of waste in Japan where the land dumping yards are limited like as most European countries. However, this type of dumping is banned by London protocol in 1995 declaring prevention of sea waters from contamination. Meanwhile, on the other hand, foot light has been cast on the novel technique called «the geopolymer technique», which has a world wide potential to solve these two big issues simultaneously in the field of cement productions and applications.