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• W2894828663 abstract "The utilization of Portland cement as a construction material is unsustainabledue to the huge amount of CO2 emissions coupled with the high energy demand duringits production. New innovations in low impact construction materials require areduction in the use of Portland cement with alternative binders, preferably utilisingindustrial waste materials and aggregates made from recycled waste. Alkali activatedcementitious materials (AACMs) shows potential benefits when used in place ofPortland cement in the construction industry. However, market forces mitigating againstthe acceptance of AACMs are fomidable. This is partly because of the limitedknowledge of the in-service life of AACM concrete, which is linked to the inadequatedurability investigations available in literature. This research project investigates the durability properties of AACM concreteby exposing it to deleterious substances that cause deterioration and damage toreinforced concrete structures. The durability properties of AACM concrete wereinvestigated under long term exposure to chloride and CO2 environments which are thetwo main corrosion initiators in reinforced concrete structures. Four series of AACMconcrete mixes were studied with a parallel OPC concrete mix used for the comparativeanalysis. Mix parameters investigated in the research included factors such as activatordilution and liquid/binder ratios which are given in relevant chapters. Chapter 1 provides an Introduction to the thesis. Chapter 2 gives an overallLiteraure Review and also provides information on the materials used in the research. Achapter specific literature review is given at the start of each chapter. The third chapterpresents the investigation of the microsrtucture of AACM and OPC mortar mixes whichshows that AACM mortar has less porosity than OPC mortar. However, a greatercapillary pore volume was observed in AACM mortar than OPC mortar but the reversewas the case for gel pore volume. The fourth and fifth chapters investigate thephysically bound, chemically bound and free chloride concentrations in both AACMand OPC concrete. The results show a lower degree of physically and chemically boundchlorides but a higher degree of free chloride in AACM concrete compared with OPCconcrete. The free chloride/hydroxyl ion ratio which is an index for corrosion initiationin concrete is lower in AACM concrete than OPC concrete due to the higher pH of theformer. The sixth chapter investigates the carbonation in AACM and control OPCconcrete. The depth of carbonation is higher in AACM concrete than OPC concrete butthe phenolpthlain test method has limitations for use in AACMs. Investigations on thepH of carbonation specimens gave a greater insight to carbonation in AACMs. Theinfluence of mix design parameters of AACMs are reported in each chapter 3, 4, 5 and 6.The seventh chapter reports the monitoring of the corrosion activity of steel reinforcingbars embedded in AACM and OPC concrete until 860 days of cyclic exposure in a 5%NaCl solution and air. The corrosion potentials and current densities were higher inAACM concrete than OPC concrete under wet cycles, which is likely due to theinsufficient oxygen concentration at the steel interface. The visual inspection of thereinforcing steel bars in AACM and OPC concrete to detect when corrosion begins willconfirm the insufficient oxygen concentration at the steel interface. Generally, AACM concrete shows better durability properties than OPCconcrete except the carbonation aspect which requires further investigation. Thelikehood that the phenolpthalein indicator method which is a standard testing methodfor carbonation of OPC concrete might not be suitable for AACM concrete." @default.
• W2894828663 created "2018-10-12" @default.
• W2894828663 creator A5062712815 @default.
• W2894828663 date "2018-02-28" @default.
• W2894828663 modified "2023-09-26" @default.
• W2894828663 title "Durability Properties of an Alkali ActivatedCementitious Material" @default.
• W2894828663 hasPublicationYear "2018" @default.
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