Analysis of the compactness and properties of the hardened state of mortars with recycling of construction and demolition waste (CDW)

Azevedo, Afonso Rangel Garcez de; Cecchin, Daiane; Carmo, D.F.; Silva, F.C.; Campos, C.M.O.; Shtrucka, T.G.; Marvila, Markssuel Teixeira; Monteiro, Sérgio Neves

doi:10.1016/j.jmrt.2020.03.122

Cited by 85 publications

(34 citation statements)

References 49 publications

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“…They related the moisture content to be used with the specific weight of the soil samples and the mixtures with PET. To perform the compaction test, a cylindrical mold (Normal Proctor) was used, with a base attached to a metal socket which has a drop control apparatus [ 40 , 41 ].…”

Section: Methodsmentioning

confidence: 99%

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Technological Characterization of PET—Polyethylene Terephthalate—Added Soil-Cement Bricks

Silva

Cecchin

Azevedo³

et al. 2021

Materials

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The ever-growing consumption and improper disposal of non-biodegradable plastic wastes is bringing worrisome perspectives on the lack of suitable environmentally correct solutions. Consequently, an increasing interest in the circular economy and sustainable techniques is being raised regarding the management of these wastes. The present work proposes an eco-friendly solution for the huge amount of discarded polyethylene terephthalate (PET) wastes by addition into soil-cement bricks. Room temperature molded 300 × 150 × 70 mm bricks were fabricated with mixtures of clay soil and ordinary Portland cement added with up to 30 wt.% of PET waste particles. Granulometric analysis of soil indicated it as sandy and adequate for brick fabrication. As for the PET particles, they can be considered non-plastic and sandy. The Atterberg consistency limits indicated that addition of 20 wt.% PET waste gives the highest plasticity limit of 17.3%; moreover, with PET waste addition there was an increase in the optimum moisture content for the compaction and decrease in specific weight. Standard tests showed an increase in compressive strength from 0.83 MPa for the plain soil-cement to 1.80 MPa for the 20 wt.% PET-added bricks. As for water absorption, all bricks displayed values between 15% and 16% that attended the standards and might be considered an alternative for non-structural applications, such as wall closures in building construction.

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Section: Methodsmentioning

confidence: 99%

“…For the statistical analysis, 7 samples of each treatment were used. The dimensions of the samples were measured with a calliper, according to the ABNT standards [ 40 , 41 ]. Then the bricks were cut in half ( Figure 2 a) in the transverse direction, having the upper part of the socket removed, as recommended by the ABNT standard [ 41 ].…”

Section: Methodsmentioning

confidence: 99%

Technological Characterization of PET—Polyethylene Terephthalate—Added Soil-Cement Bricks

Silva

Cecchin

Azevedo³

et al. 2021

Materials

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“…Construction and demolition waste (CDW) has also been considered as a replacement for natural sand. The results of this study indicate a 25% composition of CDW as being the most suitable for use in building construction [1]. Understanding the adhesion properties between a mortar and a support is a major challenge for manufacturers who try through more and more complex formulations to improve the performance of their products.…”

Section: Introductionmentioning

confidence: 92%

Estimation of the Adherence of Mortars Using Ultrasound

Khaldi

Belachia

Benouis

2020

Civil and Environmental Engineering Reports

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Mortars are subjected to severe external stresses such as freezing, thawing, and drying during their lifetime. These stresses can lead to a loss of adhesion between the support and the mortar. The strength of the substrates with respect to their ability to receive a coating (mortar) is characterized in particular by the value of minimum tear resistance of the surface to be coated. In this work, the use of a non-destructive method which is both fast and easy to implement is employed to evaluate this support-mortar adhesion. The first method is based on the measurement of the velocities of the surface ultrasonic waves and the second by tearing tests using a specific dynamometer. The determination of the adhesion strength concerned two different supports (concrete beam and masonry block) coated with two types of mortar (a prepared cement mortar and a ready-to-use mortar) with two different thicknesses for each mortar (1 and 2 cm, respectively). The results of the two methods are then correlated for an estimation of the adhesion of the mortars.

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“…Concrete and mortar are the most commonly used construction materials in civil engineering [1][2][3]. Many environmental influencing factors affect the performance variation of concrete structures, and the sulfate attack is one of the most important factors in the deterioration of concrete structures [4].…”

Section: Introductionmentioning

confidence: 99%

Effects of Erosion Form and Admixture on Cement Mortar Performances Exposed to Sulfate Environment

Liu

Chen

2020

Crystals

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The effects of the admixtures, erosion age, concentration of sulfate solution, and erosion form of sulfate attack on the mechanical properties of mortar were investigated. Simultaneously, the microstructure, pore characteristics, kinds and morphologies of erosion products of mortar before and after sulfate attacks were performed by Mercury Intrusion Porosimetry (MIP), Environment Scanning Electronic Microscope and Energy Dispersive Spectrometer (ESEM-EDS). In addition, the crystal form and morphology characteristics of crystallization on mortar surfaces attacked by partial immersion form were studied. The results showed that the compressive and flexural strengths of mortar attacked by sulfate for four months decreased with the increase of the replacement of cement with fly ash, and the corresponding strength of mortar containing slag first increased and then decreased. The admixtures can improve the microstructure and mechanical properties of mortar within the replacement ratio of 10%. Although the change laws of the mortar specimens containing different admixtures were similar, the mortar containing slag had an excellent sulfate resistance under the same condition. Compared with the complete immersion form, the strength variation of the mortar containing fly ash attacked by semi-immersion form was less. The porosity and average pore diameter of mortar attacked by sulfate for four months increased, and the percentage of micropore with the pore diameter less than 200 nm increased. Plenty of rod-like and plate-like erosion products were generated in mortar attacked by a sulfate solution with a high concentration. A larger number of fibrous and flocculent crystallization covered the mortar’s surface containing fly ash, but it was a granular and dense crystallization formed on the mortar’s surface containing slag. Much dendritic erosion product was generated in the mortar attacked by semi-immersion form, and ESEM-EDS analysis revealed that it may be scawtite, spurrite, and residue of the decomposed calcium silicate hydrate (CSH) in the inner mortar; however, the crystallization sodium sulfate was crystallized on mortar surface.

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Analysis of the compactness and properties of the hardened state of mortars with recycling of construction and demolition waste (CDW)

Cited by 85 publications

References 49 publications

Technological Characterization of PET—Polyethylene Terephthalate—Added Soil-Cement Bricks

Technological Characterization of PET—Polyethylene Terephthalate—Added Soil-Cement Bricks

Estimation of the Adherence of Mortars Using Ultrasound

Effects of Erosion Form and Admixture on Cement Mortar Performances Exposed to Sulfate Environment

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