Experimental Study of the Physical and Mechanical Properties of Recycled Aggregate Pervious Concrete

Epoxy asphalt has fundamentally changed the thermoplastic of asphalt and endowed the asphalt with excellent physical and mechanical properties. This paper analyses the developing technical requirement of thermosetting epoxy asphalt and points out its main problems during preparation and application process. Aiming at the steel deck paving characteristics, the author has independently developed epoxy asphalt binder and tested its performances, the results have showed that this binder can meet the basic requirement of various pavings, and its further research are in process.

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Study on Performance of Recycled Aggregate Concrete

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.477.280 ◽

2011 ◽

Vol 477 ◽

pp. 280-289 ◽

Cited By ~ 1

Author(s):

Shao Wei Yao ◽

Zhen Guo Gao ◽

Chang Rui Wang

Keyword(s):

Mechanical Properties ◽

Coarse Aggregate ◽

Physical And Mechanical Properties ◽

Recycled Aggregate Concrete ◽

Recycled Aggregate ◽

Chemical Solution ◽

Aggregate Concrete ◽

Recycled Coarse Aggregate ◽

Natural Aggregate ◽

Strength And Durability

The properties of recycled coarse aggregate and the slump, the physical and mechanical properties and durability of recycled aggregate concrete were studied through tests. The results indicate that the slump, compressive strength and durability of concrete with recycled aggregate are lower than that of concrete with natural aggregate when recycled coarse aggregate fully absorbs water. However, the slump can be similar to that of concrete with natural aggregate. The properties of recycled aggregate concrete can be improved by strengthening the recycled coarse aggregate, and it is also found that the recycled coarse aggregate strengthened by grinding is superior to that soaked by chemical solution.

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Recycled Mortars with Ceramic Aggregates. Pore Network Transmutation and Its Relationship with Physical and Mechanical Properties

Materials ◽

10.3390/ma14061543 ◽

2021 ◽

Vol 14 (6) ◽

pp. 1543

Author(s):

Francisca Guadalupe Cabrera-Covarrubias ◽

José Manuel Gómez-Soberón ◽

Carlos Antonio Rosas-Casarez ◽

Jorge Luis Almaral-Sánchez ◽

Jesús Manuel Bernal-Camacho

Keyword(s):

Mechanical Properties ◽

Image Analysis ◽

Open Porosity ◽

Gas Adsorption ◽

Physical And Mechanical Properties ◽

Recycled Aggregate ◽

Bet Surface Area ◽

Sem Image ◽

The Relationship ◽

Sem Image Analysis

The porosity of mortars with recycled ceramic aggregates (10, 20, 30, 50, and 100% as a replacement of natural aggregate) was evaluated and analyzed using three different techniques. The results of gas adsorption (N2), Scanning Electron Microscopy (SEM) image analysis and open porosity allowed establishing the relationship between the recycled aggregate content and the porosity of these mortars, as well as the relationship between porosity and the physical and mechanical properties of the mortars: absorption, density, compressive strength, modulus of elasticity, and drying shrinkage. Using the R2 coefficient and the equation typology as criteria, additional data such as Brunauer, Emmett, and Teller (BET) surface area (N2 adsorption) established significant correlations with the mentioned properties; with SEM image analysis, no explanatory relationships could be established; and with open porosity, revealing relationships were established (R2 > 0.9). With the three techniques, it was confirmed that the increase in porosity is related to the increase in the amount of ceramic aggregate; in particular with gas adsorption (N2) and open porosity. It was concluded that the open porosity technique can explain the behavior of these recycled mortars with more reliable data, in a simple and direct way, linked to its establishment with a more representative sample of the mortar matrix.

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The Behavior of FRA Concrete with High Replacement Ratio

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.760.204 ◽

2018 ◽

Vol 760 ◽

pp. 204-209 ◽

Cited By ~ 1

Author(s):

Magdaléna Šefflová

Keyword(s):

Mechanical Properties ◽

Physical And Mechanical Properties ◽

Absorption Capacity ◽

Recycled Aggregate ◽

Partial Replacement ◽

Hardened Concrete ◽

Replacement Ratio ◽

Natural Sand ◽

Concrete Mixtures

This study deals with determination of the properties of the fine recycled aggregate (FRA) concrete with partial replacement of natural sand in concrete mixtures. The FRA was obtained from concrete waste and crushed on fraction 0 – 4 mm by laboratory jaw crusher. The geometrical and physical properties of natural sand and the FRA were tested. The main goal of this study is evaluation of the basic physical and mechanical properties of the concrete with partial natural sand replacement by the FRA such as workability, water absorption capacity, compressive strength and flexural strength. A total four concrete mixtures were prepared. The first concrete mixture was prepared only with natural sand, did not include the FRA. In other concrete mixtures, natural sand was replaced by the FRA in various replacement ratios (40 %, 50 %, and 60 %). All concrete mixtures were designated with the same parameters for clear comparison. The workability of fresh concrete mixtures and physical and mechanical properties of hardened concrete were tested.

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Performance Enhancement of Recycled Aggregate Concrete – An Experimental Study

Applied Science and Engineering Progress ◽

10.14416/j.asep.2021.07.003 ◽

2021 ◽

Author(s):

Sivamani Jagan ◽

Thurvas Renganathan Neelakantan ◽

Palaniraj Saravanakumar

Keyword(s):

Mechanical Properties ◽

Experimental Study ◽

Elastic Modulus ◽

Performance Enhancement ◽

Recycled Aggregate Concrete ◽

Recycled Aggregate ◽

Aggregate Concrete ◽

Coarse Aggregates ◽

Durability Properties ◽

Concrete Mixtures

Extensive studies have been performed on the mechanical and durability properties of the concrete prepared with recycled coarse aggregates (RCA), however, only modest consideration has been given to the studies on the behaviour of RAC prepared by alternative mixing approach techniques. This study presents the mechanical properties of the recycled aggregate concrete (RAC) with different percentages of RCA prepared by normal mixing approach (NMA), two-stage mixing approach (TSMA) and sand enveloped mixing approach (SEMA) techniques. The manufactured concrete mixtures were tested for compression, tension, flexure and elastic modulus at 7, 28 and 90 days. The results indicate that the mechanical properties of the RAC (with 100% of RCA) prepared through TSMA and SEMA were improved by 9.36 and 12.14% at 28 days. Perhaps, prolonged curing to TSMA and SEMA mixtures improved the mechanical properties of the RAC that is nearly equal to normal aggregate concrete (NAC) prepared by NMA.

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