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 …
The aim of this study is to determine the optimum mix design of recycled concrete and so the methodology of the research is based on this purpose. Therefore, unlike the most previous studies which just only aimed to investigate the different fresh and hardened properties of the recycled concrete, the present study aims to find an …
The replacement levels of recycled aggregate were 25% and 50%, and equivalent mortar volume mix design was applied for recycled aggregate concrete. The results show that the mechanical strength of recycled aggregate concrete increases with increasing original aggregate size.
The optimum eco-friendly structural concrete mix was determined to be the combined mix consisting of 5% wood ash as a partial replacement of cement; 20% wood ash, 20% fine crushed glass, and 2% ...
The experimental results showed that when the water:cement ratio is 0.5, compared with the conventional concrete mix design method, the proposed mix design method can increase the compressive strength and elastic modulus by 5% and 22.8%, respectively, and reduce the heterogeneity degree and shrinkage value (90 days) by 8.5% and 23.4%, …
The quest for an optimized RASCC mix design, accommodating multiple constraints including mechanical performance, economic feasibility, and low-carbon environmental benefits, calls for in-depth investigation. ... Self-consolidating concrete using recycled concrete aggregate and high volume of fly ash, and slag. Constr. Build. …
Based on the orthogonal test design and range analysis method of the fresh and hardened properties of RCASCC, the optimal mix is as follows: water-binder ratio of 0.269, recycled coarse aggregate ...
Zhang et al. [22] applied RSM to the design of a recycled aggregate permeable concrete mix and found a suitable combination of aggregate gradation and …
The Contour plots in Fig 1 show that 5% SF increased the compressive strength by 3.5%, and for 10% SF, this increase was 7%. Also, 20% GGBFS led to 23% reduction in the compressive strength, and for 40% GGBFS there was a 41% reduction. However, a different trend was observed for Recycled Aggregate Concrete (RAC).
4.3. Sustainable mix design of RAC. The sustainable mix design of RAC in this research is an optimization problem with multiple objectives under certain …
Concrete Mix Design Data Required for Concrete Mix Design (i) Concrete Mix Design Stipulation (a) Characteristic compressive strength required in the field at 28 days grade designation — M 25 (b) Nominal maximum size of aggregate — 20 mm (c) Shape of CA — Angular (d) Degree of workability required at site — 50-75 mm (slump) (e) Degree ...
Existing studies on the resource utilization of CDW have predominantly focused on waste concrete, whereas research on excavated engineering soil has been relatively limited [5].Alluvial-proluvial soil is one of the most extensively distributed excavated engineering soils in South China [37].Concrete prepared using recycled …
Moreover, sriravindrarajah et al. [23] in their mix design of pervious recycle aggregate concrete stated that using aggregate size variation from 5 to 13 mm and 13 to 20 mm increased the ...
The use of recycled aggregate concrete (RAC) is undoubtedly on the increase and further research is required for more appropriate mix design methods. This paper presents the result of investigations into the mix design of RAC. The study examined experimentally two conventional and one unconventional mix design methods. The …
This article is on the development of a mix design method for self-compacting recycled aggregate concrete (SCRAC) by considering the adhered mortar content (AMC) on the surface of the aggregate.
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The compressive strength and the permeability coefficient of recycled aggregate pervious concrete based on this mix proportion are 25.07 Mpa and 6.23 mm/s, respectively, which are in line with the provisions of Technical Specification for Application of Recycled Aggregate Pervious Concrete (CJJ/T 253-2016) and can be used for …
The ingredients used in the concrete mix design were subjected to a sieve analysis to compare the gradation of the aggregates and to able to have a comprehensive few of what sort of particle size the mix contains. ... Lee H. Use of recycled tire rubbers in concrete. In: Proceedings of the third material engineering conference, infrastructure ...
Abstract This study proposes a new mix design method for C30 recycled concrete using recycled aggregate crushed from different strength source concrete …
Additionally, recycled concrete aggregates can vary in quality depending on the service life and origin of the parent concrete [48], [49], as well as the repeated use …
The case of optimization model is given here in order to find the aggregate gradation and suitable dosage combination of admixtures in mix design of recycled …
As a fine aggregate, river sand with a fineness modulus of 3.0 and a muck component of 0.7% was employed. Construction waste was used as recycled coarse aggregate with a good gradation of classes I, II, and III as per JGJ/T 240-2011 [37], and the performances are shown in Table 2.Alkali-activated natural aggregate concrete …
The mechanical properties of recycled brick aggregate concrete (RBAC) are significantly affected by design parameters such as recycled brick aggregate (RBA) replacement ratio and water-cement ratio, which not only increases the difficulty of designing RBAC by experimental or theoretical methods, but also makes the mechanical …
Figure 11 shows the relationships among porosity, strength and permeability for pervious concrete, developed using the Eqs. (3 to 5), as a function of the aggregate type. For a given porosity, Fig. 11could be used to estimate the strength and permeability of pervious concrete. As an …
Phase II work Using each of the four standard mix design methods viz., 13. code method, ACI method, RRL method and CONSTRUCTION & BUILDING MATERIALS Vol. 4 No. 4 DECEMBER 1990 189 Table fl Mix proportions of MI5 grade, natural and recycled aggregate concrete Natural Aggregate Concrete Recycled Aggregate …
The research of concrete mix proportion has never stopped. At present, there are many studies on the optimization of concrete mix proportion design. It is widely known that the calculation of concrete compressive strength is the first step of concrete mix proportion design. Some researchers, considering the mixed material proportion, …
The materials utilized in the recycled aggregate geopolymer concrete (RAGPC) mix design exhibit variations compared to those employed in conventional concrete mix designs. These distinctions encompass details regarding the types and ratios of recycled aggregates, binders, and activators (e.g., sodium hydroxide, sodium silicate) …
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 …
The concrete mix design process considers key performance parameters such as compressive strength, chloride ion penetration resistance, and carbonation resistance. ... However, the porous nature and higher water adsorption of recycled aggregate pose challenges in recycled aggregate concrete (RAC) including a reduction …
DOI: 10.1016/j.conbuildmat.2020.119776 Corpus ID: 225030913; Mix design for recycled aggregate pervious concrete based on response surface methodology …
1. Introduction. A large amount of construction waste is produced every year in the world. In China alone, more than 1.8 billion tons of construction waste is produced by demolishing old buildings every year, of which more than 70% is crushed brick waste [1].Construction waste recycling is very important to environmental protection.
The environmental impact of three types of concrete products ( aggregate concrete, recycled aggregate concrete, and CO 2 Concrete) using the same mix design but different ratios of cement and aggregate and with and without chemical additives, were assessed by the CML 2001 (baseline) method. Two functional units, one …