deliberate deformation of concrete after casting

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(PDF) Deliberate deformation of concrete after casting

2021-8-6  Deliberate deformation of concrete after casting. ... Since from traditional concrete research little experimental data on deformation after casting appeared to be available, experiments were ...

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Deliberate deformation of concrete after casting

Deliberate deformation of concrete after casting S Grünewald 1 , B Janssen 2 , H R Schipper 1 , K J Vollers 3 , J C Walraven 1 1 Delft University of Technology, Faculty of Civil Engineering and ...

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Deliberate deformation of concrete after casting ...

This paper discusses the effect of intentional deformation of a flexible formwork after casting of the concrete and the influence of the characteristics of concrete in the fresh state on the quality of a concrete element. This deformation is intended to bring the concrete element in its desired final shape; the deformation typically takes place in the first hour after casting.

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Deliberate deformation of concrete after casting - CORE

This paper discusses the effect of intentional deformation of a flexible formwork after casting of the concrete and the influence of the characteristics of concrete in the fresh state on the quality of a concrete element. This deformation is intended to bring the concrete element in its desired final shape; the deformation typically takes place ...

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ASSESSMENT OF CONCRETE CHARACTERISTICS DURING

ASSESSMENT OF CONCRETE CHARACTERISTICS DURING THE DELIBERATE DEFORMATION OF A FLEXIBLE MOULD AFTER CASTING Roel Schipper1, Steffen Grünewald1,2, Sergiu Troian3, Raghunath Prashanth4, Erik Schlangen5 and Oguzhan Çopuroğlu5 1 Delft University of Technology, Department of Structural and Building Engineering, Stevinweg 1, 2628 CN

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Assessment of concrete characteristics during the ...

Assessment of concrete characteristics during the deliberate deformation of a flexible mould after casting. Roel Schipper, Steffen ... The measurements show that thixotropic behaviour of concrete for this manufacturing method is very helpful, since it leads to a quick increase of the yield strength of the fresh concrete, but still leaves ...

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Deliberate Deformation of Concrete in the Fresh State ...

2017-8-6  The present paper describes the outcomes of a study focussing on two aspects relevant for the abovementioned production method: effect of change of rheological properties in the first 90 min after casting and assessment of the risk of cracking and development of cracks during the deformation

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Assessment of concrete characteristics during the ...

Schipper, Roel, et al. “Assessment of Concrete Characteristics during the Deliberate Deformation of a Flexible Mould after Casting.” Proceedings of the 1st Int. Conference CoMS_2017, Construction Materials For Sustainable Future, edited by I.B. Pecur, 2017, pp. 255–61.

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Rheological parameters used for deliberate deformation of ...

Rheological parameters used for deliberate deformation of a flexible mould after casting. Author. Grunewald, S. Schipper, H.R. Raghunath, P. Faculty. Civil Engineering and Geosciences. Department. Structural Engineering. Date. 2013-12-31. Abstract. This paper describes how curved precast concrete elements can be manufactured in an open and ...

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Rheological parameters used for deliberate deformation of ...

Rheological parameters used for deliberate deformation of a flexible mould after casting . ... This paper describes how curved precast concrete elements can be manufactured in an open and reusable flexible mould. The proposed method reduces formwork costs of architectural freeform elements in concrete. ... the right moment of deformation con be ...

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Deliberate deformation of concrete after casting - CORE

This paper discusses the effect of intentional deformation of a flexible formwork after casting of the concrete and the influence of the characteristics of concrete in the fresh state on the quality of a concrete element. This deformation is intended to bring the concrete element in its desired final shape; the deformation typically takes place ...

Get Price

Rheological parameters used for deliberate deformation of ...

Rheological parameters used for deliberate deformation of a flexible mould after casting. Author. Grunewald, S. Schipper, H.R. Raghunath, P. Faculty. Civil Engineering and Geosciences. Department. Structural Engineering. Date. 2013-12-31. Abstract. This paper describes how curved precast concrete elements can be manufactured in an open and ...

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Deliberate Deformation of Concrete in the Fresh State ...

Deliberate Deformation of Concrete in the Fresh State: Crack Risk and Efficient Production of Curved Precast Elements. S Troian, Steffen Grunewald, Erik Schlangen, ... effect of change of rheological properties in the first 90 min after casting and assessment of the risk of cracking and development of cracks during the deformation process. In ...

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Joost WALRAVEN Professor Emeritus Delft University of ...

The Netherlands has a large number of thin, transversely prestressed concrete bridge decks, cast in-situ between flanges of prestressed concrete girders dating back to the 1960s and 1970s.

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Figure 1. The flexible mould production process for

RHEOLOGICAL PARAMETERS USED FOR DELIBERATE DEFORMATION OF A FLEXIBLE MOULD AFTER CASTING Roel Schipper'", Steffen Grünewaid' and Prashanth Raghunath' ' Faculty of Civil Engineering and GeoSciences, TU Deift, THE NETHERtANDS. *: corresponding author, h.r.schippertatudeift.ni ABSTRACT This paper describes how curved precast concrete elements can ...

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Defects in Concrete Structures - Types Causes, Prevention ...

🕑 Reading time: 1 minuteDifferent types of defects in concrete structures can be cracking, crazing, blistering, delamination, dusting, curling, efflorescence, scaling and spalling. These defects can be due to various reasons or causes. Contents:Causes for Defects in Concrete StructuresStructural Defects due to Design and Detailing Structural Deficiency due to Construction Defects Other ...

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Assessment of concrete characteristics during the ...

Assessment of concrete characteristics during the deliberate deformation of a flexible mould after casting . By ... The change of the rheological behaviour of concrete in the period between mixing and deformation of the mould was assessed; an additional study was executed in order to assess the integrity of the concrete after the deformation of ...

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Going to Pieces: Investigating the Deliberate Destruction ...

Sustained chiselling at the casting flaw caused an indentation and plastic deformation, but did not cause breakage. This method was therefore altered so the spearhead was struck directly with the hammer, which caused bending and eventual breakage of the tip,

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Tensile response of Ultra High Performance PE Fiber ...

2021-5-6  PE-UHPFRC is a new Ultra High-Performance Fiber Reinforced Concrete (UHPFRC), which is developed to reduce the environmental impact of conventional UHPFRC by replacing the steel fibers with synthetic ones and reducing the clinker content in the mix. The development of the dynamic elastic modulus, the evolution of free autogenous deformations and the eigenstresses development with age,

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Effect of Reinforcement on Early-Age Concrete

2015-7-14  The tensile strength of concrete is relatively low and mass concrete structures after casting are prone to crack at early-age. Concrete deformation caused by cement hydration, if restrained, can result in tensile stress during the cooling phase. These tensile stresses will cause concrete cracking when exceeding the tensile strength.

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Assessment of concrete characteristics during the ...

Assessment of concrete characteristics during the deliberate deformation of a flexible mould after casting By Roel Schipper, Steffen Grünewald, Sergiu Troian, Prashanth Raghunath, Erik Schlangen and Oguzhan Çopuroğlu

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Assessment of concrete characteristics during the ...

Assessment of concrete characteristics during the deliberate deformation of a flexible mould after casting . By ... The change of the rheological behaviour of concrete in the period between mixing and deformation of the mould was assessed; an additional study was executed in order to assess the integrity of the concrete after the deformation of ...

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Metal casting processes - IIT Guwahati

2016-2-29  sand casting processes are a limitation to this technique. • Many new casting processes have been developed which can take into consideration the aspects of dimensional accuracy and surface finish. Some of these processes are die casting process, investment casting process, vacuum-sealed moulding process, and shell moulding process.

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Three-dimensional simulations of ageing concrete ...

2019-7-31  The durability of concrete structures is in no small degree determined by the quality and integrity of the concrete, where structural damages such as cracks negatively affect many of the functions of the structure. Often cracks are formed due to restrained thermal and hygral deformations, where the risk is exceptionally high during the early stages after casting

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Deformation Characteristics of Ultrahigh-Strength

2017-7-5  As structures like skyscrapers and long-span bridges become larger, the demand for higher strength of concrete is increasing. However, research on ultrahigh-strength concrete (UHSC) is still in its infancy. In particular, UHSC is known to have a considerably higher level of autogenous shrinkage than normal strength concrete (NSC), and the possibility of cracking at an early age is very high.

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Ballistic perforation resistance of thin concrete slabs ...

The slabs were demoulded the day after casting, wrapped in wet burlap, covered with plastic sheets and stored at room temperature to provide good curing conditions until the day of testing. The wooden moulds used to cast the concrete slabs and a typical slab with dimensions are shown in Fig. 1. In addition to the concrete slabs, cubes and ...

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Reduction of Postfire Properties of High-Strength Concrete

2013-3-24  The concrete specimens prepared were cylinders with dimensions of ϕ 75/225 mm. All specimens were demoulded 1 day after casting and were kept at a temperature of °C and a relative humidity of 95% in a curing room for 6 days. Subsequently, the specimens were moved to an air temperature of °C and relative humidity of 50% until testing. The testing programme was initiated

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Autogenous shrinkage of high performance concrete ...

2014-6-30  1. Introduction. In recent years, as a typical structural material, high performance concrete (HPC) is widely used in civil engineering because of its excellent performance, namely high workability, high strength, high durability and long-term performance , , .For the purpose of improving performance of concrete, lower and lower w/b are executed , , and a series of mineral and chemical ...

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Going to Pieces: Investigating the Deliberate Destruction ...

understanding plastic deformation and use-wear of Bronze Age metalwork (Sáez Lerma 2015; Horn von Holstein 2017) and have been raised elsewhere as a factor in understanding deliberate destruction (Knight 2019). The microstructure of bronze also means that it

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Composite Strain Hardening Properties of High

2014-7-13  Hybrid fibres addition in concrete proved to be a promising method to improve the composite mechanical properties of the cementitious system. Fibre combinations involving different fibre lengths and moduli were added in high strength slag based concrete to evaluate the strain hardening properties. Influence of hybrid fibres consisting of steel and polypropylene fibres added in slag based ...

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