Using recycled aggregates from construction and demolition waste can preserve natural aggregate resources, reduce demand of landfill, and contribute to sustainable built environment. This study provides a comprehensive review on recycled aggregate (RA) and recycled aggregate concrete (RAC) regarding their history, …
This shear force was detected in the recycled concrete beams. All the beams, even those with shear reinforcement lower than the minimum required by EHE and recycled concrete displayed significant reserves of strength after cracking. • All the codes studied were conservative and subsequently can be used for the shear design of …
Owing to the variations in the recycled coarse aggregates (RCA) characteristics, the compressive strength prediction of recycled aggregate concrete (RAC) is a complex challenge causing hindrance in the design guidelines development and practical application of RAC.
Two concrete mixes of 1 m3 made of NA and the other containing only RCA were used. The functional unit is defined as 1 m3 of concrete with specified compressive strength. The commercially available LCI from the GaBi U.S. database and ECOinvent were used for transportation, sand, cement production, and landfilling processes.
The effects of two kinds of recycled coarse aggregate replacement rates (80% and ) and three fly ash additions (0%, 15% and 30%) on the compressive strength and frost resistance to recycled…
Concrete is the most popularly used construction material (Jonkers et al. 2010).The materials inherent properties with regard to compressive strength, relative durability, workability, fire resistance, and the feasibility to adapt these properties makes concrete a primary technological solution within the designers' tool-box (Meyer 2009).. …
Although the quality of the RA obtained from waste concrete depends on the strength of the parent concrete, recycling process, and particles size ... Tyrer M. Extended application of the equivalent mortar volume mix design method for recycled aggregate concrete. World Congr Civil, Struct Environ Eng 2020;mix:132-1-132–7. …
The combined effect may yield RCA characteristics equivalent to parent aggregate when interacting with a cement matrix based on SCMs. Substituting the cement with SF (11%), GGBS (14%), and MF (15%) contributes to the compressive strength of recycled aggregate concrete (RAC) up to 11.61% via strengthening the OITZ.
This work is devoted to the study of fresh and hardened properties of concrete containing recycled gravel. Four formulations were studied, the concrete of reference and three concretes containing recycled gravel with 30, 65 and 100 % replacement ratios. All materials were formulated on the basis of S4 class of flowability …
Results indicate a nuanced relationship between RCA replacement levels …
For the design characteristic strength of 45 MPa, three different concrete mixtures with OPC and 10%, 20% OPC replacement with coal ash have been investigated. ... 4.1 Compressive Strength of the Recycled Concrete Hollow Block. Table 1 enlists the basic property test results of hollow block materials. Ten concrete hollow …
Owing to the variations in the recycled coarse aggregates (RCA) characteristics, the compressive strength prediction of recycled aggregate concrete (RAC) is a complex challenge causing hindrance ...
Resource utilization of construction and demolition (C&D) waste has great potential to significantly reduce the consumption of natural resources and improve the environment. Meanwhile, establishing a sound policy system and reducing production are the key ways to solve the problem of C&D waste. Numerous studies on C&D waste, …
Concrete is one of the most used material in construction. Considering its capacity to harden upon water contact, solidification, and acquisition of full strength, concrete becomes capable of ...
The desired concrete strength as per the concrete mix design is 35 MPa with fixed water to cement ratio of 0.48. The concrete mechanical properties increased clearly after replacing the natural coarse aggregates by recycled concrete aggregates.
Use of recycled concrete aggregate in high strength concrete Rahul saini Ujjwal shekhar ( B.tech,Arya college of engineering and Reserch Center,Jaipur,Rajasthan) ... silica fume (SF) in the concrete mix design to improve the quality of recycled aggregates in concrete are presented.Cement was replaced with SF at 0%, 5% and 10%. At all the test ...
Title: Design of Concrete Mixtures with Recycled Concrete Aggregates Author(s): Adam M. Knaack and Yahya C. Kurama Publication: Materials Journal Volume: 110 Issue: 5 Appears on pages(s): 483-494 Keywords: compressive strength; mixture design; modulus of elasticity; mortar; recycled concrete aggregate; slump; workability …
Q. We are in the early planning stage of a major commercial project. During site preparation, the general contractor will require us to demolish and crush a large quantity of existing concrete used in the structure and pavement. In fact, looking through our records, it appears we supplied the concrete on the original project. The owner's …
This paper investigates the design of normal strength concrete mixtures that use recycled concrete aggregates as replacement for natural aggregates. Three mix design methods utilizing direct weight replacement, equivalent mortar replacement, and direct volume replacement are compared based on concrete workability, compressive …
Concrete has been the rock star of modern architecture: it is strong, versatile, and durable, able to withstand natural and environmental disasters.However, it has a downside: it is highly contaminating, one of the leading causes of CO 2 emissions and debris, not to mention its financial cost. Fortunately, the advances in technology have taken us very …
Experimental plan. In this study, design strengths of 21, 24, and 27 MPa were considered. The quality of recycled aggregate concrete is managed by KCS 14 20 21 recycled aggregate concrete standards of the Korean Architectural Standard Specification [], and KCS 14 20 10 general concrete specifications are applied [].Based on the …
This paper puts forward a strength-based mix design method for recycled aggregate concrete using a modified empirical formula. A total of 30 mixes, the amount of cement varies from 300 kg/m 3 to 500 kg/m 3 and the proportion of recycled coarse aggregate ranges from 0% to , were prepared for the regression analysis of …
1.2. Recycled concrete aggregate and waste glass. In Hong Kong, about 66,000 tonnes/day of construction & demolition (C&D) wastes (including waste concrete) were disposed of at public fills and landfills according to the statistics of the Environmental and Protection Department (EPD) in 2016 (EPD, 2016).The large amount of C&D …
This paper puts forward a strength-based mix design method for …
After specifying the optimum mix design in the first phase of the research, to enhance the capability of the recycled concrete for use in the applications such as pavement and airport runway that split tensile strength, flexural strength and crack resistance are important, in the second phase of the research the effect of adding of ...
After one end of the rebar is buried in the recycled aggregate concrete mix and cured for a particular time, it becomes resistant to being pulled out when an external force F is applied to the other end of the rebar. This indicates the existence of forces acting at the interface between recycled aggregate concrete and rebar, i.e., bond stresses [35].
Download Citation | Study Strength of Recycled Concrete Mix Design | This paper discusses waste production of recycled aggregate concrete is used as the recycled concrete, experiment with ...
Taking flexural strength of NCA-NFA as reference strength, those of RCA-NFA, NCA-RFA, and RCA-RFA mixtures decreased by 1.89, 2.43, and 11.59%, respectively. Since the recycled concrete's flexural strength loss was less than its compressive strength loss, the recycled concrete performed better in terms of flexural …
Recycled concrete aggregates (RCA) sourced from waste concrete are a sustainable alternative to natural crushed stone aggregates. The strength and durability properties of concrete containing RCA were evaluated by a comprehensive experimental …
Concrete samples built from recycled coarse aggregates met the design strength requirements as well. ... PSTSMA method improve up to 6.35% the strength of recycled aggregate concrete made up of ...
Owing to the variations in the recycled coarse aggregates (RCA) characteristics, the compressive strength prediction of recycled aggregate concrete (RAC) is a complex challenge causing hindrance in the design guidelines development and practical application of RAC. This study aims to develop a unified compressive strength …
