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Vibration Impact on Fresh Concrete of Conventional and

Vibration Impact on Fresh Concrete of Conventional and

Vibration Impact on Fresh Concrete of Conventional and

Vibration Impact on Fresh Concrete of Conventional and UHPFRC . Sudarshan N.M.1* and Dr. T. Chandrashekar Rao2. 1Department of Civil Engineering, Satara College of Engineering Management, Satara, Maharashtra, India. *(Corresponding author ) 2 . Department of Civil Engineering, BCE Bapatla, Andhra Pradesh, India. 1ORCID: 0000-0001-8618-1241 ...

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Vibration Impact on Fresh Concrete of Conventional and

Vibration Impact on Fresh Concrete of Conventional and UHPFRC Sudarshan N.M. 1* and Dr. T. Chandrasekhar Rao 2 1 Department of Civil Engineering, Satara College of Engineering Management,

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[PDF] Vibration Impact on Fresh Concrete of Conventional ...

In general vibration is unwanted noise and harmful phenomenon for human beings In some cases vibration is beneficial in construction works in mixing, void filling, cement saving, improve quality of concrete, The vibration technique is applied to concrete industry hardly there is no structure without vibration effect, The present research paper focuses on impact of vibrator during mixing and ...

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Sudarshan, N.M. and Chandrashekar Rao, T. (2017) Vibration ...

Sudarshan, N.M. and Chandrashekar Rao, T. (2017) Vibration Impact on Fresh Concrete of Conventional and UHPFRC. International Journal of Applied Engineering Research, 12, 1683-1690. has been cited by the following article:

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Effects of blast induced vibrations on the fresh concrete ...

The experimental results show that the blast induced vibration has negative and positive effects on the strength of the fresh concrete depending on the curing time at blasting. Vibration can increase the strength within the first 1–2 days. After that period, vibration can cause cracks in the fresh concrete and reduce the strength.

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Sudarshan, N.M. and Chandrashekar Rao, T. (2017) Vibration ...

Sudarshan, N.M. and Chandrashekar Rao, T. (2017) Vibration Impact on Fresh Concrete of Conventional and UHPFRC. International Journal of Applied Engineering Research, 12, 1683-1690.

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Effects of blast induced vibrations on the fresh concrete ...

The experimental results show that the blast induced vibration has negative and positive effects on the strength of the fresh concrete depending on the curing time at blasting. Vibration can increase the strength within the first 1–2 days. After that period, vibration can cause cracks in the fresh concrete and reduce the strength.

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Control of Entrained Air and Vibration of Concrete for ...

• Includes study of vibration and handling of concrete, and impact on entrained air void system ... Vibration of Fresh Concrete 7. Rise of Spherical Particles 8 ... • Predicted “Cone of Action” goes against conventional wisdom of a “Radius of Action” (cylinder) • Consequence:

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Damage Effects of Pile Driving Vibration

On impact, the energy of the ram is imparted to the pile. It is distributed between rebound of the ram, elastic distortion of the pile, elastic and plastic deformation of the ... Assuming that 5. 0 in. /sec (particle velocity) is conservatively a safe vibration level for cured concrete, and recognizing the rate at which green concrete attains ...

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VIBRATION DESIGN OF CONCRETE FLOORS

the member (Fig. 2- c and d). Hence, the vibration design of post-tensioned members is the same as their conventionally reinforced counterparts, except that cracking is inhibited or is less in post-tensioned members. FIGURE 2 PERCEPTION OF VIBRATION Perception of vibration, and whether or not it is annoying or objectionable is highly subjective and

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The Impact of Construction Vibration on Adjacent Structures

For comparison, building impact vibration levels are often noted as a single number quantifying the peak particle velocity (PPV, in in/sec or mm/sec). In order to determine the vibration level which could have occurred at a property, the vibration-inducing equipment must be identified, and the distance between the vibration source and the

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ERGONOMIC EXPOSURES FROM THE USAGE OF

human, social and financial impact in terms of the reduction of occupational injuries and related injury compensations. This paper presents a case study of comparative analyses of the ergonomic situations for concrete workers casting with two different types of concrete, namely the conventional concrete and the self-compacting concrete (SCC).

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Concrete Mixture Design – Conventional Methods

Concrete mixture design or proportioning involves deciding the amount of cement, water, fine and coarse aggregate in a concrete mixture, to achieve a combination of the desired strength and workability. Most codes around the world offer guidelines for mixture design, which are primarily based on strength.

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Research brief: Limiting the Effect of Pile-Driving ...

driving from early-age concrete and limit how soon pile driving can occur after the concrete has been placed. While the the impacts of pile-driving vibration on existing structures has been well estab-lished, fewer studies have evaluated the impacts on fresh concrete and

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Fresh concrete - SlideShare

Aug 24, 2013  Fresh concrete 1. Definition of fresh concrete: Introduction: The potential strength and durability of concrete of a given mix proportion is very dependent on the degree of its compaction. It is vital, therefore, that the consistency of the mix be such that the concrete can be transported, placed, and finished sufficiently early enough to attain the expected strength and durability.

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Effect of pre-stress on natural vibration frequency of the ...

To study the relationship between the natural vibration frequency of continuous steel beam and the pre-stress, based on two methods, namely experiments and numerical simulation, the continuous beam model under different pre-stress values was excited through using the hammering method, and the acquired vibration signal was divided and analyzed dependent on Fast Fourier Transformation (FFT)

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Vibration control - concretecentre

Concrete industry sustainable construction strategy; Vibration control. The construction of lighter and longer floor structures in recent years has resulted in an increasing incidence of floor vibration. For buildings where users or equipment are sensitive to movements, tight vibration criteria are appropriate.

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Transmission of Impact Vibration on Concrete and Mortar Sheets

Jun 25, 2015  The present work exposes an alternative system for detecting vibrations generated by impact on concrete and mortar sheets. In order to carry out the tests it is necessary to implement a system of measurement different than the one proposed by the current UNE EN 140-7. This system consists of an amplifier and a striking device that is also able to measure the deformation of the

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Control of Entrained Air and Vibration of Concrete for ...

• Includes study of vibration and handling of concrete, and impact on entrained air void system ... Vibration of Fresh Concrete 7. Rise of Spherical Particles 8 ... • Predicted “Cone of Action” goes against conventional wisdom of a “Radius of Action” (cylinder) • Consequence:

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Transmission of Impact Vibration on Concrete and Mortar Sheets

Jun 25, 2015  The present work exposes an alternative system for detecting vibrations generated by impact on concrete and mortar sheets. In order to carry out the tests it is necessary to implement a system of measurement different than the one proposed by the current UNE EN 140-7. This system consists of an amplifier and a striking device that is also able to measure the deformation of the

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Technical Report Documentation Page - New Hampshire

vibration producing activity and evaluate the impact that activity would have on man-made structures and/or vibration sensitive equipment that is in relevant proximity to the project site. A “Construction Vibration Impact Assessment Table” (Appendix A, Table 1) was also developed, providing a means of rating the potential impact of a specific

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PROTECTING THE ENVIRONMENT DURING CONSTRUCTION

vibration, dust, and traffic impacts (DETR 2000). The selection of on-site vs. off-site recycling will heavily influence local impacts, which may be most pronounced when operations occur in urban settings. The nature of concrete recycling operations, however, is such that noise and vibration cannot entirely be eliminated (O’Mahony 1990).

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The Impact of Construction Vibration on Adjacent J.S. Held

For comparison, building impact vibration levels are often noted as a single number quantifying the peak particle velocity (PPV, in in/sec or mm/sec). In order to determine the vibration level which could have occurred at a property, the vibration-inducing equipment must be identified, and the distance between the vibration source and the ...

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One Thing: Concrete Consolidation - National Precast ...

Sep 19, 2019  At the start of the vibration procedure a large quantity of entrapped air bubbles can be seen escaping the concrete at the surface. As vibration continues, the rising of air pockets slows and a sheen will appear over the concrete surface. The sound of the vibrator will deepen as it densifies the fresh concrete.

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Bugholes - Portland Cement Association

A proper amount of vibration sends both entrapped air and excess water to the free surface of the concrete – either vertically winding through the matrix or laterally in a direct route to the form wall. Improper vibration will either insufficiently liberate the voids or over-consolidate the concrete resulting in segregation and bleeding.

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Environmental Considerations in Concrete Recycling

Mar 29, 2017  • RCA concrete tends to leach higher levels of metals than conventional concrete • Leachability of metals depends on type of metal, pH, carbonation, and mobility characteristics (Galvin et al. 2014) 27 Use of RCA in concrete mixtures mitigates water quality issues associated with leaching.

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What is Workability of Concrete? - Gilson Co.

For the ASTM C143 and AASHTO T 119 slump test, A Slump Cone is placed on a solid, level base and filled with fresh concrete in three equal layers rodded in a specified manner to consolidate. The concrete is struck even with the top of the cone, and the cone is carefully lifted away. The sample then settles, or slumps and the final height is subtracted from the original height of the cone and ...

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(PDF) Literature Survey on Self-Compacting Concrete ...

In addition, the most replacement of 5, 10, 15, 20 and 25% of common Portland important problem from the use of SCC is that it costs 20 cement by fly-ash and of 2.5, 7.5 and 12.5% by silica fume. to 50% more than conventional concrete because it The use of silica fume improved the fresh property requires more cement, binder and chemical admixture.

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Environmental and Economic Optimization of a Conventional ...

This research optimizes the environmental impact of a conventional building foundation in Northern Europe while considering the economic cost. The foundation is composed of piles and ground beams. Calculations are performed following relevant building Eurocodes and using life cycle assessment methodology. Concrete and steel accounted for the majority of the environmental impact of

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Structural Integrity Assessment of Precast Concrete Slabs ...

Precast slabs were tested, consisting of ceramic blocks supported by concrete ribs and with a concrete topping a few centimeters thick. These structures are very common in Brazil, being employed for the construction of houses and small buildings. In one of the tested slabs, recycled coarse aggregate was employed while conventional aggregate (granite gravels and quartz sand) was employed in the ...

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Noise and Vibration - cpuc.ca.gov

6 vibration receptors that could be affected by the Proposed Project, and evaluates the 7 potential noise and vibration impacts of the Proposed Project. Mitigation measures to avoid 8 . or reduce impacts are identified, as appropriate. 9 . 15.2 Overview of Noise and Vibration Concepts and .

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