Here, the authors demonstrate the feasibility of industrial application of low carbon supplementary cementitious materials (i.e. geopolymer concrete) by investigating the durability performance of eight years aged reinforced geopolymer concrete structure exposed to ambient environment.
Due to the increasing rates of urbanisation and the ever growing urban population, it is inferable that the demand on multi-story construction industry will continue to increase. In Australia, having an urban population of approximately 21 million, equivalent to 90% of the total population, the construction industry is a key driver and contributes to approximately 7.8% of the country’s GDP in value added terms, where issues regarding quality control, reduced workplace productivity, onsite safety, skilled labour shortages, rising costs and environmental impacts are of great concern.
This study investigates the durability of precast fly ash–based geopolymer concrete (GPC) exposed to an outdoor atmospheric environment for 8 years. Core specimens from GPC culverts are tested to determine the effect of carbonation, permeation properties, and poresize distribution, and the durability is compared with that of ordinary portland cement (OPC) concrete from the same exposure environment. It is found that the GPC has lower carbonation resistance than OPC concrete.
Carbonation of geopolymer concrete exposed to atmospheric environment was investigated.
The mix compositions of geopolymer concrete was influenced on the carbonation rate in atmosphere.
The presence of carbonation reaction components was identified by TGA and FTIR analysis.
MIP analysis test results was providing a good correlation with carbonation depth values.
In this paper, the characteristic requirements for inter-module connections with regard to structural and functional needs are identified and presented. An overview into few key aspects regarding multi-story modular building construction is also discussed.
Modular buildings are those built using prefabricated volumetric units called modules. Due to modules being connected to each other at discrete locations, discontinuous structural systems are formed, where diaphragm discontinuity is a key issue and could result in diaphragms that are flexible. Multi-story modular buildings with flexible diaphragms are susceptible to higher mode influences when under the action of seismic loads, where such influences affect lateral load distribution, cause excessive drift among gravity frames and could potentially lead towards collapse.
A major barrier to the adoption of Geopolymer concrete in construction is the lack of long-term performance data. Field testing has been undertaken to determine the behaviour of geopolymers in different service environments and address the gaps in knowledge. The University of New South Wales (UNSW Sydney) and Swinburne University of Technology (SUT) undertook field testing at sites to examine durability aspects including carbonation, chloride ingress, reinforcement corrosion and acid attack.