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precast concrete slabs an investigation by echo echo

precast concrete slabs an investigation by echo echo

PRECAST CONCRETE SLABS – An investigation by Echo - Echo

Apr 18, 2016  The Concrete Manufacturers Association (CMA), of which Echo is a member, has published the audited findings of a panel of independent professionals compared the costs of precast concrete versus in-situ concrete in the construction of two large residential complexes in Johannesburg and Pretoria. Pre-cast Concrete Slabs in Wall ConstructionIn ...

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Hollow Core Slabs Echo Precast

Hollow Core Slabs. slide 1 of 3. Hollow core slabs are floor and wall elements made from pre-stressed concrete with cores in the longitudinal axes. The cores reduce the weight of the floor element significantly in comparison with the solid slab elements. The panels can be manufactured loosely reinforced or pre-stressed.

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DAMAGE ASSESSMENT OF SEMI-PRECAST SLABS USING

successfully applied as a non-destructive evaluation of semi-precast slabs to localize regions of the defects between the layers. The results obviously confirmed the defects between the precast concrete layer and the cast-in-situ layer of the semi-precast slab. The impact-echo is simple to perform and gives

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Concrete Slabs - Echo

Apr 11, 2016  South African Hollow-core Extends its Footprint. MTN. Echo Slabs Used for Major Walling Projects in South Africa. Echo Prestress Celebrates 20 Years of Prestressed Slab Production. An invitation to ALL Architects.

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Echo Precast » pre-stressed concrete production plants

Tailor made pre-stressed concrete production plants. slide 1 of 1. Echo Precast Engineering, based in Houthalen, Belgium, develops and constructs machines and equipment for the production of pre-stressed concrete products. Over the years, we have gained an international reputation for our technical know-how and engineering services.

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Pre-stressed concrete elements Echo Precast

Pre-stressed concrete elements are finished parts, in which tensioned wires have been inserted. The stressing of the wires compresses the concrete. The tensioned bead wires allow compensation for subsequent loads, effects of temperature or traction forces, which may arise. Pre-stressed concrete elements can be manufactured using a variety of ...

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Half Slabs Echo Precast

The half slabs are a light prestressed concrete element for medium long spans. It shows high load resistances because of a concrete mix of 0.32 to 0.40 water/cement ratio. Half slabs possess excellent rigidity during loading, unloading, lifting, and installation. It is self-supporting in medium spans, so it requires a smaller number of risers ...

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Preservation Brief 15: Preservation of Historic Concrete

Impact echo testing is performed on a concrete structural slab to help determine depth of deterioration. In this method, a short pulse of energy is introduced into the structure and a transducer mounted on the impacted surface of the structure receives the reflected input waves or echoes.

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Echo Precast - Increased automation in production of ...

The MAS 1100 from Echo Precast provides Dennert with a higher degree of automation and a more efficient production of prestressed hollow-core slabs (Photo: Dennert). For the investment in a new multi-angle saw, Dennert opted for a MAS model from Echo Precast Engineering, Houthalen, one of the seven companies in the Progress Group, a leading ...

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UNITED STATES OF AMERICA NUCLEAR REGULATORY

Concrete Materials-Related Design, Investigation and Testing, and Repair x Support of precast high-strength lightweight concrete production, including mixture development, qualification, and troubleshooting, Pittsfield, MA. x Design of specialty topping and structural slabs in plazas, garages, warehouses, and commercial buildings, nationwide.

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Debonding Detection in the Grouted Joints of Precast ...

Jun 01, 2021  A detailed investigation into the typical impact-echo responses near the free and fixed boundaries of precast concrete shear walls has been conducted. Through a field study conducted on two precast concrete panel wall joints containing a perfect and a deficient grout layer, respectively, the effectiveness of the impact-echo method in detecting ...

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NON-DESTRUCTIVE EVALUATION OF THE CONCRETE FLOOR

Echo method verified the expanse of the delamination. REFERENCES 1. EN 13791:2008. Assessment of on in-situ compressive strength in structures and precast concrete components 2. Davis AG, Hertlein BH.: Nondestructive testing of concrete pavement slabs and floors with the transient dynamic response method. Proc Int Conf Struct Faults Repair ...

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Grouting Defect Detection of Lapped Bar Connections Based ...

Grouted lap-splice connections are widely used for connecting precast concrete components. Grouting defects in the connections significantly influence the structural performance of the whole connection, which leads to the need for grouting defect detection. In this study, the impact-echo (IE) method was used for detecting defects in grouted lap-splice connections.

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Cross-Sectional Modes in Impact-Echo Testing of Concrete ...

Impact-echo tests were performed on a precast, reinforced concrete bridge slab that was removed from a maintenance bridge built in 1953 in South Carolina. ... In the experimental investigation ...

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TopFloor Concrete, Hollow-core Precast Floors

topfloor hollow-core concrete floor panels have been an important contributor to the growth of the building and construction industry in the western cape since 1997 That role has been strengthened through the acquisition of Topfloor by the Echo Group, South Africa’s largest and longest-established prestressed and precast floor manufacturer.

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Structural Testing and Investigation Service - Infrastruct

Infrastruct provides a rapid, reliable and structure focused testing and investigation service using modern testing equipment and techniques. All our services are carried out to the latest European and British Standards where possible and the test results and related information are provided in a detailed report with interpretation and AutoCAD ...

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Echo Precast Engineering - Home Facebook

Echo Precast Engineering, Houthalen. 24 likes 4 talking about this. Echo Precast Engineering develops and constructs machines equipment for the production of precast concrete elements.

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Indian Concrete Journal

The two different concrete mixtures encountered at such slab-column joints pose a design and construction problem. Though the Indian code is silent on this aspect, ACI code was the first to suggest three different approaches. Of these, the third approach of designing the slab-column joint using an effective concrete strength, fce , is found to ...

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Non-Destructive Testing, Evaluation Services Archives ...

Jan 31, 2020  CA determined the extent of the deficiencies and developed a repair protocol for the wall. CA’s investigation of the wall included a visual survey, non-destructive testing (NDT) using ultrasonic echo 3D tomography, and concrete core sampling for

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Prestressed Floors - Echo

Prestressed Floors Basic Design Parameters No propping is required. Only a 40mm leveling screed is required over the slab. Echo Prestress may be specified with cantilevers by incorporating reinforcing into the hollow cores. which are grouted in the factory during the casting process.. Where Echo Prestress is used as roof slabs or balconies, a minimum Ref. 100 mesh is required in the insulating ...

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Nondestructive Evaluation (NDE) of Concrete with Impact ...

Impact-echo is an acoustic non-destructive test (NDT) method developed by Sansalone and Carino 1 in the 1980s for flaw detection in plate-like concrete structures, such as bridge decks, walls, and slabs. Internal flaws such as cracks, voids, honeycombing, and delamination can negatively impact the capacity and service life of concrete structures.

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UNITED STATES OF AMERICA NUCLEAR REGULATORY

Concrete Materials-Related Design, Investigation and Testing, and Repair x Support of precast high-strength lightweight concrete production, including mixture development, qualification, and troubleshooting, Pittsfield, MA. x Design of specialty topping and structural slabs in plazas, garages, warehouses, and commercial buildings, nationwide.

get price

Cross-Sectional Modes in Impact-Echo Testing of Concrete ...

Impact-echo tests were performed on a precast, reinforced concrete bridge slab that was removed from a maintenance bridge built in 1953 in South Carolina. ... In the experimental investigation ...

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Concrete Plant Precast Technology

Echo’s prestressed hollow-core slabs were specified by PDS Civil and Structural Engineers and slabs totaling +/- 3,100 m² were used for Phase 1. Phase 2 will make use of +/- 3,750 m² of Echo slabs. Slabs up to 10 m were deployed on the first-floor sections and slabs

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Teemage - Teemage Precast In

The Multi-Angle Sawing machine by Echo Precast enables the cutting of cured concrete slabs cast in 150m lengths to varying slabs with required lengths. The typical cutting angle is 90deg which can be adjusted to 0 deg for lengthwise cutting and any other degree for angular cutting.

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ECHO Precast Engineering- How to Boost a Hollow Core Plant

ECHO Precast Engineering offers the most dynamic battery powered machines such as the SmartJet automatic plotter, fresh concrete saw, multi-functional trolley, and transport wagon. The special FCS Saw cuts bars in fresh concrete and saves drastically on saw blades; it

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TopFloor Concrete, Hollow-core Precast Floors

topfloor hollow-core concrete floor panels have been an important contributor to the growth of the building and construction industry in the western cape since 1997 That role has been strengthened through the acquisition of Topfloor by the Echo Group, South Africa’s largest and longest-established prestressed and precast floor manufacturer.

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Do you want to know step by... - Echo Precast Engineering ...

GJ industries nv normally produces with Slipformers but has now cho... sen to expand its range of machines with the Extruder X-Liner from Echo Precast Engineering and, by this way, to increase the production of the 60 cm wide slabs. These X-Liner modules can produce two slabs at the same time with the height of 160- and 180-mm. The unique combination of screws and a center mold piece (to ...

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(PDF) Lamb Wave Basis for Impact-Echo Method Analysis

The impact-echo method has been developed over the past 20 years and is now widely used in the nondestructive evaluation of concrete. However, some practical issues remain unresolved, such as the ...

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Precast Issue 1 2016 by Isikhova Media - Issuu

Apr 29, 2016  An investigation is also. ... 541:2012 precast concrete slabs was. ... Echo Prestress Durban’s prestressed slabs were integral to the fast-track and interference-free extension of Stanger ...

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Damage assessment of hollow core reinforced and ...

Jan 01, 2017  References [1] E. Baran, Effects of cast-in-place concrete topping on flexural response of precast concrete hollow-core slabs, Engineering Structures 98 (2015) 109-117. [2] A.M.Shakya, V.K.R. Kodur, Response of precast prestressed concrete hollow core slabs under fire conditions, Engineering Structures 85 (2015) 126-138. [3] A.

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ATLSS Reports Lehigh Preserve

Nondestructive Evaluation of Concrete Strength in the Precast Plant Using the Impact-Echo Method Report Number 04-10 Creator Irwin, Daniel, Pessiki, Stephen P. Department Civil and Environmental Engineering Date Issued 2004-04-26

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Construction Materials Concrete Durability Archives ...

Jan 31, 2020  CA determined the extent of the deficiencies and developed a repair protocol for the wall. CA’s investigation of the wall included a visual survey, non-destructive testing (NDT) using ultrasonic echo 3D tomography, and concrete core sampling for

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New player opens production site for hollow core slabs in ...

To set up their production of hollow core slabs and prestressed elements, Larco relied on machinery from Echo Precast Engineering, Houthalen, one of the seven companies belonging to the Progress Group, a leading full-range supplier to the precast industry. Echo delivered the full range of machinery and equipment: with a Slipformer S-Liner, a ...

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