Improvement of the Durability of Recycled Masonry Aggregate Concrete

Pavlů, Tereza; Fořtová, Kristina; Řepka, Jakub; Mariaková, Diana; Pazderka, Jiří

doi:10.3390/ma13235486

Cited by 8 publications

(5 citation statements)

References 76 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since clay brick is a kind of low-strength porous material, mixing it into RA and using it as a recycled raw material will further reduce the density and strength and increase the crushing index [ 12 ]. Discarded clay brick also leads to a high water absorption coefficient and affects the water–cement ratio (W/C) of concrete [ 30 , 31 , 32 ]. To avoid the absorption of RA to mixing water, Pacheco-Torgal and Anderson et al soaked RA for 24 h then transformed it into a saturated dry surface state [ 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Mixed Recycled Aggregate on the Mechanical Strength and Microstructure of Concrete under Different Water Cement Ratios

et al. 2021

View full text Add to dashboard Cite

Mixed recycled aggregate (MRA) is a kind of recycled aggregate containing discarded bricks and other impurities that is inferior to ordinary recycled concrete aggregate. To study the effect of MRA in concrete, specimens with 100% MRA under different water–cement ratios (W/C) of 0.50, 0.42, 0.36 and 0.30 were prepared, and the mechanical properties and microstructure were tested. Results show that compared with ordinary concrete, the compressive strength of mixed recycled aggregate concrete (MRAC) with the same W/C was reduced by more than 50% at 28 days, but the axial compression ratio was relatively high, reaching over 0.87. Affected by the high water absorption of MRA, the hydration rate of cement slowed, which was beneficial to the long-term development of the properties of MRAC. An appropriate increase in cement content could strengthen MRA and densify the pore structure of MRAC. The research results of this article prove that MRA has high utilization value and could be used to prepare MRAC with application potential using optimal gradation, which is of positive significance for promoting the consumption of construction waste.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Mixed Recycled Aggregate on the Mechanical Strength and Microstructure of Concrete under Different Water Cement Ratios

et al. 2021

View full text Add to dashboard Cite

show abstract

“…On the contrary, fRCAC mixtures prepared by the Czech team achieved more favorable results in carbonation resistance, where increase in carbonation depth was observed in one mixture (fRCAC1 IA) only. However, from the point of view of previous studies carried out by the same research group [91,92], the negative influence of fRA is significantly lower than the impact of coarse RA.…”

Section: Carbonation Resistancementioning

confidence: 80%

“…Water flow in the system is natural under gravity or capillarization method [90]. A 250-room hotel in Birmingham, UK, with the rainwater recycling system saved up to 780 m 3 of potable water per year [91]. According a comparative simulation model, gravity fed rainwater harvesting system for a high rise building in Mexico saved up to 8.5% of GHG [92].…”

Section: Alternate Water Resources For Water Reusesmentioning

confidence: 99%

“…Efficiency of water use can be improved by graywater recycling systems for flushing of toilets by dual piping, which will contribute to reducing urban water demand from 10% to 25% [94]. NH Campo de Gibraltar hotel substitutes 20% of potable water with filtered and treated grey water from showers, which resulted in a 20% reduction in annual water bill [91]. Blackwater comes from toilets and kitchens.…”

Section: Alternate Water Resources For Water Reusesmentioning

confidence: 99%

See 1 more Smart Citation

Sustainable Construction Materials: From Paste to Concrete

2023

View full text Add to dashboard Cite

show abstract

“…Tam et al [12] used three acid solutions to remove the mortar from the RCA surface, effectively reducing the water absorption of the RCA while leaving the alkalinity of the aggregate unaffected. Pavlu et al [13,14] showed that crystal admixtures could fill the pores in recycled masonry aggregate, thereby improving the mechanical properties and durability of recycled masonry concrete. Spaeth et al [15] used a polymer impregnation treatment to significantly reduce the water absorption of RCA and improve its resistance to cracking.…”

Section: Introductionmentioning

confidence: 99%

Effect of Composite Impregnation on Properties of Recycled Coarse Aggregate and Recycled Aggregate Concrete

Zhong

Tian

et al. 2022

Buildings

View full text Add to dashboard Cite

To improve the properties of recycled aggregate concrete, single and composite impregnation treatments were carried out on recycled coarse aggregates with sodium silicate solution, silane slurry, and polyvinyl alcohol solution. The effects of the three chemical modifiers and different impregnation methods on the apparent density, water absorption, and crushing index of recycled coarse aggregates, as well as the basic properties of recycled aggregate concrete, were investigated. Additionally, the microstructure of the surface of recycled coarse aggregate and the interior of recycled aggregate concrete were analyzed by scanning electron microscopy. The experimental results show that the water absorption of recycled coarse aggregate soaked in polyvinyl alcohol solution decreases most significantly, reaching 64.56%. Only the combination of sodium silicate and silane impregnation produces a positive compounding effect, with a significant increase in the apparent density and a significant reduction in the crushing index of the recycled coarse aggregate. Compared with untreated concrete, the slump, compressive strength, splitting tensile strength, and flexural strength of recycled aggregate concrete prepared by sodium silicate and silane composite impregnation are increased by 9.8%, 26.53%, 21.70%, and 14.72%, respectively. The microstructure analysis shows that the composite impregnation treatment of sodium silicate and silane is most conducive to filling the cracks and holes on the surface of recycled coarse aggregate, which makes the interfacial transition zone of recycled aggregate concrete more compact and the structure more stable.

show abstract

Improvement of the Durability of Recycled Masonry Aggregate Concrete

Cited by 8 publications

References 76 publications

Effect of Mixed Recycled Aggregate on the Mechanical Strength and Microstructure of Concrete under Different Water Cement Ratios

Effect of Mixed Recycled Aggregate on the Mechanical Strength and Microstructure of Concrete under Different Water Cement Ratios

Sustainable Construction Materials: From Paste to Concrete

Effect of Composite Impregnation on Properties of Recycled Coarse Aggregate and Recycled Aggregate Concrete

Contact Info

Product

Resources

About