SEM Image Analysis in Permeable Recycled Concretes with Silica Fume. A Quantitative Comparison of Porosity and the ITZ

Chinchillas-Chinchillas, Manuel J.; Rosas-Casarez, Carlos Antonio; Arredondo-Rea, S.P.; Gómez-Soberón, José Manuel; Higuera, Ramón Corral

doi:10.3390/ma12132201

Cited by 55 publications

(18 citation statements)

References 58 publications

(66 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The properties of recycled aggregate concrete are influenced by the replacement rate of RCA, as well as by its quality and composition [29,30]. Further, the decline of mechanical properties depends on the presence of two interfacial transition zones, which is normally between aggregate and new cement mortar, but in the case of RAC, it is also between attached old mortar and new cement mortar [31][32][33]49]. The maximal replacement ratios of coarse NA by RCA in the concrete mixture without seeing a degradation in compressive strength have been presented [34][35][36].…”

Section: Literature Review Of Mechanical Properties and Durability Ofmentioning

confidence: 99%

Environmental Assessment of Two Use Cycles of Recycled Aggregate Concrete

Pavlů¹,

Kočí

Hájek³

2019

Sustainability

View full text Add to dashboard Cite

The main goal of this study was to compare two use cycles of natural aggregate concrete and recycled aggregate concrete, which is another way to compare the environmental impacts of recycled materials. A series of concrete mixtures with various replacement ratios of primary resources with recycled ones were prepared for this study. The mechanical properties of concrete mixtures were examined and were used for the design of structural elements in the same utilized properties. The two use cycles of a structural element were compared using life cycle assessment (LCA). In the first use cycle, the LCA of the structural element containing only primary raw materials was assessed. In the second use cycle, the LCA of a structural element in which primary materials were partially replaced by recycled ones was assessed. The obtained results confirm the potential use of high-quality recycled aggregate originating from local sources in some applications in building structures. Furthermore, the environmental assessment indicates the benefits of using recycled materials, such as environmental savings, especially the reduction of primary resource use, embodied energy, and embodied emissions, as well as reduction of the pressure on landfill sites.

show abstract

Section: Literature Review Of Mechanical Properties and Durability Ofmentioning

confidence: 99%

Environmental Assessment of Two Use Cycles of Recycled Aggregate Concrete

Pavlů¹,

Kočí

Hájek³

2019

Sustainability

View full text Add to dashboard Cite

show abstract

“…Therefore, the reduction in ITZ strength is also one of the reasons for the deterioration of the mechanical properties of concrete [41,42]. This reduction in ITZ strength was also found in cement paste with recycled coarse aggregates (RCA) [43]. Compared with the compressive strength, the concrete splitting tensile strength is more sensitive to deterioration, which can better reflect the performance evolution of sulfate-eroded concrete.…”

Section: Resultsmentioning

confidence: 99%

Effect of Dry–Wet Ratio on Properties of Concrete Under Sulfate Attack

et al. 2019

View full text Add to dashboard Cite

In order to explore the drying–wetting cycle test method of concrete under sulfate accelerating erosion, the influence of dry–wet time ratio on concrete sulfate erosion was studied. Under the condition of 7 days for one cycle, five different dry–wet time ratios were designed: 1:3, 1:1, 3:1, 5:1, and 10:1. The basic properties such as compressive strength, splitting tensile strength and dynamic elastic modulus of concrete were tested. Scanning electron microscopy (SEM) was used to analyze the microstructure of concrete before and after erosion. The test results show that under the environment of sulfate drying–wetting cycle erosion, the change of mechanical properties of concrete are divided into three stages: ascending period, fluctuating period and rapid descending period. Concrete is subjected to periodic damage process of initial damage followed by filling compaction, cracking, further filling, and cracking again, in that order. Dry–wet ratio has a significant effect on concrete sulfate attack. Under the same drying–wetting cycle period, as the dry–wet ratio increases, the degree of deterioration of concrete by sulfate attack increases first and then decreases. When the dry–wet ratio is 5:1, the deterioration is the most serious.

show abstract

“…The shape and texture of the aggregate affect the properties of fresh concrete more than hardened concrete [51]. Additionally, the grading or size distribution of aggregate is an important characteristic because it determines the paste requirement for workable concrete [52]. However, in our procedure, we did not make an exact distinction between the nature and shape of the aggregate.…”

Section: Methodsmentioning

confidence: 99%

Machine Learning Techniques in Concrete Mix Design

Ziółkowski

Niedostatkiewicz

2019

Materials

View full text Add to dashboard Cite

Concrete mix design is a complex and multistage process in which we try to find the best composition of ingredients to create good performing concrete. In contemporary literature, as well as in state-of-the-art corporate practice, there are some methods of concrete mix design, from which the most popular are methods derived from The Three Equation Method. One of the most important features of concrete is compressive strength, which determines the concrete class. Predictable compressive strength of concrete is essential for concrete structure utilisation and is the main feature of its safety and durability. Recently, machine learning is gaining significant attention and future predictions for this technology are even more promising. Data mining on large sets of data attracts attention since machine learning algorithms have achieved a level in which they can recognise patterns which are difficult to recognise by human cognitive skills. In our paper, we would like to utilise state-of-the-art achievements in machine learning techniques for concrete mix design. In our research, we prepared an extensive database of concrete recipes with the according destructive laboratory tests, which we used to feed the selected optimal architecture of an artificial neural network. We have translated the architecture of the artificial neural network into a mathematical equation that can be used in practical applications.

show abstract

SEM Image Analysis in Permeable Recycled Concretes with Silica Fume. A Quantitative Comparison of Porosity and the ITZ

Cited by 55 publications

References 58 publications

Environmental Assessment of Two Use Cycles of Recycled Aggregate Concrete

Environmental Assessment of Two Use Cycles of Recycled Aggregate Concrete

Effect of Dry–Wet Ratio on Properties of Concrete Under Sulfate Attack

Machine Learning Techniques in Concrete Mix Design

Contact Info

Product

Resources

About