Introduction to Handbook of Alkali-activated Cements, Mortars and Concretes

Pacheco-Torgal, F.

doi:10.1533/9781782422884.1

Cited by 297 publications

(288 citation statements)

References 24 publications

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“…Despite all these, studies have not produced favorable results as the acid not only attack the hydrated and unhydrated cement, it decomposes any material that comes its way (Pacheco-Torgal et al 2014). However, there are reports suggesting alkali-activated binder as a reliable alternative in withstanding the harshness of its external environment for service life improvement.…”

Section: Introductionmentioning

confidence: 99%

POFA-Engineered Alkali-activated Cementitious Composite Performance in Acid Environment

Salami

Johari

Ahmad

et al. 2017

ACT

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The durability performance of palm oil fuel ash engineered alkali-activated cementitious composite (POFA-EACC) mortar exposed to different acid solutions is assessed in this study. 50 mm cubic specimens used for the study were prepared from 100% POFA, alkali-activator (Na 2 SiO 3(aq) /NaOH (aq) ) ratios of 2.5, different molarities (10, 12 and 14 M) of NaOH (aq) and 2% volume fraction of polyvinyl alcohol (PVA) fibres. Specimens were exposed to 10% H 2 SO 4(aq) , 10% HNO 3(aq) and 10% HCl (aq) at pH of 0.56, 0.52 and 0.42 respectively for 3, 6 and 9 months, with unexposed specimens as control. Small changes in compressive strength were identified with POFA mortar specimens during exposure to H 2 SO 4(aq) , while exposure to HNO 3(aq) and HCl (aq) greatly reduced the strength of the POFA mortar specimens. The results were supported through microstructural examinations using SEM, while the characterization was done using XRD and FTIR. The high resistance of POFA-EACC mortar to H 2 SO 4(aq) is the contribution received through the formation of gypsum, which hinders the infiltration of more acids into the matrix microstructure.

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Section: Introductionmentioning

confidence: 99%

POFA-Engineered Alkali-activated Cementitious Composite Performance in Acid Environment

Salami

Johari

Ahmad

et al. 2017

ACT

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“…In general terms, the AAMs are characterized by a good mechanical strength and durability against different aggressive agents [12,[15][16][17][18][19][20]. However, to date little is known on the physical behaviour of AAMs pastes as well as the intrinsic variability observed in rheological tests.…”

Section: Cmss-2017mentioning

confidence: 99%

Rheology of Cementitious Materials: Alkali-Activated Materials or Geopolymers

et al. 2018

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Abstract.A clear alternative to reach the goal of sustainable development in the Construction Sector is the development of alternative building materials to Ordinary Portland Cement (OPC) in a more energetically as well as environmentally eco-efficient way. Alkaline cements (Alkali-Activated Materials, AAMs) and geopolymers meet these requirements; and they are based on the alkali activation of aluminosilicates (mainly waste and industrial by-products, such as blast furnace slag, fly ash and ceramic waste) in highly alkaline solutions. AAMs cements and concretes are notable for being very durable and mechanically resistant. However, to date their rheological behaviour is not well controlled and there is little understanding of it, with very disparate experimental data. Despite this, their rheological behaviour is not fully understood and little is known on the disparate data obtained in AAM pastes. Moreover, the common additives used in the preparation of OPC concretes and the rheology modifiers/controllers are also unstable in the AAMs systems. Understanding and controlling the rheology of the AAMs systems will ultimately determine whether they can be implemented in the market, and will open up greater competitive possibilities in a crisis-affected sector. A systematic study of the factors that affect the rheological properties of AAMs (pastes, mortars and concretes) is therefore necessary in order to ultimately develop more resistant and durable materials.

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“…Given the worldwide interests in geopolymers, the number of scientific publications regarding these materials has increased exponentially in recent years, alongside research organizations, with three milestone technical books published on the subject [68][69][70]. Although the investigations of geopolymers are mainly focused on concrete applications, they are also regarded as attractive materials for evaporative cooling applications.…”

Section: Geopolymersmentioning

confidence: 99%

Green Material Prospects for Passive Evaporative Cooling Systems: Geopolymers

et al. 2016

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Passive cooling techniques have been used mostly in countries with hot and arid climates such as Iran, Egypt, and India. However, the use of this important technology has not been seriously considered until a time of energy crisis, and consequently, environmental crisis scenarios, emerge. Scholars have renewed their interest in investigating passive cooling technology, particularly the aspects of new materials, thermal comfort, energy efficiency, new designs, climate, and environmental considerations. This review paper highlights the opportunities to use green materials, such as geopolymers, as evaporative cooling materials with different types of industrial and agricultural waste products as components. Novel ideas for passive cooling design using ancient and nature-inspired concepts are also presented to promote green technology for future applications.

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Introduction to Handbook of Alkali-activated Cements, Mortars and Concretes

Cited by 297 publications

References 24 publications

POFA-Engineered Alkali-activated Cementitious Composite Performance in Acid Environment

POFA-Engineered Alkali-activated Cementitious Composite Performance in Acid Environment

Rheology of Cementitious Materials: Alkali-Activated Materials or Geopolymers

Green Material Prospects for Passive Evaporative Cooling Systems: Geopolymers

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