A. Allahverdi, E. Najafi Kani,
Volume 7, Issue 3 (9-2009)
Abstract
It has been shown that geopolymerization can transform a wide range of waste aluminosilicate materials
into building materials with excellent chemical and physical properties such as fire and acid resistance. In this
research work, geopolymerization of construction waste materials with different alkali-activators based on
combinations of Na2SiO3 and NaOH has been investigated. A number of systems were designed and prepared with
water-to-dry binder ratio, silica modulus, and sodium oxide concentration were adjusted at different levels and setting
time and 28-day compressive strength were studied. The results obtained reveal that construction wastes can be
activated using a proportioned mixture of Na2SiO3 and NaOH resulting in the formation of a geopolymer cement
system exhibiting suitable workability and acceptable setting time and compressive strength. Laboratory techniques of
Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) were utilized for studying
molecular and microstructure of the materials.
Jiuping Xu, Pei Wei,
Volume 10, Issue 1 (3-2012)
Abstract
In this paper, a location allocation (LA) problem in construction and demolition (C&D) waste management (WM) is studied. A bi-level model for this problem under a fuzzy random environment is presented where the upper level is the governments who sets up the processing centers, and the lower level are the administrators of different construction projects who control C&D waste and the after treatment materials supply. This model using an improved particle swarm optimization program based on a fuzzy random simulation (IPSO-based FRS) is able to handle practical issues. A case study is presented to illustrate the effectiveness of the proposed approach. Conclusions and future research directions are discussed.
