Investigating freeze-proof durability of air-entrained C30 recycled …
Incorporation of air-entraining agent has improved recycled concrete freeze-proof durability. However, it is very lacking to study the role of the entraining agent. In this paper, the influence of an air-entraining agent on freeze-proof durability for the ordinary C30 recycled coarse aggregate (RCA) concrete and air-entrained C30 RCA concrete …
Durability of Reinforced Concrete Incorporating Recycled …
The microstructure of recycled aggregate prepared from the crushing of old concrete was studied. It was found that the recycled aggregate is covered with loose particles that may prevent good bonding … Expand
Inclusion of Durability of Recycled Aggregate Concrete in …
3.1 Goal and Scope. The goal of this study is to evaluate and compare the environmental impacts of aggregate concrete, and concrete made by carbonation treated recycled aggregate (the patent name is CO 2 Concrete) produced in Australia, with various FUs applied to LCA model in terms of concrete's volume, strength, and …
Durability of Recycled Concrete after Reinforcing the …
The durability of recycled aggregate concrete (RAC) was studied with three different aggregate replacement rates (0%, 50%, and ). The test results demonstrate that the slump, compressive strength, freeze resistance, and carbonation resistance of RAC exhibit a decreasing trend as the aggregate replacement rate increases. The freeze ...
Using and optimizing the recycled aggregates in concrete: A …
Reusing aggregate from building and demolition waste can help protect the ordinary natural aggregate supply, reduce landfill demand, and drive toward a more …
Innovative prediction models for the frost durability of recycled …
Fig. 3 shows the performance of the ANN models with different architectures. As illustrated in this figure, the ANN model that had 19 neurons in the hidden layer shows the best performance with the lowest RMSE value (0.054 for the training data, 0.063 for the testing data, and 0.057 for all data), the lowest MAPE value (0.080 for the training data, …
RACBase: A cloud-based database of recycled aggregate concrete durability
Compared with natural aggregate, recycled aggregate has a higher porosity and water absorption, and a lower apparent density [4], which leads to the durability of recycled aggregate concrete (RAC) being generally lower than that of conventional concrete [5]. The accelerated laboratory test is a common practice at this stage to …
Using and optimizing the recycled aggregates in concrete: A …
It discusses the research perspectives of recycled aggregate, namely the development of "green" processing methods for recycled aggregate and additional guidance on building a database to predict the strength of recycled aggregate. ... Durability performance of concrete with recycled aggregates from construction and …
Mechanical Properties and Durability of Recycled Aggregate …
Therefore, this paper studied the mechanical properties and durability of recycled aggregate permeable concrete. At first, a few properties of the target material, including bulk density, moisture content, water absorption, compressive strength, and water permeability coefficient, were tested respectively. Then, based on the orthogonal test ...
Durability of recycled aggregate concrete using pozzolanic …
This suggests that recycled aggregate in concrete may impose a high risk to the durability of concrete structures in terms of chloride-induced corrosion of steel. Chloride ions will enter the concrete cover containing recycled aggregate more easily due to a higher rate of permeability altogether with water sorption, and subsequently reach …
Durability of recycled aggregate concrete using pozzolanic …
In this study, pulverized fuel ash (PFA) and ground granulated blast furnace slag (GGBS) were used to compensate for the loss of strength and durability of concrete containing recycled aggregate. As a result, 30% PFA and 65% GGBS concretes increased the compressive strength to the level of control specimens cast with natural granite …
Strength and Durability Performance of Recycled Aggregate …
The present study illustrates the susceptibility of optimized-quality recycled concrete aggregate (RCA) to supplementary cementitious materials (SCMs), such as …
Application of optimization‐based regression analysis for …
To improve recycled aggregate concrete (RAC) technologies in permafrost, it is essential to certify the stability in frost-induced conditions. The main goal of this study was to use support vector regression (SVR) methods to forecast the frost durability (DF) of RAC on the basis of durability
Carbonization Durability of Two Generations of Recycled …
Carbonation durability is an important subject for recycled coarse aggregate concrete (RAC) applied to structural concrete. Extensive studies were carried out on the carbonation resistance of RAC under general environmental conditions, but limited researches investigated carbonation resistance when exposed to chloride ion …
Durability of recycled aggregate concrete – A review
Recycled aggregate (RA) derived from construction and demolition waste is suitable for partial or entire replacement for aggregate when making new concrete. Using waste concrete as RA could save about 60% of limestone resources and reduce …
Mechanical features and durability of concrete incorporating recycled …
1. Introduction1.1. Concrete contained recycled coarse aggregate and nano-silica. Over the past several years during which the total life cycle concept has been put forward in the construction industry, a number of researchers have conducted some investigation about the feasibility of reusing waste concrete ingredients [1].The …
Influence of the moisture states of aggregate recycled from …
Assessment of durability of recycled aggregate concrete produced by two-stage mixing approach. J. Mater. Sci., 42 (10) (2007), pp. 3592-3602. CrossRef View in Scopus Google Scholar [73] M.C. Limbachiya, T. Leelawat, R.K. Dhir. Use of recycled concrete aggregate in high-strength concrete. Mater.
The durability of recycled aggregates and recycled aggregate …
The physical and mechanical properties of two recycled aggregates, crushed concrete and clean, graded mixed debris, have been examined and compared with results obtained for a natural river gravel . Initial characterisation tests were performed on both the recycled and natural aggregates to determine their particle size distribution and particle shape, …
Recycled Concrete Aggregates: A Review | International …
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 …
Experiment on Freezing and Thawing Durability …
Recycling old concrete as an alternative source for production new concrete can solve the environment produced by old concrete. To make such recycling feasible, the strength and durability of the recycled aggregate concrete (RAC) must be assured. Prepared recycled coarse and fine aggregate using natural concrete specimens …
Strength and Durability Evaluation of Recycled Aggregate …
This paper discusses the suitability of producing concrete with 100 % recycled aggregate to meet durability and strength requirements for different …
Recycled Aggregate: A Viable Solution for Sustainable …
2.1. Application in Concrete. C&DW can be used in concrete as coarse/fine aggregate and a finely ground material (i.e., filler). Concerning aggregate, Robalo et al. [] observed that replacing NA with C&DW progressively increases the water or superplasticizer admixture to keep the workability of concrete due to the high porosity …
Hybrid fibre reinforced recycled aggregate concrete: …
DOI: 10.1016/j.conbuildmat.2024.135044 Corpus ID: 267244365; Hybrid fibre reinforced recycled aggregate concrete: dynamic mechanical properties and durability @article{Htet2024HybridFR, title={Hybrid fibre reinforced recycled aggregate concrete: dynamic mechanical properties and durability}, author={Paing Htet and Wensu Chen …
Influence of silane-based water repellent on the durability properties
The mechanical properties and durability of recycled aggregate concrete are lower than natural aggregate concrete when the same mix proportion is used. • Both the integral water repellent method and the surface water repellent treatment method based on silane can improve the durability of recycled aggregate concrete. •
Effect of recycled aggregate treatment techniques on the durability …
1. Background. Recycling of construction waste as recycled aggregates (RA) in the concrete structures is considered a promising method to overcome natural resource depletion and environmental pollution [1].Approximately, 20% reduction in the CO 2 emission and 60% saving of natural aggregate resources can be achieved by the …
Experimental investigation of concrete incorporating recycled …
Recycled concrete (RC) produced using recycled coarse aggregate (RCA) has been the subject of numerous studies. They studied the physical characteristics of RCA, replacement ratio, mixing and curing procedures, modification techniques, workability of fresh concrete, as well as the mechanical, durability, and long-term properties of …
Effect of Nano-TiO2 and Polypropylene Fiber on Mechanical …
Secondly, the effects of PPF and nano-TiO on the durability of manufactured sand-recycled aggregate concrete were analyzed by freeze–thaw cycle test and carbonation test. The design level test of frost resistance and carbonation resistance of manufactured sand-recycled aggregate concrete was carried out by response surface …
Mechanical and Durability Properties of Recycled Aggregate …
This paper presents a study on mechanical and durability properties of concretes manufactured with recycled aggregates of different sizes and contents. A …
Durability aspects of HVFA-based recycled aggregate …
The utilisation of recycled coarse aggregate obtained from demolished concrete has gained momentum in recent years due to its contribution towards sustainability by minimising the use of artificially produced materials and eliminating environmental problems due to dumped waste materials. The present research exploited the possibility …
Improvement in freeze-thaw durability of recycled aggregate permeable
Thus, this study aims to improve the freeze–thaw durability of recycled aggregate permeable concrete without the degradation of strength and permeability. Accordingly, two silane emulsion modification methods, namely the surface modification of recycled aggregate and integral modification of cement matrix, were used to raise the …