Structural recycled concrete: Behaviour under low loading rate

González-Fonteboa, Belén; Martínez-Abella, Fernando; Herrador, Manuel F.; Seara-Paz, Sindy

doi:10.1016/j.conbuildmat.2011.08.010

Cited by 53 publications

(13 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The fourth reason was that the substitution of the stronger substance via the weaker one and the lack of the pozzolanic action by the sawdust waste also affected negatively the strength development. This finding was consistent with the previous reports of Kanojia and Jain, S. [52], Martínez-García et al [53], and González-Fonteboa et al [54].…”

Section: Workability and Settingsupporting

confidence: 94%

Engineering Properties of Waste Sawdust-Based Lightweight Alkali-Activated Concrete: Experimental Assessment and Numerical Prediction

et al. 2020

View full text Add to dashboard Cite

Alkali activated concretes have emerged as a prospective alternative to conventional concrete wherein diverse waste materials have been converted as valuable spin-offs. This paper presents a wide experimental study on the sustainability of employing waste sawdust as a fine/coarse aggregate replacement incorporating fly ash (FA) and granulated blast furnace slag (GBFS) to make high-performance cement-free lightweight concretes. Waste sawdust was replaced with aggregate at 0, 25, 50, 75, and 100 vol% incorporating alkali binder, including 70% FA and 30% GBFS. The blend was activated using a low sodium hydroxide concentration (2 M). The acoustic, thermal, and predicted engineering properties of concretes were evaluated, and the life cycle of various mixtures were calculated to investigate the sustainability of concrete. Besides this, by using the available experimental test database, an optimized Artificial Neural Network (ANN) was developed to estimate the mechanical properties of the designed alkali-activated mortar mixes depending on each sawdust volume percentage. Based on the findings, it was found that the sound absorption and reduction in thermal conductivity were enhanced with increasing sawdust contents. The compressive strengths of the specimens were found to be influenced by the sawdust content and the strength dropped from 65 to 48 MPa with the corresponding increase in the sawdust levels from 0% up to 100%. The results also showed that the emissions of carbon dioxide, energy utilization, and outlay tended to drop with an increase in the amount of sawdust and show more the lightweight concrete to be more sustainable for construction applications.

show abstract

Section: Workability and Settingsupporting

confidence: 94%

Engineering Properties of Waste Sawdust-Based Lightweight Alkali-Activated Concrete: Experimental Assessment and Numerical Prediction

et al. 2020

View full text Add to dashboard Cite

show abstract

“…However, not all the 24 h water absorption was compensated, rather the absorption at 10 min. This criterion was also used by many other authors [8,9,36,37], whose mixing time is also 10 min, the time during which the absorption of mixing water by the recycled aggregates is supposed to occur.…”

Section: Mixes Designmentioning

confidence: 96%

Study of the rheology of self-compacting concrete with fine recycled concrete aggregates

Carro-López

González-Fonteboa

Brito

et al. 2015

Construction and Building Materials

Self Cite

163

View full text Add to dashboard Cite

“…Recycled aggregate concrete (RAC), a new type of environmentally friendly material using waste concrete as recycled aggregates to substitute for natural aggregates, is made partly or totally by processes of washing, crushing, grading, and proportional mixing. Although RAC is no longer considered a new technology and many studies have focused on its use, currently most of the experimental studies on RAC fire resistance performance have been confined to RAC material rather than structural components [ 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. Xiao et al [ 15 ] analyzed the factors affecting thermal conductivity of RAC and provided the calculation method and formula for RAC thermal performance parameters with different amounts of recycled coarse aggregate (RCA) replacement.…”

Section: Introductionmentioning

confidence: 99%

The Fire Resistance Performance of Recycled Aggregate Concrete Columns with Different Concrete Compressive Strengths

et al. 2014

View full text Add to dashboard Cite

In order to ascertain the fire resistance performance of recycled aggregate concrete (RAC) components with different concrete compressive strengths, four full-scaled concrete columns were designed and tested under high temperature. Two of the four specimens were constructed by normal concrete with compressive strength ratings of C20 and C30, respectively, while the others were made from recycled coarse aggregate (RCA) concrete of C30 and C40, respectively. Identical constant axial forces were applied to specimens while being subjected to simulated building fire conditions in a laboratory furnace. Several parameters from the experimental results were comparatively analyzed, including the temperature change, vertical displacement, lateral deflection, fire endurance, and failure characteristics of specimens. The temperature field of specimens was simulated with ABAQUS Software (ABAQUS Inc., Provindence, RI, USA) and the results agreed quite well with those from the experiments. Results show that the rate of heat transfer from the surface to the interior of the column increases with the increase of the concrete’s compressive strength for both RAC columns and normal concrete columns. Under the same initial axial force ratio, for columns with the same cross section, those with lower concrete compressive strengths demonstrate better fire resistance performance. The fire resistance performance of RAC columns is better than that of normal concrete columns, with the same concrete compressive strength.

show abstract

Structural recycled concrete: Behaviour under low loading rate

Cited by 53 publications

References 26 publications

Engineering Properties of Waste Sawdust-Based Lightweight Alkali-Activated Concrete: Experimental Assessment and Numerical Prediction

Engineering Properties of Waste Sawdust-Based Lightweight Alkali-Activated Concrete: Experimental Assessment and Numerical Prediction

Study of the rheology of self-compacting concrete with fine recycled concrete aggregates

The Fire Resistance Performance of Recycled Aggregate Concrete Columns with Different Concrete Compressive Strengths

Contact Info

Product

Resources

About