Self-Compacting and Conventional Concrete with Mineral Waste: Fresh and Hardened State Properties

2012 ◽  
Vol 517 ◽  
pp. 547-555 ◽  
Author(s):  
Edgar Bacarji ◽  
V.C. Marques ◽  
Romildo Dias Toledo Filho
Keyword(s):  
Attractive Alternative ◽  
Self Compacting Concrete ◽  
Natural Sand ◽  
Conventional Concrete ◽  
Environmental Preservation ◽  
State Tests ◽  
Fine Aggregates ◽  
Alternative Materials ◽  
Hardened State ◽  
Mineral Waste

Environmental preservation has been a theme debated in virtually every country in the world. Many measures are being taken to reduce the environmental impact due to unplanned development. Growing environmental restrictions to the exploitation of sand from riverbeds have resulted in a search for alternative materials to produce fine aggregates, particularly near to larger metropolitan areas. Artificial fine aggregates then appear as an attractive alternative to natural fine aggregates for concrete. This work is the final part of a study about the use of residues in concretes. Conventional Concrete (CC) and Self-compacting concrete (SCC) were developed replacing the natural sand by two types of mineral waste. Fresh state tests such as slump-flow, L-box, V-funnel test and column test were performed according to the Brazilian standards. The rheological characteristics (yield stress and plastic viscosity) of the SCC were determined using the BTRHEOM rheometer. At the hardened state, compressive strength was determined at 3, 14 and 28 days of age. Modulus of elasticity test was carried out at 28 days. Curves to mixture design were obtained to SCC and CC. For all mixtures and properties analyzed the good performance of the mineral waste used was proven. Finally and more important, it was demonstrated that it is possible to obtain structural self-compacting concrete, self-compacting concrete without structural purposes and conventional concrete by using mineral waste that works like fine aggregates and that on the other hand, without any destination, would cause serious environmental impacts.

Seashells and Oyster Shells: Biobased Fine Aggregates in Concrete Mixtures

2022 ◽  
Author(s):  
Giuliana Scuderi
Keyword(s):  
Compressive Strength ◽  
Relevant Literature ◽  
Primary Component ◽  
Natural Sand ◽  
Conventional Concrete ◽  
Air Content ◽  
Concrete Mixtures ◽  
Fine Aggregates ◽  
Alternative Materials ◽  
Mixing Water

The construction industry is the largest global consumer of materials, among which sand plays a fundamental role; now the second most used natural resource behind water, sand is the primary component in concrete. However, natural sand production is a slow process and sand is now consumed at a faster pace than it’s replenished. One way to reduce consumption of sand is to use alternative materials in the concrete industry. This paper reports the exploratory study on the suitability of aquaculture byproducts as fine aggregates in concrete mixtures. Seashell grit, seashell flour and oyster flour were used as sand replacements in concrete mixtures (10%, 30% and 50% substitution rates). All the mixtures were characterized in fresh and hardened states (workability, air content, compressive strength and water absorption). Based on compressive strength, measured at 7 and 28 days, seashell grit provided the most promising results: the compressive strength was found to be larger than for conventional concrete. Moreover, the compressive strength of the cubes was larger, when larger percentages of seashell grit were used, with the highest value obtained for 50% substitution. However, for oyster flour and seashell flour, only 10% sand substitution provided results comparable with the control mixture. For the three aggregates, workability of concrete decreases with fineness modulus decrease. For mixtures in which shell and oyster flour were used with 30% and 50% substitution percentages, it was necessary to increase the quantity of mixing water to allow a minimal workability. In conclusion, considering the promising results of the seashell grit, it is suggested to study further the characteristic of the material, also considering its environmental and physical properties, including acoustic and thermal performances. Higher substitution percentages should also be investigated. This research adds to the relevant literature in matter of biobased concrete, aiming at finding new biobased sustainable alternatives in the concrete industry.

scholarly journals Flexural, Tensile and Compressibility Behavior of Self Compacting Concrete by using Glass Fibers

2019 ◽  
Vol 9 (2) ◽  
pp. 1094-1098
Keyword(s):  
Aspect Ratio ◽  
Volume Fraction ◽  
Glass Fibers ◽  
Fiber Reinforced ◽  
Self Compacting Concrete ◽  
Split Tensile Strength ◽  
Glass Fiber Reinforced ◽  
Fine Aggregates ◽  
Fresh State ◽  
Hardened State

“Fiber Reinforced Self Compacting Concrete” (FRSCC) is composed of cement, different sizes of coarse and fine aggregates, which integrate with fiber. In this current investigation, M40 grade Self Compacting Concrete reinforced with glass fibers has been developed using the Nan Su method. Fresh state and hardened state properties of Glass Fiber Reinforced Self Compaction Concrete are studied for glass fibers of different aspect ratio (875, 1285 & 1714) and percentage of volume fraction (0, 0.25, 0.5, 0.75 & 1). From the investigation carried out it is found that incorporation of glass fibers of aspect ratio 1285 and percentage of volume fraction 0.5 to SCC attains better compressive and flexural strength compared to other mixtures and also incorporation of glass fibers of aspect ratio 1285 and percentage of volume fraction 0.75 to SCC attains better split tensile strength compared to other mixtures.

scholarly journals “Experimental Analysis of M35 Concrete with Partial Substitute of Fine Aggregate by Nylon Glass Filled Granules and Cement by Flyash”

2019 ◽  
Vol 9 (1) ◽  
pp. 4469-4474
Keyword(s):  
Tensile Strength ◽  
Construction Industry ◽  
Experimental Analysis ◽  
Steel Fiber ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Natural Sand ◽  
Conventional Concrete ◽  
Fine Aggregates ◽  
Hardened Properties

Concrete is a material which widely used in construction industry. The present investigation deals with the study of partial replacement of fine aggregate by Nylon Glass Granules in concrete. The fine aggregates are replaced by 0%, 10%, 20% and 30% by Nylon Glass Granules by volume of natural sand in M35 grade of concrete. Additionally, to increase the tensile strength of concrete 1% of Steel Fiber by volume of cement were added to all the mixes containing Nylon Glass Granules. The concrete produced by such ingredients were cured for 7 and 28 days to evaluate its hardened properties. The 28days hardened properties of concrete revealed that maximum strength is observed for the mix which possesses 20% replacement of fine aggregate by Nylon Glass Granules compared with the conventional concrete, thus it is said to be the optimum mix

Eco-Friendly and Cost-Effective Design of Concrete Pavement Using Used Foundry Sand and Tiles Dust

2018 ◽  
Vol 23 ◽  
pp. 46-54 ◽  
Author(s):  
B. Ahmed ◽  
S.M.Z. Islam ◽  
Md.T. Hossen ◽  
H. Ahmed ◽  
M.R. Islam
Keyword(s):  
Flexural Strength ◽  
Concrete Pavement ◽  
River Sand ◽  
Natural Sand ◽  
Conventional Concrete ◽  
Foundry Sand ◽  
Alternative Materials ◽  
River Erosion ◽  
The Cost ◽  
Pavement Thickness

Concrete is the most undisputable material being used in infrastructure development throughout the world. Natural sand is a prime material used for the preparation of concrete. Nowadays river erosion and other environmental issues have led to the scarcity of river sand. The reduction in the sources of natural sand and in the cost of concrete production has resulted in the increased need to find new alternative materials to replace river sand, so that excess river erosion is prevented and high strength concrete is obtained at lower cost. The aim of the study is to minimizes the cost and achieve sustainable development of concrete pavement. Cement, sand and aggregate are basic needs but the new alternative materials that is used foundry sand which is generated by metal casting industry and in the tiles industry, about 15%-30% production goes as waste, these are partially replaced by river sand. The fine aggregate has been replaced by used foundry sand accordingly in the range of 10%, 20%, 30%, 40% & 50% by weight and also same for tiles dust for M-20 grade concrete. Concrete mixtures are produced to make (6 in × 6 in × 6 in) cube for compressive strength test at 7, 14, 28 days and (4 in × 4 in × 20 in) beam for flexural strength test at 28 days curing period, tested and compared in terms of compressive and flexural strength with the conventional concrete. Maximum compressive and flexural strength are found for 20% replacement of used foundry sand (FA2) and for 10% replacement of tiles dust (TA1) with respect to the conventional concrete (A0). By using alternative materials, the strength of concrete was increased significantly and for showing cost effectiveness a concrete pavement from Talaimari MOR to Kalpona Cinema Hall was designed for 4500 commercial vehicles per day. The pavement thickness required for conventional concrete is 28 cm whereas the pavement thickness required for concrete FA2 and TA1 are 22 cm and 24 cm respectively. Since the thickness of pavement slab is reduced, the cost of pavement construction is reduced almost 22% and 15% for concrete FA2 and concrete TA1 respectively.

scholarly journals Influence of the Fibre Distribution and Orientation in the Fracture Behaviour of Polyolefin Fibre Reinforced Concrete

2018 ◽  
Author(s):  
Alejandro Enfedaque ◽  
Marcos G. Alberti ◽  
Jaime C. Gálvez
Keyword(s):  
Reinforced Concrete ◽  
Constitutive Relations ◽  
Cohesive Crack ◽  
Homogeneous Distribution ◽  
Attractive Alternative ◽  
Fibre Reinforced Concrete ◽  
Self Compacting Concrete ◽  
Conventional Concrete ◽  
Three Point Bending ◽  
Fracture Tests

Polyolefin fibre reinforced concrete (PFRC) has become an attractive alternative to steel for the reinforcement of concrete elements mainly due to its chemical stability and the residual strengths that can be reached with lower weights. The use of polyolefin fibres can meet the requirements in the standards, although the main constitutive relations are based on the experience with steel fibres. Therefore, the structural contributions of the fibres should be assessed by inverse analysis. In this study, the fibre dosage has been fixed at 6kg/m³ and both self-compacting concrete and conventional concrete have been used to compare the influence of the positioning of the fibres. An idealized homogeneous distribution of the fibres with such fibres crossing from side to side of the specimen has been added to self-compacting concrete. The experimental results of three-point bending tests on notched specimens have been reproduced by using the cohesive crack approach. Hence, the constitutive relations were found. The significance of this research relies on the verification of the formulations found to build the constitutive relations. Moreover, with these results it is possible to establish the higher threshold of the performance of PFRC and the difficulties of limiting the first unloading branch typical of fracture tests of PFRC.

scholarly journals Evaluation of the impact of two types of steel fibers (SE), mono and 3D, on concrete properties, when added isolated or blended

2020 ◽  
Vol 13 (3) ◽  
pp. 464-482
Author(s):  
A. L. BAUER ◽  
H. EHRENBRING ◽  
D. SCHNEIDER ◽  
U. C. M. QUININO ◽  
B. TUTIKIAN
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Steel Fibers ◽  
Conventional Concrete ◽  
State Tests ◽  
Brittle Behavior ◽  
The Matrix ◽  
Hardened State ◽  
Axial Compressive Strength ◽  
The Impact

Abstract The brittle behavior of concrete can be compensated by the addition of reinforcements, providing benefits such as improved crack control, residual strength and increased flexural strength. It is usual to apply mono fibers to concrete, but their positioning in the matrix may not be homogeneous, consequently increasing the susceptibility to fracture planes with fewer reinforcements. This study aimed to evaluate the use and behavior of simple (mono) and space (3D) steel fibers (SE), in order to achieve a more homogeneous mixture, increase the effectiveness of fibers in restricting cracks and improve mechanical properties. The fresh-state was assessed through slump and VeBe tests, whereas the hardened-state tests comprised axial compressive strength, flexural strength and the flexural toughness factor. The volume content of simple and space fibers varied from 0 to 0.93%. Based on the results, it can be stated that space and simple fiber contents improved rheological and mechanical properties of the composite in isolated (0.29%) and hybrid (0.64%) combinations, since their overall performance exceeded the other mixtures’. However, space fibers caused considerable workability losses compared to the conventional concrete, hindering its casting and harming its hardened-state properties.

scholarly journals STUDY ON UTILIZATION OF ZEOLITE AND STONE DUST IN CONCRETE

2020 ◽  
Vol 4 (5) ◽  
pp. 93-97
Author(s):  
Leela Prasanth U ◽  
Karan Kumar H ◽  
Afzal Basha Syed
Keyword(s):  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Split Tensile Strength ◽  
Natural Sand ◽  
Pozzolanic Material ◽  
Fine Aggregates ◽  
Stone Dust ◽  
Alternative Materials

Concrete is a compound material composed of fine aggregates and coarse aggregate bonded together with fluid cement that hardens over time.The deficit of natural sand arises the need of alternative materials for replacement of natural sand. The squashed stone residue which is locally accessible modern strong waste material is ordinarily utilized as a fine aggregate in concrete. In the current examination, an exploratory program was carried out to consider the compressive and split tensile quality of concrete made utilizing stone residue as halfway substitution of fine aggregate at an increment of 10%. Zeolite is a pozzolanic material and its pozzolanic action improves the compressivestrength of concrete. Natural zeolites are supplementary cementitious materials. By adding zeolite, the investigation on the experiments will be carried out to determine the compressive strength and split tensile strength of concrete made using zeolite as partial replacement of cement up to 20 percent at an interval of 5 percent just as the way Stone dust is being replaced to achieve the objective of the project, M30 grade of concrete is prepared. The cube and cylindrical samples shall be tested after a curing period of 7 & 28 days.

scholarly journals Durability Properties of Self Compacting Concrete by using M-Sand as Fine Aggregate

2019 ◽  
Vol 8 (3) ◽  
pp. 8354-8358
Keyword(s):  
Fine Aggregate ◽  
Self Compacting Concrete ◽  
River Sand ◽  
Natural Sand ◽  
Manufactured Sand ◽  
Durability Properties ◽  
Fine Aggregates ◽  
Alternative Material ◽  
Chloride Attack ◽  
Level Constant

Self-compacting concrete is also called as self consolidated concrete which does not require vibration for placing and compaction. In the present trend scarcity of natural sand become a huge problem to construction industry, inorder to reduce this problem alternatives are used, one of the alternative material is Manufactured sand. Manufactured sand is produced from hard granite stone by crushing. There are two reasons to M-sand i.e, availability & transportation. An attempt was made to evaluate the workability and strength characteristics & durability properties of self compacting concrete with river sand and manufactured sand as fine aggregates. For each replacement level, constant workability was maintained by varying the dosage of superplasticizer. Sulphate attack and chloride attack of the specimens were determined. Different proportions of solution are used for durability study.

Behavior improvement of self-compacting concrete in hot weather

2019 ◽  
Vol 10 (4) ◽  
pp. 89 ◽  
Author(s):  
Mounir M. Kamal ◽  
Zeinab A. Etman ◽  
Alaa A. Bashandy ◽  
Mohammed Nagy
Keyword(s):  
Drying Shrinkage ◽  
Test Results ◽  
Self Compacting Concrete ◽  
Conventional Concrete ◽  
Second Stage ◽  
Hardened State ◽  
Hot Weather ◽  
C 50 ◽  
Two Stages ◽  
Better Than

The main aim of this research is studying the effect of hot weather on the properties of self-compacting concrete and conventional concrete in both fresh and hardened state. Also, this research extends to improve the behavior of self-compacting concrete in hot weather. The main parameters were surrounding weather temperature (5°C, 20°C and 35°C), concrete materials temperatures’ (25°C, 50°C), curing temperatures (25°C and 50°C) and admixtures (using a retarder). Two stages were carried out to achieve the research aim. The behavior of self-compacting concrete compared to conventional concrete was evaluated in the first stage. Based on the first stage, attempts to enhance the concrete properties were evaluated in the second stage. Precautions on mixing and placing concrete in these climates are considered. Results are a drive in terms of; workability tests, compressive strength, splitting tensile strength, and flexural strength. Test results showed that self-compacting concrete behavior and strengths were better than conventional concrete. Slump test, J-ring and V-funnel test were used to evaluate the fresh properties of the self-compacting concrete. Drying shrinkage of self-compacting concrete in hot weather were also evaluated.

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