Lightweight mortar made with recycled polyurethane foam

Gadea, J.; Rodríguez, Ángel; Campos, P.L.; López, Javier Garabito; Carpintero, Verónica Calderón

doi:10.1016/j.cemconcomp.2010.07.017

Cited by 90 publications

(52 citation statements)

References 15 publications

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“…for the same cement it has less water and lower voids volume, creating greater cohesion and higher strength in the mortar. Usually the addition of air (porosity) leads to a reduction of around 3% to 5% in mechanical strength per 1% of air incorporated 26 . These results agree with those of other authors such as Hamassaki et al 10 , who obtained the best compressive strength results for the mix with 100% incorporation of concrete waste.…”

Section: Flexural and Compressive Strength Of Hardened Mortarmentioning

confidence: 99%

“…The test was performed on five specimens per mix type after curing for 28 days. Water vapor permeability is a factor in pathology associated with excess condensation or dampness, usually linked with lack of permeability 26 . The results in Table 6 show that the water vapor permeability of the mortar containing concrete waste (A20) is slightly higher than that of the reference mix (A0).…”

Section: Water Vapor Permeability Of Hardened Mortarmentioning

confidence: 99%

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Using fine recycled concrete aggregate for mortar production

2013

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This research assessed the performance of mortars in which recycled concrete aggregates (RCA) was a component. It replaced natural sand but kept the same particle size distribution. Three mortars were produced with replacement ratios of 20%, 50% and 100% as well as a reference mortar containing no recycled aggregate. The compressive and flexural strength, water absorption by capillarity, drying capacity and susceptibility to cracking of these mortars were analyzed first. Then, based on these results, the most satisfactory replacement ratio was chosen and the following properties were analyzed: water retentivity, shrinkage, adhesive strength, modulus of elasticity, and water vapor permeability. Somewhat surprisingly the best results in the first stage occurred for 20% and 100% replacement ratios, leading to a cautious choice of the 20% ratio for the second stage. Generally the mortar with 20% replacement ratio performed better than the reference mortar, except for adhesive strength and dimensional stability.

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Section: Flexural and Compressive Strength Of Hardened Mortarmentioning

confidence: 99%

Section: Water Vapor Permeability Of Hardened Mortarmentioning

confidence: 99%

Using fine recycled concrete aggregate for mortar production

2013

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“…This clearly shows the high energy absorption capacity of these concretes that was suggested earlier [4,5,11,31,37]. A recent study [38] reported that there are two main advantages of concrete containing waste plastic: first, the compactness of between 15% and 35%, reducing the thickness under compressive loading and, second, dimensional regaining after load removal. Figure 9 shows the UPV values of concrete containing different contents of SPS and FA at different curing times.…”

Section: Failure Modementioning

confidence: 57%

Combined Effects of Densified Polystyrene and Unprocessed Fly Ash on Concrete Engineering Properties

Herki

2017

Buildings

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Abstract:The present study evaluated the combined effects of two types of waste materials of expanded polystyrene (EPS) and unprocessed fly ash (FA) on different properties of concrete. A novel recycling technique of densifying waste EPS is used to produce a novel lightweight aggregate (LWA). This new technique has solved the problem of segregation in concrete by coating EPS particles with a natural binder of clay and cement. Nine different concrete mixtures with a water to cement ratio of 0.8 were used. The densified EPS and unprocessed FA were partially replaced with natural aggregate and Portland cement, respectively. The engineering properties, including workability, density, compressive strength, ultrasonic pulse velocity (UPV), and water absorption (WA) were investigated at different curing times. According to the experimental results, there is a decrease in compressive strength and UPV with increasing this novel LWA content in concrete. However, by using a suitable mix design, the utilisation of these two waste materials in concrete using an appropriate recycling technique is possible.

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“…For example, an experimental study by Gadea et al (2010) on using rigid polyurethane foam instead of sand to make lightweight mortar shows a decrease in the density and mechanical properties and an increase in the workability. Sari et al (2004) have done experimental studies on lightweight concrete made of scoria, and have also experimented with the effect of plasticizer and air entrained agents to improve the workability of concrete.…”

Section: Introductionmentioning

confidence: 99%