Assessment on engineering properties and CO2 emissions of recycled aggregate concrete incorporating waste products as supplements to Portland cement

Alnahhal, Mohammed Fouad; Alengaram, U. Johnson; Jumaat, Mohd Zamin; Abutaha, Fuad; Alqedra, Mamoun; Nayaka, R. Ramesh

doi:10.1016/j.jclepro.2018.08.292

Cited by 174 publications

(58 citation statements)

References 60 publications

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“…Recycled aggregates have an environmental benefit [1,2] and recycling is a necessity as the rate of waste generation is such that landfills are close to saturation [3]. Additionally, the possibility of obtaining recycled concrete (RAC) with good mechanical [4] and durability [5] properties has been proven.…”

Section: Introductionmentioning

confidence: 99%

High-Frequency Fatigue Testing of Recycled Aggregate Concrete

et al. 2019

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Concrete fatigue behaviour has not been extensively studied, in part because of the difficulty and cost. Some concrete elements subjected to this type of load include the railway superstructure of sleepers or slab track, bridges for both road and rail traffic and the foundations of wind turbine towers or offshore structures. In order to address fatigue problems, a methodology was proposed that reduces the lengthy testing time and high cost by increasing the test frequency up to the resonance frequency of the set formed by the specimen and the test machine. After comparing this test method with conventional frequency tests, it was found that tests performed at a high frequency (90 ± 5 Hz) were more conservative than those performed at a moderate frequency (10 Hz); this effect was magnified in those concretes with recycled aggregates coming from crushed concrete (RC-S). In addition, it was found that the resonance frequency of the specimen–test machine set was a parameter capable of identifying whether the specimen was close to failure.

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Section: Introductionmentioning

confidence: 99%

High-Frequency Fatigue Testing of Recycled Aggregate Concrete

et al. 2019

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“…In concrete, high amounts of by-products that generated in the manufacturing process may be used as additional mineral, which can be regarded as additional supplementary cementitious materials (SCMs), having proper quality control. The application of these materials provides significant environmental and economic benefits such as reduction in the emissions of contaminating gases [7,8] and decrease in the quantity of usual resources [4] that are resultant from the processing of Portland cement.…”

Section: Introductionmentioning

confidence: 99%

Effects of nanosilica to improve the mechanical, electrical and durability properties of fiber-reinforced high-volume processed sugarcane bagasse ash cement mortar

Gopalakrishnan

Kaveri

JohnKirubahar

2021

Preprint

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Nanosilica (NS) has attracted wide variety of usage as cement ingredients. While many other studies have focused on early cement hydration and hardening properties, there is less data available on the impact of NS on the behavior of fiber-reinforced high-volume sugarcane bagasse cement mortar (HVSCBAM). The effects of NS on the fiber-reinforced durability of HVSCBAM, having the properties of sugarcane bagasse ash/binder in an average of 50% by weight, have been presented in detail in this study. Four NS/binder weight ratio dosages of 0%, 0.5%, 1.0% and 1.5% of and another four total PVA fiber/volume ratio dosages of 0%, 0.2%, 0.5% and 1.0% were used. Compared to 0.2-1 vol.% of PVA fiber–reinforced HVSCBAM, the 1.5 wt.% of NS would enhance the compressive strength further. Various reports on mineralogy and microstructure have demonstrated that NS facilitates fiber/matrix bonding. These conclusions provide an insight into the pozzolanic materials of cement that are used in a large volume in the designs and applications of nanoparticles.

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“…The current state of concrete production should not continue on inherited conventional PC technology of the twentieth century [7]. The emissions from PC production can be reduced by using an alternative binder for concrete production or partially replacing cement in concrete production [8][9][10]. Given the present global attention on environmental awareness, industries today should strive to attain sustainability through input maximization or the effective management of generated wastes [11].…”

Section: Introductionmentioning

confidence: 99%

“…With concrete as the most used construction material [14], there is an ongoing search for environmentally friendly materials that can effectively substitute the constituents of concrete without compromising its strength and durability. This search has led to the use of various agricultural, industrial and municipal waste materials in concrete production as either a supplementary cementitious material (SCM) or an alternative aggregate [10,15,16]. Though there is uncertainty in the use of some waste materials leading to their non-utilization in concrete production [17], the need for environmental protection has caused continuous research in this area and led to more use of waste materials in concrete production [18].…”

Section: Introductionmentioning

confidence: 99%