The same type of recycled masonry aggregate was used as a full replacement of natural aggregate for concrete mixtures. Each mixture had a different amount of cement with various effective water-cement ratios. The mechanical and physical properties of RMA concretes were examined to find the optimal concrete mixture.

This study is on mixture experiment design of the workability of high performance recycled coarse aggregate concrete, (i.e. high performance concrete produced with recycled coarse aggregate). slump test, which is a widely used test for determining workability of concrete, was the response property used to study the workability of the high …

Abstract Introduction Section snippets References (84) Cited by (16) Journal of Building Engineering Volume 63, Part B, 1 January 2023, 105570 Mixture …

open access Abstract This paper reviews the use of Recycled Aggregate (RA) that is collected from construction demolition waste in the production of concrete. The …

This strength was nearly 23.36% less than that of conventional concrete. Contrarily, Mix S5 with a binder content of 440 kg/m 3, a water-cement ratio of 0.34, a fiber dosage of 0.6%, and a SA replacement of 40% had the highest 90-day compressive strength. This strength (52.57 MPa) was near about control mix concrete.

The modeling and optimization of concrete compressive strength produced by replacing natural aggregate (NA) with recycled coarse aggregate (RCA) and recycled asphalt pavement (RAP) aggregates was investigated. The materials used were cement, water, fine aggregate, and coarse aggregate (NA, RCA, and RAP). The RCA and RAP replaced …

Although several studies have been investigating the problems related to concrete mix design, ... Mixture optimization of recycled aggregate concrete using hybrid machine learning model. Materials, 13 (19) (2020), pp. 1-24, 10.3390/ma13194331. View in Scopus Google Scholar [30]

The replacement of natural coarse aggregate (NCA) with recycled coarse aggregate (RCA) in concrete mixtures offers various advantages, including conservation of natural resources, reduction of CO 2 emissions, and cost reduction. However, multiple related variables and objectives (e.g., mechanical, economic, and environmental …

Kou et al. ( Kou and Poon, 2013) investigated the long-term properties (up to ten years) of the outdoor exposed RAC consisting recycled concrete aggregate and fly ash as partial replacement of aggregate and cement, respectively. Four replacement ratios of FA to cement in weight, i.e. 0%, 25%, 35% and 55% were considered.

2.3. The Preparation and Test Methods of Concrete. The mixing of recycled aggregates concrete was carried out according to the test methods of cement and concrete for highway engineering (JTG E30-2005). The slump of concrete should be measured and predicted to ensure the mixing quality of recycled aggregate concrete.

After demolition of old roads and buildings, the removed concrete is often considered worthless and disposed of as demolition waste. By collecting the used concrete and breaking it up, recycled concrete aggregate (RCA) is created (Fig. 1).This paper focuses on coarse RCA which is the coarse aggregate from the original concrete that is …

Scope of the review. This review fully expounds on each of the three steps of computational design optimization of concrete mixtures, namely (1) formulating, (2) modeling, and (3) solving the concrete mixture design optimization problem. Each step, explicated in a discrete section of this review, is discussed in the context of examples …

Recycled aggregate concrete (RAC) contributes to mitigating the depletion of natural aggregates, alleviating the carbon footprint of concrete construction, and averting the landfilling of colossal amounts of construction and demolition waste. However, complexities in the mixture optimization of RAC due to the variability of recycled …

Variation in mechanical properties of natural and recycled aggregate concrete as related to the strength of their binding mortar. Materials and Structures, 38 (7) ... Optimization on proportion for recycled aggregate in concrete using two-stage mixing approach. Construction and Building Materials, 21 (10) (2007) ...

On the other hand, natural aggregates (NA) required for producing new concrete are rapidly being depleted due to continuous and excessive mining. Consequently, there has been a growing emphasis on promoting recycled aggregate concrete (RAC), which is manufactured using recycled aggregates (RA) obtained from crushed …

Construction recycled material is crucial for protecting natural resources and promoting sustainable human development in a rapidly industrializing world. Many administrations worldwide accepted that it is beneficial to use demolition waste in the concrete building industry to reduce manufacturing costs and minimize the use of …

Recycled aggregate concrete (RAC) contributes to mitigating the depletion of natural aggregates, alleviating the carbon footprint of concrete construction, and averting the landfilling of colossal amounts of construction and demolition waste. However, complexities in the mixture optimization of RAC due to the variability of recycled aggregates ...

The results indicate a significant improvement in environmental sustainability indicators, including a 19.6% and 21.6% reduction in global warming and acidification …

1. Introduction. Portland cement concrete is the most widely used construction material and the most consumed industrial product in the world. However, the more frequent local shortages of natural aggregates (NA) and the enormous environmental footprint caused by its extraction are global concerns regarding the production of …

The manufacturing of concrete is quantified in a unit volume (1 m) by inputting the amount of the raw materials defined in mix design, transportation, energy and water for facility operations, machine loss and maintenance, and waste treatment. The output comprises emissions, waste, co-products, and other releases.

Replacing natural aggregate (NA) with recycled aggregate (RA) has contributed to the trend of sustainable development in civil construction. With this background, improvements in the mechanical properties of recycled aggregate concrete (RAC) and the scientific design of the mixture ratio are attracting more concern in recent …

Recycled aggregate concrete (RAC) contributes to mitigating the depletion of natural aggregates, alleviating the carbon footprint of concrete construction, and averting the landfi

Abstract. Recycled aggregate concrete (RAC) has received rapidly growing attention given its contribution to sustainability in the construction industry. Except for …

Abstract. Recycled aggregate concrete (RAC) contributes to mitigating the depletion of natural aggregates, alleviating the carbon footprint of concrete …

Replacing natural aggregates with recycled aggregates obtained from the concrete waste of non-conforming elements is suited to manufacturing recycled concrete using replacement rates of 50% and . The cost analysis for a real industrial building applying the different dosing options studied shows that a cost reduction of up to 17.8% …

Abstract. This paper proposes a conceptual formulation for predicting and controlling the compressive strength of Recycled Aggregate Concrete (RAC) mixtures, by explicitly taking into account the specific features of Recycled Concrete Aggregates (RCAs). In fact, since RCAs are significantly more porous than Natural Aggregates …

1. Introduction. Concrete is the most used building materials in the world but, nowadays, the construction sector has been pushed to improve its sustainability and various eco-friendly solutions are being investigated for greening the concrete industry [1], [2].In the recent years, several studies highlighted that the replacement of natural aggregates with …

Abstract Recycled aggregate concrete (RAC) contributes to mitigating the depletion of natural aggregates, alleviating the carbon footprint of concrete construction, and …

Abstract Traditional methods for designing concrete mixtures provide good results; however, they do not guarantee the optimum composition.

The use of recycled aggregate geopolymer concrete as structural concrete is not encouraged due to lack of appropriate mix design methodology. The current study aims to develop a new mix design methodology by using fly ash and ground granulated blast furnace slag with recycle aggregate, which is simpler and more consistent …