The Behavior of FRA Concrete with High Replacement Ratio

2018 ◽  
Vol 760 ◽  
pp. 204-209 ◽  
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.

Evaluation of Mechanical Properties of BAGcrete

2014 ◽  
Vol 984-985 ◽  
pp. 693-697
Author(s):  
K. Rekha ◽  
R. Thenmozhi
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Mineral Admixture ◽  
Partial Replacement ◽  
Hardened Concrete ◽  
Test Results ◽  
Replacement Ratio ◽  
Blended Cements ◽  
Sugarcane Bagasse Ash ◽  
Partial Cement Replacement

The usage of waste materials in making concrete gives a satisfactory solution to some of the problems related to waste management and environmental concerns. In the development of blended cements, some of the Agro wastes such as sugarcane bagasse ash, rice husk ash and wheat straw ash are used as pozzolanic materials. Few studies have been reported on the use of bagasse ash (BA) as partial cement replacement material. This research aims to study the physical and mechanical properties of hardened concrete prepared with bagasse ash as partial replacement material for cement are reported. The Portland cement was replaced with BA in the ratio of 0%, 5%, 10%, 15% and 20% of weight of cement. The compressive strength, splitting tensile strength and flexural strength of concrete at the age of 28 days were investigated. From the test results it was observed that bagasse ash is an effective mineral admixture, with 5% as optimal replacement ratio of cement.

scholarly journals Self-Compacting Concrete and Concreting Technology for Foundation Block Using 9000 Cubic Meters of Concrete

2021 ◽  
Vol 20 (4) ◽  
pp. 329-337
Author(s):  
E. I. Batyanovskiy ◽  
A. I. Bondarovich ◽  
N. N. Kalinovskaya ◽  
P. V. Ryabchikov
Keyword(s):  
Mechanical Properties ◽  
Setting Time ◽  
Physical And Mechanical Properties ◽  
Test Methods ◽  
Third Party ◽  
Hardened Concrete ◽  
Self Compacting Concrete ◽  
Foundation Slab ◽  
Concrete Mixtures ◽  
Structure Height

. The paper presents the results of the development and implementation of the technology of self-compacting heavy structural concrete and the technology of concreting with its use of the largest foundation slab in Belarus (concrete volume ~9100 m3) of a high-rise building at the facility “Construction of a multifunctional complex in Minsk within the boundaries of Filimonova Street – Avenue Nezavisimosty – Makayonka Street”. The results of research are shown, which ensured the production of self-compacting concrete of class C35/45 with water resistance up to W20 (with the required W12 according to the project) from concrete mixtures of the maximum cone expansion of the PK6 (RK6) grade for three zones of the foundation slab different in degree of reinforcement: lower, middle and upper, with a total structure height of 3.5 m and plan dimensions ~(83´34) m. The technology of continuous (seamless) concreting has been developed and implemented, which made it possible to lay ~9100 m3 of concrete into the structure without defects within 42 hours of continuous operation, and a system of technological measures that prevented temperature cracking in concrete. The homogeneity of the physical and mechanical properties of concrete, confirmed by control tests, is ensured due to the uniform supply of the concrete mixture (from six  concrete pumps at the same time) in layers 200–300 mm high with a distance between the supply points of about 5–6 m and the vertical arrangement of the “trunks” of the concrete pipes during delivery of concrete to each point, as well as the fact that the time for feeding the next volume of concrete was significantly less than the setting time of the previously laid concrete (with a total concreting speed £0.1 m/h). Standardized and original test methods for concrete mixtures, hardening kinetics and properties of hardened concrete have been used during the development, research and implementation of the project. Control tests of physical and mechanical properties and characteristics of concrete, carried out at BNTU together with authorized  organizations controlling the progress of construction, as well as in independent (third-party) organizations, have confirmed their compliance with the design requirements.

Behavior of Concrete Containing of Fine Recycled Aggregate

2016 ◽  
Vol 677 ◽  
pp. 260-265 ◽  
Author(s):  
Magdaléna Šefflová ◽  
Tereza Pavlů ◽  
Vladimír Hujer
Keyword(s):  
Czech Republic ◽  
Recycled Aggregate ◽  
Partial Replacement ◽  
Test Results ◽  
Natural Sand ◽  
The Czech Republic ◽  
Experimental Part ◽  
Concrete Mixtures ◽  
Crushed Concrete ◽  
Deformation Properties

The use of coarse recycled aggregate in concrete is already accepted in the Czech Republic but with specific restrictions. The problem is the use of fine recycled aggregate (FRA) in concrete. This paper is focused on behavior of concrete containing FRA. FRA, which originated from recycling plant in the Czech Republic, was used in an experimental part. FRA was obtained from demolished and crushed concrete structures. Four concrete mixtures were designed and prepared. The first concrete mixture was reference which did not include FRA. Natural sand was replaced by FRA in other concrete mixtures in varying ratio. There were tested physical, mechanical and deformation properties of concrete. According to test results it is possible to say that the use FRA as partial replacement of natural sand in concrete mixtures.

The Carbonation Depth of Fine Recycled Aggregate Concrete

2016 ◽  
Vol 722 ◽  
pp. 228-232 ◽  
Author(s):  
Magdaléna Šefflová ◽  
Tereza Pavlů
Keyword(s):  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Partial Replacement ◽  
Concrete Durability ◽  
Test Results ◽  
Carbonation Depth ◽  
Natural Sand ◽  
Conventional Concrete ◽  
Concrete Mixtures ◽  
Carbonation Resistance

This paper is focused on carbonation resistance of fine recycled aggregate (FRA) concrete. Durability of FRA concrete is connected with uncertainties and doubts. One of the most unknown aspects of FRA cocnrete is carbonation resistance. This paper presents results of carbonation depth of FRA concrete. The FRA was originated from crushed construction and demolition (C&D) waste. There were prepared a total four concrete mixture. The first mixture was reference, did not include the FRA. In other concrete mixtures, natural sand was replaced by the FRA in various replacement ratios, specifically 10%, 20% and 30%. All prepared concrete mixtures were designated with the same parameters for clear comparison. From the test results it is possible to say that the use of the FRA as partial replacement of natural sand in concrete influences carbonation resistance of concrete. The carbonation depth was higher for concrete samples with the use of FRA. However it is possible to say that according to the carbonation resistance, the FRA concrete is possible to be used in the same applications as conventional concrete but it is necessary to verify this results.

An Experiment Investigation on Physical and Mechanical Properties of High Strength Concrete with Suitable Admixture

2019 ◽  
Vol 972 ◽  
pp. 10-15
Author(s):  
B.C. Gayana ◽  
Mallikarjuna Shashanka ◽  
Avinash N. Rao ◽  
Karra Ram Chandar
Keyword(s):  
Mechanical Properties ◽  
High Strength Concrete ◽  
Construction Material ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Steel Fibers ◽  
Partial Replacement ◽  
Hardened Concrete ◽  
Conventional Concrete ◽  
Strength Concrete

Concrete is an essential construction material. Even-though conventional concrete performs and satisfy the structures under normal conditions, a few special situations require very high compressive strength of concrete. An experimental investigation is done to develop high strength concrete with suitable admixtures and steel fibers. The properties of fresh and hardened concrete with alccofine as partial replacement for binder and poly-carboxylate ether (Glenium 8233) and steel fibers is investigated for the workability and mechanical properties i.e., compressive, splitting tensile and flexural strength of concrete. Based on the results, the strength increased with the addition of alccofine compared to the control mix. Hence, by optimum percentage of alccofine, high strength of concrete of 112 MPa can be obtained.

scholarly journals Evaluation of the Behavior of The Physical and Mechanical Properties of Green Concrete Exposed to Magnesium Sulfate

2020 ◽  
Vol 5 (11) ◽  
pp. 1353-1356
Author(s):  
Laura Landa-Ruiz ◽  
Hilda Ariza-Figueroa ◽  
Griselda Santiago-Hurtado ◽  
Victor Moreno-Landeros ◽  
Raúl Alberto López Meraz ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aggressive Medium ◽  
Research Work ◽  
Physical And Mechanical Properties ◽  
Sugar Cane Bagasse ◽  
Partial Replacement ◽  
Control Medium ◽  
Green Concrete ◽  
Concrete Mixtures ◽  
Sugar Cane Bagasse Ash

In the present research work, four concrete mixtures were designed according to the ACI 211.1 method, the first as a control mixture, with 100% CPC, and the remaining three elaborated with partial replacement of the CPC by combinations of Sugar Cane Bagasse Ash and Silica Fume (SCBA-SF) in 10%, 20% and 30% (Green Concrete). The tests carried out on the four mixtures were physical properties (Slump, Temperature, Density) and mechanical properties as Compressive Strength (F'c) and Modulus of Elasticity, according to the ASTM and ONNCCE standards, the study specimens were exposed in water, as a control medium and a 3.5% solution of MgSO4 as an aggressive medium for a period of 28 days. The results obtained indicate a good performance of the Green Concrete in comparison with the control mixture, in particular the Green Concrete made with 10% and 20% substitution of CPC by SCBA-SF.

Study of the Mechanical Properties Development of Concrete Containing Fine Recycled Aggregate

2016 ◽  
Vol 827 ◽  
pp. 267-270 ◽  
Author(s):  
Magdaléna Šefflová ◽  
Tereza Pavlů
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Czech Republic ◽  
Recycled Aggregate ◽  
Future Research ◽  
Building Structures ◽  
Replacement Ratio ◽  
The Czech Republic ◽  
Concrete Mixtures ◽  
Concrete Properties

This paper is focused on the mechanical properties development of fine recycled aggregate (FRA) concrete. FRA was obtained from recycling plant in the Czech Republic. There were prepared four concrete mixtures in the laboratory. The first mixture was reference (REF) with fine natural aggregate (FNA). FNA was replaced in concrete mixtures R10, R20 and R30 in varying replacement ratio. The concrete mixtures R10, R20 and R30 contained 10 %, 20 % and 30 % FRA. There were tested properties of concrete. Finally, it is possible to say that the use of the FRA in concrete influences concrete properties. It is necessary to verify of probably an improvement of compressive strength of FRA concrete in future research. However, FRA concrete is possible to be used in the manufacturing of building structures, but it is necessary to test durability and lifespan of FRA concrete.

Mechanical Properties of Concrete Produced with Wastepaper for Application of Construction Materials

2014 ◽  
Vol 627 ◽  
pp. 369-372
Author(s):  
Hyun Ki Choi
Keyword(s):  
Mechanical Properties ◽  
Tensile Test ◽  
Construction Materials ◽  
Mix Design ◽  
Partial Replacement ◽  
Hardened Concrete ◽  
Mixing Ratio ◽  
Replacement Ratio ◽  
Influence Variable ◽  
Test Result

The purpose of this study was to analyze the mechanical properties of concrete produced with wastepaper for obtaining the optimum mix design of that. The concrete produced with wastepaper was made up of the cement, water, sand, and cut wastepaper. For this purpose, the concrete which had variety mixing ratio of materials was mixed and cured to find out the mechanical properties of that. And, it was performed the compressive and tensile test and the measurement of hardened concrete. The test result of this study was showed that the partial replacement ratio of wastepaper was the decisive influence variable and the correlation between the mechanical properties

Non-Destructive Testing of Concrete with Fine Recycled Aggregate

2016 ◽  
Vol 825 ◽  
pp. 63-68 ◽  
Author(s):  
Magdaléna Šefflová ◽  
Tereza Pavlů
Keyword(s):  
Physical Properties ◽  
Recycled Aggregate ◽  
Concrete Mixture ◽  
Hardened Concrete ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Natural Sand ◽  
Concrete Mixtures ◽  
Durability Testing ◽  
Non Destructive

This paper is focused on non-destructive testing of concrete containing fine recycled aggregate (FRA). FRA was obtained from demolished concrete structures and crushed in the laboratory on fraction 0 – 4 mm. There were prepared four concrete mixtures. The first concrete mixture was control, did not include FRA. In other mixtures was natural replaced natural sand by FRA. There were tested workability of fresh concrete mixture and physical properties of hardened concrete. Finally, it is possible to say that the use of FRA influences the physical properties of concrete. The physical properties of concrete are connected with the durability of concrete. Therefore, it is necessary to focus on durability testing of FRA concrete in further research.

Basic set of experiments for determination of mechanical properties of sand

2014 ◽  
Vol 62 (1) ◽  
pp. 129-137
Author(s):  
A. Sawicki ◽  
J. Mierczyński
Keyword(s):  
Mechanical Properties ◽  
Soil Mechanics ◽  
Physical And Mechanical Properties ◽  
Local Strain ◽  
Initial State ◽  
Laboratory Equipment ◽  
Additional Information ◽  
Basic Set ◽  
Initial Anisotropy

Abstract A basic set of experiments for the determination of mechanical properties of sands is described. This includes the determination of basic physical and mechanical properties, as conventionally applied in soil mechanics, as well as some additional experiments, which provide further information on mechanical properties of granular soils. These additional experiments allow for determination of steady state and instability lines, stress-strain relations for isotropic loading and pure shearing, and simple cyclic shearing tests. Unconventional oedometric experiments are also presented. Necessary laboratory equipment is described, which includes a triaxial apparatus equipped with local strain gauges, an oedometer capable of measuring lateral stresses and a simple cyclic shearing apparatus. The above experiments provide additional information on soil’s properties, which is useful in studying the following phenomena: pre-failure deformations of sand including cyclic loading compaction, pore-pressure generation and liquefaction, both static and caused by cyclic loadings, the effect of sand initial anisotropy and various instabilities. An important feature of the experiments described is that they make it possible to determine the initial state of sand, defined as either contractive or dilative. Experimental results for the “Gdynia” model sand are shown.

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