Predicting Dynamic Segregation of Self-Consolidating Concrete from the Slump-Flow Test

Self consolidating concrete (S.C.C.) is a type of concrete which need not be provided any kind of external work for compaction and gets consolidated by own weight and thereby providing a lot of economic and technical benefits. It flows under own weight to completely fill forms and pass without segregation, through closely spaced reinforcement. Alccofine is a pozzolanic material and the ultrafine particles of Alccofine provide better workability, strength as well as the economy. Properties of M40 S.C.C. control mix was compared with S.C.C. mixes incorporating 1% of glass fiber and replacing different percentages (0%, to 15% by weight) of cement with Alccofine was studied. Optimum replacement of cement was assessed by studying properties in the fresh state and in the hardened state, and then comparing results with properties of control mix. Fresh state properties of S.C.C. were assessed by L box test, slump-flow test and V funnel test. Compressive strength, flexural strength, and splitting tensile strength tests were done to assess hardened state properties. Properties of S.C.C. in Fresh and hardened state were seen to be enhanced by addition of Alccofine and Glass fiber.

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Rheology, Strength and Durability Characteristics of Alccofine Blended Fibre Reinforced Self Consolidating Concrete

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i3.12.16026 ◽

2018 ◽

Vol 7 (3.12) ◽

pp. 209

Author(s):

Bletty Baby ◽

Jerry Anto ◽

Basil Johny ◽

Sreenath S

Keyword(s):

Steel Fibre ◽

Flow Characteristics ◽

Strength Degradation ◽

Fibre Content ◽

Split Tensile Strength ◽

Self Consolidating Concrete ◽

Slump Flow ◽

Strength Tests ◽

Hardened Properties ◽

Strength And Durability

In this study, observations were made on the effect of blending cement with fly ash and Alccofine on the fresh and hardened properties of micro steel fibre reinforced self-consolidating concrete (SCC). SCC mixes were prepared based on EFNARC guidelines. Blending has been done by replacing 5%, 10% and 15% of cement with Alccofine. Slump flow, L-box and V-funnel tests were conducted to study the flow characteristics of SCC. Compressive strength, split tensile strength, and flexural strength tests were performed to assess the strength characteristics. It was observed that the SCC with 10% replacement of cement with Alccofine showed better results than the other mixes. Further, the modification of the optimum blend with 10% Alccofine was made by adding variable percentages (0.5%, 1% and 1.5% by volume) of micro steel fibres and strength tests were conducted to optimise the fibre content. The strength degradation of the SCC with optimum Alccofine and fibre content exposed to alkaline, chloride and sulphate solutions was also studied.

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Study on Adaptability of Test Methods for Workability of Fresh Self-Compacting SFRC

Materials ◽

10.3390/ma14185312 ◽

2021 ◽

Vol 14 (18) ◽

pp. 5312

Author(s):

Xinxin Ding ◽

Haibin Geng ◽

Kang Shi ◽

Li Song ◽

Shangyu Li ◽

...

Keyword(s):

Steel Fiber ◽

Volume Fraction ◽

Test Methods ◽

Fiber Reinforced Concrete ◽

Ring Test ◽

Steel Fiber Reinforced Concrete ◽

Slump Flow ◽

Filling Ability ◽

Flow Test ◽

Passing Ability

To ensure the quality of concrete construction, the workability of fresh mix measured by rational test methods is critical to be controlled. With the presence of steel fibers, whether the test methods and evaluation indices of fresh self-compacting concrete (SCC) are adaptable for self-compacting steel fiber reinforced concrete (SFRC) needs to be systematically verified. In this paper, seven groups of self-compacting SFRC, referenced with one group SCC, were prepared by using the mix proportion design method based on the steel fiber-aggregates skeleton packing test. The main factors included the volume fraction and the length of hooked-end steel fiber. Tests for filling ability, passing ability, and stability of fresh self-compacting SFRC and SCC were carried out. Results indicate that the adaptability was well for the slump-flow test with indices of slump flow and flow time T500 to evaluate the filling ability, the J-ring flow test with an index of PA level to evaluate the passing ability, and the static segregation test with an index of static segregation resistance to evaluate the stability of fresh self-compacting SFRC. By the repeated tests and measurements, the slump cone should be vertically lifted off to a height of 300 mm within 3 s at a constant speed, the spacing of the rebar in the J-ring test should be adjusted to be two times the fiber length. If the table jumping test is used, the dynamic segregation percent should be increased to 35% to fit the result of the static segregation test. Good workability of the self-compacting SFRC prepared in this study is presented with the general evaluation of test results.

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Fresh, Durability and Mechanical Behavior of Self Consolidating Concrete Incorporating Fly Ash and Admixture under Hot Weather

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.904.453 ◽

2021 ◽

Vol 904 ◽

pp. 453-457

Author(s):

Samer Al Martini ◽

Reem Sabouni ◽

Abdel Rahman Magdy El-Sheikh

Keyword(s):

Compressive Strength ◽

Fly Ash ◽

Water Absorption ◽

Weather Conditions ◽

Chloride Penetration ◽

The Self ◽

Fresh Properties ◽

Self Consolidating Concrete ◽

Slump Flow ◽

Hot Weather

The self-consolidating concrete (SCC) become the material of choice by concrete industry due to its superior properties. However, these properties need to be verified under hot weather conditions. The paper investigates the behavior of SCC under hot weather. Six SCC mixtures were prepared under high temperatures. The SCC mixtures incorporated polycarboxylate admixture at different dosages and prolonged mixed for up to 2 hours at 30 °C and 40 °C. The cement paste was replaced with 20% of fly ash (FA). The fresh properties were investigated using slump flow, T50, and VSI tests. The compressive strength was measured at 3, 7, and 28 days. The durability of SCC mixtures was evaluated by conducting rapid chloride penetration and water absorption tests.

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Comparison of some Fresh and Hardened Properties of Self-Consolidating Concrete Composites Containing Rubber and Steel Fibers Recovered from Waste Tires

Nano Hybrids and Composites ◽

10.4028/www.scientific.net/nhc.24.8 ◽

2019 ◽

Vol 24 ◽

pp. 8-13 ◽

Cited By ~ 1

Author(s):

Hamza Bensaci ◽

Belkacem Menadi ◽

Said Kenai

Keyword(s):

Flexural Strength ◽

Volume Fraction ◽

Flow Time ◽

Steel Fibers ◽

Self Consolidating Concrete ◽

Steel Fibres ◽

Waste Tires ◽

Slump Flow ◽

Funnel Flow ◽

Recycled Steel

This paper reports on an experimental investigation using either rubber aggregates or steel fibres recycled from waste tires in the production of self-consolidating concrete composite (SCCC). Ten mixes are designed, one of them is the reference concrete. The natural aggregates are substituted by rubber particles by volume at 5, 10, 15, 20 and 30%. Recycled steel fibres are separately added to SCC mixes at volume fraction of 0.5, 0.8, 1 and 1.5%. The tested rheological properties of SCCC are slump flow diameter, T500 slump flow time, V-funnel flow time, L-box ratio, and the segregation resistance test. The compressive strength, the flexural strength, and total shrinkage are also measured on the 28 days. The experimental results show that the addition of recycled steel fibre is favorable for the SCC by means of increasing the flexural strength and reducing the shrinkage and the risk of cracking. Keywords: Self-consolidating concrete composite; Waste tires; Rubber; Steel fibers; Rheology, Strength

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Correlations between Fresh Properties of Self-Consolidating Concrete Including Palm Oil Fuel Ash

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.250-253.409 ◽

2011 ◽

Vol 250-253 ◽

pp. 409-416 ◽

Cited By ~ 5

Author(s):

Md. Safiuddin ◽

Md. Abdus Salam ◽

Mohd Zamin Jumaat

Keyword(s):

Palm Oil ◽

Flow Time ◽

Fresh Properties ◽

Palm Oil Fuel Ash ◽

Self Consolidating Concrete ◽

Slump Flow ◽

Filling Ability ◽

Fuel Ash ◽

Oil Fuel ◽

Passing Ability

Palm oil fuel ash (POFA) has been used successfully as a supplementary cementing material in various types of concrete. In the present study, self-consolidating concrete (SCC) was produced by using POFA as a partial replacement of ordinary portland cement (OPC). In total, sixteen SCC mixes were prepared by varying water to binder (W/B) ratio, POFA content, and high-range water reducer (HRWR). POFA was used by replacing 0–30% of OPC by weight at the W/B ratios ranging from 0.25 to 0.40. The filling ability, passing ability and segregation resistance of various SCC mixes were investigated. The filling ability was determined with respect to slump flow, 50-cm slump flow time, inverted slump cone flow spread and time, and V-funnel flow time. The passing ability was examined with respect to J-ring flow. In addition, the segregation resistance was assessed with regard to sieve segregation index and column segregation factor. Based on the data obtained, the correlations for the fresh properties of SCC were sought. The experimental findings showed strong correlations between most of the fresh properties of SCC.

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