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Properties Of Concrete

Eco-efficient cements: Potential economically viable solutions for a low-CO2 cement-based materials industry

Recycled aggregate from C&D waste & its use in concrete – A breakthrough towards sustainability in construction sector: A review

A review of recycled aggregate in concrete applications (2000–2017)

Review of LCA studies of solid waste management systems--part I: lessons learned and perspectives.

Punching failure mechanism at edge columns of post-tensioned lift slabs

For the purpose of the environmental preservation and sustainable development, production of concrete made of recycled concrete rubble (recycled aggregate concrete-RAC) become more often. Results of experi­mental investigations of mechanical properties of RAC, performed in last 20 years, are presented in this paper. Test results of RAC compressive strength, tensile strength and elastic modulus are critically analyzed and compared. Comparison of natural aggregate concrete (NAC) and RAC properties is performed too, and differences and similarities are pointed out. Based on analyzed experimental results, it can be concluded that RAC has the future in structural applications. However, significant scatter of the test results points at a need for more experimental investigation of RAC properties, and especially, of structural elements made of RAC.

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Mechanical properties of recycled aggregate concrete

The use of alkali activated fly ash concrete (AAFAC) is an important step towards addressing two problems in the construction industry – environmental impact of cement production and large fly ash landfills. In this study, AAFAC was prepared with class F fly ash from power plant 'Nikola Tesla B' in Serbia and a mixed alkali activator consisting of sodium silicate and sodium hydroxide solutions. The experimental programme consisted of three phases. First, eight alkali activated fly ash pastes (AAFAP) with different activator combinations and a mass ratio of activator to fly ash of 0.6 were tested in order to investigate their effect on the compressive strength and workability. In the second phase, four mixtures of AAFAC were made with one optimal activator solution and additional water was added to study its effect on workability and compressive strength. Finally, eight mixtures of AAFAC were made to investigate the development of compressive strength through time. All samples were oven-cured at 80°C for 6 hours. The results of compressive strength and workability of tested concretes showed that fly ash from power plant 'Nikola Tesla B' can be used as a binder in AAFAC made with sodium silicate and sodium hydroxide as alkali activators.

/pdf/experimental-study-of-alkali-activated-fly-ash-concrete-with-tqljvrcr5p.pdf

Experimental study of alkali activated fly ash concrete with fly ash from one serbian power plant

The environmental impacts of activities such as raw material extraction, construction of infrastructure, and demolition, place construction as one of the sectors that exert the highest pressures on the environment, society, and economy. Some of the major environmental impacts for which the construction industry is responsible are mineral resource depletion, greenhouse gas emissions, and waste generation. Among the different strategies that exist to decrease such impacts, recycling demolition waste into recycled concrete aggregates has been considered a promising alternative. As such, at present, the literature dealing with the impact assessment of recycled aggregate concrete structures is very extensive. Therefore, the objective of this article is to present a critical view of the state‐of‐the‐art in terms of sustainability assessment of recycled aggregate concrete structures, taking a holistic perspective by considering environmental, social, and economic impacts.

https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/suco.202201245

Sustainability assessment of recycled aggregate concrete structures: A critical view on the current state‐of‐knowledge and practice

Recycled aggregate concrete (RAC), i.e., concrete produced with recycled concrete aggregate (RCA) has been heavily investigated recently, and the structural design of RAC is entering into design codes. Nonetheless, the service load deflection behavior of RAC remains a challenge due to its larger shrinkage and creep, and lower modulus of elasticity. A novel solution to this challenge is the use of layered concrete, i.e., casting of horizontal layers of different concretes. To investigate the potential benefits and limits of layered concrete, this study contains a numerical parametric assessment of the time-dependent sustained service load deflections and environmental impacts of homogeneous and layered NAC and RAC one-way slabs. Four types of reinforced concrete slabs were considered: homogeneous slabs with 0%, 50% and 100% of coarse RCA (NAC, RAC50 and RAC100, respectively) and layered L-RAC100 slabs with the bottom and top halves consisting of RAC100 and NAC, respectively. In the deflection study, different statical systems, concrete strength classes and relative humidity conditions were investigated. The results showed that the layered L-RAC100 slabs performed as well as, or even better than, the NAC slabs due to the differential shrinkage between the layers. In terms of environmental performance, evaluated using a “cradle-to-gate” Life Cycle Assessment approach, the L-RAC100 slabs also performed as well as, or slightly better than, the NAC slabs. Therefore, layered NAC and RAC slabs can be a potentially advantageous solution from both structural and environmental perspectives.

Snežana Marinković

Papers

Punching failure mechanism at edge columns of post-tensioned lift slabs

Mechanical properties of recycled aggregate concrete

Experimental study of alkali activated fly ash concrete with fly ash from one serbian power plant

Sustainability assessment of recycled aggregate concrete structures: A critical view on the current state‐of‐knowledge and practice

Improved Serviceability and Environmental Performance of One-Way Slabs through the Use of Layered Natural and Recycled Aggregate Concrete