Alkali-activated materials

Geopolymer concrete: A review of some recent developments

A review of the multi-component utilisation of coal fly ash

Advances in understanding alkali-activated materials

The development of new, sustainable, low-CO2 construction materials is essential if the global construction industry is to reduce the environmental footprint of its activities, which is incurred particularly through the production of Portland cement. One type of non-Portland cement that is attracting particular attention is based on alkali-aluminosilicate chemistry, including the class of binders that have become known as geopolymers. These materials offer technical properties comparable to those of Portland cement, but with a much lower CO2 footprint and with the potential for performance advantages over traditional cements in certain niche applications. This review discusses the synthesis of alkali-activated binders from blast furnace slag, calcined clay (metakaolin), and fly ash, including analysis of the chemical reaction mechanisms and binder phase assemblages that control the early-age and hardened properties of these materials, in particular initial setting and long-term durability. Perspectives fo...

Geopolymers and Related Alkali-Activated Materials

A pilot study for retrospective evaluation of cured-in-place pipe (CIPP) rehabilitation of municipal gravity sewers

http://mmahdikhani.persiangig.com/Nano/Haile_2010_Corrosion-Science.pdf

Evaluation of the bactericidal characteristics of nano-copper oxide or functionalized zeolite coating for bio-corrosion control in concrete sewer pipes

This report presents the findings of the first two phases of Strategic Highway Research Program 2 (SHRP 2) Project R01: Encouraging Innovation in Locating and Characterizing Underground Utilities. The project identified existing and emerging technologies and developed recommendations for subsequent research in this area. The report provides a thorough and insightful review of locating practices, current and emerging technologies, and recommended improvements. A third phase was added to this project to develop software to serve as decision support for identifying effective utility-locating methods for particular site or project environments. The software will expand on capabilities already developed under the R01 project.

Encouraging Innovation in Locating and Characterizing Underground Utilities

Concrete pipes represent the backbone of the wastewater collection systems in many cities across North America. These pipes are in various stages of deterioration, generally due to microbiological induced corrosion and/or mechanical loading. A common method of rehabilitating these structures is the use of cementitious coatings. This paper describes the development and testing of three novel geopolymer mix designs prepared using metakaolin and fly ash (class C and F) precursors. Specimens prepared using Portland cement-silica fume blend were also tested for comparison purposes. The specimens were placed in several concentrations of sulphuric acid for a period of eight weeks. The corrosion resistance and remaining compressive strength of geopolymer mortar made from class F fly ash precursor were found to be substantially higher compared with the enhanced OPC formulation. The other geopolymer mix designs were found to perform equally or better compared with the OPC binary blend.

Erez N. Allouche

Papers

A pilot study for retrospective evaluation of cured-in-place pipe (CIPP) rehabilitation of municipal gravity sewers

Evaluation of the bactericidal characteristics of nano-copper oxide or functionalized zeolite coating for bio-corrosion control in concrete sewer pipes

Encouraging Innovation in Locating and Characterizing Underground Utilities

Evaluation of the potential of geopolymer mortar in the rehabilitation of buried infrastructure

Evaluation of the resistance of mortars coated with silver bearing zeolite to bacterial-induced corrosion