Bond of spliced GFRP reinforcement bars in alkali activated cement concrete

2017 ◽  
Vol 147 ◽  
pp. 740-751 ◽  
Author(s):  
Biruk Hailu Tekle ◽  
Amar Khennane ◽  
Obada Kayali
Keyword(s):  
Cement Concrete ◽  
Gfrp Reinforcement ◽  
Alkali Activated ◽  
Alkali Activated Cement

Bond behaviour of GFRP reinforcement in alkali activated cement concrete

2017 ◽  
Vol 154 ◽  
pp. 972-982 ◽  
Author(s):  
Biruk Hailu Tekle ◽  
Amar Khennane ◽  
Obada Kayali
Keyword(s):  
Cement Concrete ◽  
Bond Behaviour ◽  
Gfrp Reinforcement ◽  
Alkali Activated ◽  
Alkali Activated Cement

Parametric study on bond of GFRP bars in alkali-activated cement concrete

2020 ◽  
Vol 72 (13) ◽  
pp. 670-680
Author(s):  
Biruk Hailu Tekle ◽  
Amar Khennane
Keyword(s):  
Parametric Study ◽  
Cement Concrete ◽  
Gfrp Bars ◽  
Alkali Activated ◽  
Alkali Activated Cement

scholarly journals Lifecycle assessment of alkali activated cement concrete

2021 ◽  
Vol 2070 (1) ◽  
pp. 012241
Author(s):  
Angitha K Viswanath ◽  
K B Anand
Keyword(s):  
Carbon Dioxide ◽  
Compressive Strength ◽  
Fly Ash ◽  
Portland Cement ◽  
Sodium Hydroxide ◽  
Cement Concrete ◽  
Lifecycle Assessment ◽  
The Impact ◽  
Alkali Activated ◽  
Alkali Activated Cement

Abstract Climate change is one of the most important environmental problems that our planet Earth is facing. This is due to the increased emission of greenhouse gases such as carbon dioxide. Concrete, the most consumed material in the construction industry is reported to be responsible for about 8% of worldwide carbon dioxide emissions. The manufacturing of ordinary Portland cement is both resource and energy-intensive and is accountable for 1.35 billion tons of carbon dioxide emitted annually. Hence potential alternative to Portland cement widely recognized is the adoption of alkali-activated cement. Alkali-activated cement commonly utilizes industrial by-products such as fly ash, GGBS, etc. along with alkali activators such as sodium silicate and sodium hydroxide. The literature review indicates that the environmental impact due to the usage of Portland cement can be reduced by the adoption of alkali-activated cement. However, the manufacture of alkali activators is likely to contribute to the emission to the environment. In addition, the heat curing commonly adopted during the production of concrete to activate the alkalis might also have a bearing. Hence a comparative study using the lifecycle assessment (LCA) method is carried out to assess the impact due to the production of alkali-activated cement concrete using supplementary cementitious materials (SCM) fly ash and GGBS with varying proportions of alkali activators (sodium silicate and sodium hydroxide). Data is extracted from the published literature corresponding to two different compressive strength ranges of OPC concrete and alkali-activated cement concretes that have utilized four varying proportions of alkali activator ratios. It is then analyzed by the ‘cradle to gate’ approach using LCA software SimaPro. The impact assessment is done using the ReCiPe 2016 method. A comparison of results and their interpretation is done based on its compressive strength ranges, the alkali activator ratios, and the effect due to change in the SCMs utilized.

scholarly journals Alkali-activated slag concrete with paper industry waste

2021 ◽  
Vol 39 (3) ◽  
pp. 466-472
Author(s):  
Maria Mavroulidou ◽  
Shamil Shah
Keyword(s):  
Paper Industry ◽  
Steel Production ◽  
Waste Materials ◽  
Paper Sludge ◽  
Activation Process ◽  
Cement Concrete ◽  
Paper Sludge Ash ◽  
Sludge Ash ◽  
Alkali Activated ◽  
Alkali Activated Cement

Pulp and paper manufacturing and recycling industries are a resource-intensive sector, generating 25–40% of the annual municipal solid waste worldwide. Waste includes abundant volumes of paper sludge, as well as the product of its incineration, namely paper sludge ash. These two waste materials are both predominantly landfilled. There is thus a drive for additional valorisation routes for these materials. This short communication focuses on the potential use of paper sludge ash in alkali-activated cement concrete; this type of concrete was estimated to potentially reduce CO2 emissions by up to 5–6 times, while it can also incorporate waste materials or industrial by-products in its composition. The paper presents a laboratory study assessing the feasibility of structural alkali-activated cement concrete with ground granulated blastfurnace slag (a by-product of steel production) and paper sludge ash. Paper sludge ash is used mainly as a source of Ca(OH)2 in the alkaline activator solution, and secondly as an additional source of aluminosilicates. A number of factors potentially affecting the activation process and the resulting concrete quality were investigated, including different dosage of activators, curing conditions and curing time. Mixes with paper sludge ash in the activator system developed high early concrete strengths at ambient temperatures and maintained adequate strengths for structural concrete. Further mix optimisation and mechanical and durability testing, accompanied by material characterisation, are required to establish the advantages of using this waste material in structural alkali-activated cement concrete.

Improved Reactivity of Volcanic Ash using Municipal Solid Incinerator Fly Ash for Alkali-Activated Cement Synthesis

2019 ◽  
Vol 11 (6) ◽  
pp. 3035-3044
Author(s):  
Sylvain Tome ◽  
Marie-Annie Etoh ◽  
Jacques Etame ◽  
Sanjay Kumar
Keyword(s):  
Fly Ash ◽  
Volcanic Ash ◽  
Alkali Activated ◽  
Alkali Activated Cement

Efflorescence of microwave-heated alkali-activated cement synthesized with ultrafine coal combustion ashes

Fuel ◽  
2021 ◽  
Vol 303 ◽  
pp. 121225
Author(s):  
Huimei Zhu ◽  
Pei Qiao ◽  
Yuwen Zhang ◽  
Jiani Chen ◽  
Hui Li
Keyword(s):  
Coal Combustion ◽  
Ultrafine Coal ◽  
Alkali Activated ◽  
Alkali Activated Cement
Sign in / Sign up

Export Citation Format

Share Document