Effects of blast induced vibrations on the fresh concrete

When a blast occurs in close proximity to, or in contact with, concrete components, localized damage like concrete spall and cratering may happen. Under this condition, assessing damage is of importance and significance for structural protective design. Pressure-impulse diagrams are widely adopted for evaluating blast induced damage.

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CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Research by Allen Hulshizer indicates that vibration on fresh and maturing concrete does not affect its final properties. However, his investigation maintained such a broad focus on the effects of vibration on concrete that specific time periods may need further investigation.

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studies which aim was to research the effect of temperature on self-compacting concrete workability, showed that the behaviour of fresh SCC at varying temperatures differs from that of normal vibrated concrete. The paper presents the study of rheological properties of fresh self-compacting concrete mixtures made with portland, blast furnace and

EFFECTS OF SALT WATER ON CONCRETE – CIVIL ENGINEERING PROJECT TOPICS. Concrete is an artificial engineering material made from a mixture of Portland cement, water, fine and coarse aggregates, and a small amount of air. It is the most widely used construction material in the world.

Effects of blast induced vibrations on the fresh concrete lining of a shaft. Tunneling and Underground Space Technology. 2005 page 356–361. DOI: 10.1016/j.tust.2005.01.001

distinguish between the two nor indicate that the type of vibration can have different effects on a structure. It is important to keep the two types of vibration in mind when setting vibration limits. 2.3 Vibration Propagation Vibration travels through the ground from the point at which energy is imparted (e.g., blast),

Every building structure has a natural frequency of vibration. Houses have low natural frequencies. The human ear can hear sound frequency between the range of 20 Hz and 20,000 Hz; but our best hearing is in the range of 1,000 Hz to 5,000 Hz.

Yang J H, Lu W B, Jiang Q H, Yao C, Zhou C B. Frequency comparison of blast-induced vibration per delay for the full-face millisecond delay blasting in underground opening excavation. Tunnelling & Underground Space Technology. 2016; 51:189–201. View Article Google Scholar 29.

Influence of Blasting Vibration on Young Concrete Bridge: IntheprojectofShanghai-Chongqingexpressway,blast-ing effect existed on the Yesanhe Super Large Bridge in so we could compare vibration velocity amplification effect of box girder with different length. Through analyzing monitoring data of 3#, 4# pier

This study focusses on understanding the influence of processed granulated blast furnace (PGBS) slag on fresh and hardened state properties of concrete. Nowadays, metallurgical slags are being explored as alternative materials to natural aggregates in concrete.

Health Effects. Exposure to loud noise kills the nerve endings in our inner ear. More exposure will result in more dead nerve endings. The result is permanent hearing loss that cannot be corrected through surgery or with medicine. Noise-induced hearing loss limits your ability to hear high frequency sounds and understand speech, which seriously impairs your ability to communicate.

Vibration induced by drilling and blasting excavation process in high in-situ stress area 607 P Yan, W.B. Lu, Y. Luo & M. Chen Monitoring of blast-induced vibration effects on structures by fiber Bragg grating 617 C Drebenstedt J. & Ortuta 3D hydrocode analyses of a mechanically stabilized earth retaining wall

Vibration Induced By Rapid Impact Compaction on Granular Soils Authors: Omar El Khaled, Emmanouil Spyropoulos, Omar Maalej Numerical Studies on the Effects of Mooring Configuration and line Diameter on the Restoring Behaviour of a Turret- Moored FPSO Probabilistic Inference Approach for Predicting Concrete Compressive Strength - A

induced excitation such as walking, running and jumping and define a set of design guidelines for future implementation regarding vibration serviceability of footbridges in Iceland. The first bridge is a continuous 86 m long post-tensioned concrete bridge in five spans (max. 23.5m), the second bridge

concrete materials (such as fly ash and ground granulated blast furnace slag) and mix proportions (such as cement content), but also fresh concrete placement temperature, curing methods, and time of form removal have noticeable effects on thermal cracking.

Effects of vibrations on both plastic and hardened concrete are well known. Vibrations help to consolidate plastic concrete, while vibrations of considerable intensity may be sustained without damage by hardened concrete (6,9).

PhD Students. Mr Zhejian Li (PhD student): Development of Sandwich Structures against Blast and Impact Loading.; Mr Cheng Yuan (PhD student): Static and Dynamic Bonding Behaviour of FRP and Reinforced concrete interface.; Mr Andrew Lacey (PhD student): Structural Response of Modular Buildings to Multiple Hazards.; Mr Huawei Li (PhD student): Structural Performance of Precast Concrete Joints

Concrete Structures. Using in-house ANACAP software program, to predict of the thermally induced stress behavior of the structure based on the established geometry and concrete mix laboratory test results. As a result, estimates of concrete mechanical properties and recommendations for placement

The higher amount of water in the fresh concrete, the greater the drying shrinkage affects. The shrinkage potential of a particular concrete is influenced by the amount of mixing, the elapsed time after the addition of water, temperature fluctuation, slumping, placement, and curing. The makeup of concrete is also very important.

sufficient yield value also viscosity of fresh mix. By increasing cement quantity the costs and temperatures increases, thus the use of additions like fly ash, blast furnace slag and limestone filler good improve the properties of concrete mix sans increasing its cost (Aslani and Nejadi, 2012a,b,c,d, 2013). Concrete has some disadvantages,

the Effects of Induced Vibration on Concrete at Early Ages EFRI 04/A01 July 2004 Engineering Forensics Research fresh concrete may be vulnerable to damage from vibration and, therefore, experience a reduction of ultimate strength. the effects of blast vibrations through soils upon fresh and maturing concrete, which he

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In the present work, an attempt is made to study the effectiveness of the New-Zealand (N-Z) type base isolator (BI) in mitigating structural vibration effects due to blast induced ground motion (BIGM). The BIGM is modeled by an exponentially decaying function representative of a typical rock blast, and the isolator by a bilinear model.

Indirect Force Effects Vibration-induced Movement. One of the most important vibration effects to be aware of is simply the by-product of the movement it can cause. Vibration may originate from a variety of sources; two of the more important ones are earthquakes and vibration during transport.

Blast-Induced Damage Assessments of LNG Storage Facilities Rocket Launch-Induced Vibrations on Building; Shock Isolation in High-Rise Buildings; "Structural Analysis," Ch. 8, in "Report for the Design of Concrete Structures for Blast Effects," American Concrete Institute, July 2014. Tedesco, J. W. , and Krauthammer, T., "Structural

124 reinforced concrete slabs 4 by 5 by 0.5 ft. Data obtained from tests of the effect of portland cement concrete mix design, concrete cover over the reinforcing steel, and consolidation of the fresh plastic concrete are discussed in this paper. A brief description of slab fabrication and testing procedures is also presented.

the vibration of the elevated station induced by the train– track structure may cause negative structural effects. During the past several years, many forresearchers have analyzed the generation and propagation of train-induced vibrations in elevated rail systems. Kaynia et al. [1] outlined a test program to measure vibrations in the ground

Blast vibration is often expressed as a 'peak particle velocity', measured in millimetres per second. The vibration may be expressed in terms of the three orthogonal components (e.g. longitudinal, transverse and vertical), or the vector sum of these components. Key measures are defined in Appendix J of AS2187.2-2006. The magnitude of

Monitoring of blast-induced vibration effects on structures by fiber Bragg grating ; 3D hydrocode analyses of a mechanically stabilized earth retaining wall subjected to production blast vibrations at a surface coal mine ; Blast vibration study to analyse the response of a wind tower close to an open pit mine ; 7 Environmental