Behaviour of concrete affected by sea-water under high pressure

Wegen, G. van der; Bijen, J.M.J.M.; Selst, R. van

doi:10.1007/bf02472865

Cited by 27 publications

(13 citation statements)

References 5 publications

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“…A similar effect upon the water permeability coefficient was observed with the addition of the superplasticiser in reference specimen R 1 , and likewise reflects a more discontinuous pore network within the material resulting from better compaction from enhanced fluidity of the mix in its plastic state. Additionally, the effects of swelling of the C-S-H under the hydrostatic pressure [ 51 ] could have contributed to a relative reduction in the permeability of the paste concomitant with the more discontinuous pore network. However, unlike R 1 , the addition of superplasticiser dispersed CNTs in specimens C 05 , C 10 , and C 25 showed a marked lower resistance to water permeation, largely counteracting the effects observed in R 1 with the addition of the superplasticiser alone, and the trend was similar to results observed for secondary water absorption in Section 3.1 .…”

Section: Resultsmentioning

confidence: 99%

Durability Characterisation of Portland Cement–Carbon Nanotube Nanocomposites

2020

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Multiwalled carbon nanotubes have outstanding mechanical properties that, when combined with Portland cement, can provide cementitious composites that could lead to the innovative construction of stronger, lighter, and thinner built infrastructure. This paper addresses a knowledge gap that relates to the durability of CNT–cement composites. The durability to corrosive chloride, uptake of water by sorption, and flow of the permeability of water acting under high water pressure are addressed. Flow simulations were undertaken through segmented 3D pore networks, based on X-ray computed microtomography measurements, the creation of a virtual microstructure, and fluid simulations that were compared with larger-scale samples. The investigation showed decreased water sorptivity of CNT–cement mixtures, indicating improved durability for the cover zone of concrete that is prone to the uptake of water and water-borne corrosives. Chloride diffusion of CNT–cement composites provided up to 63% improvement compared with control samples. The favourable durability bodes well for the construction of long-life CNT-reinforced concrete infrastructure.

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Section: Resultsmentioning

confidence: 99%

Durability Characterisation of Portland Cement–Carbon Nanotube Nanocomposites

2020

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“…Several research works have been devoted to investigating the influence of water pressure on concrete characteristics, such as compressive strength, peak strain, elastic modulus, and failure mode [ 23 , 27 , 28 , 29 , 30 , 31 ]. Most studies have been concerned with sensitivity to saturation conditions and the loading strain rate.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Effect of Repeated High Water Pressure on the Compressive and Bond Strength of Concrete with/without Steel Bar

2021

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The application of reinforced concrete for permanent and temporary deep ocean structures has recently become more prevalent; however, the static and dynamic effects of high water pressure on concrete remain unexplored. This paper investigates the influence of high water pressure (60 MPa) on four series of concrete cylinders with and without an embedded steel bar under sustained and cyclic loading conditions. The residual compressive strength, bond strength, and associated evolution of surface and internal damage are evaluated after exposing concrete cylinders to a water pressure of 60 MPa. The first series is exposed to sustained water pressure for 7 and 60 days, while the other series is tested under repeated water pressure for 10, 20, 30, 60, and 150 cycles. The results reveal that residual compressive strength falls immediately by 16% within 7 days of sustained high water pressure, but the strength then remains stable up to 60 days. Under repeated high water pressure, residual compressive strength gradually reduces by up to 40% until 60 cycles, after which it remains reasonably stable until 150 cycles as crack propagation is arrested at a certain depth within the concrete cylinders. The bond strength between the steel bar and matrix is observed to decrease considerably under repeated cycles of 60 MPa water pressure up to 26%. The damage gradually propagates at the matrix/steel bar interface under the repeated water pressure, resulting in a reduction in residual pullout capacity.

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“…Davis et al [ 14 ] found that the elastic modulus of saturated concrete was 12–30% higher than that of dry concrete. Johnston and Cook [ 15 , 16 ] found that elastic modulus was reduced by 32%, when the relative humidity of concrete was reduced from 100% to 30%. Yaman et al [ 17 , 18 ] found that the Poisson’s ratio and elastic modulus of saturated concrete were higher than those of dry concrete under the same porosity.…”

Section: Introductionmentioning

confidence: 99%

Influence of Humidity on the Elastic Modulus and Axis Compressive Strength of Concrete in a Water Environment

Zhang

Wei

et al. 2020

Materials

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Concrete structures are often in different humidity conditions that have a significant impact on the elastic modulus of concrete, therefore, systematic research on the evolution of the law of concrete elastic modulus under different humidity conditions is needed. In this study, the variation laws of the water saturation of concrete specimens with strength grades C15, C20, and C30 were obtained, and then the influence laws of the water saturation on the concrete axial compressive strength were carried out, and the prediction model of elastic modulus of concrete with respect to water saturation was constructed. The results showed that the water saturation of concrete with strength grades C15, C20, and C30 increased with an extension of immersion time, and the water saturation showed an approximately linear rapid growth within three soaking hours, reaching 47.56%, 71.63%, and 47.29%, respectively. Note, the concrete reached saturation state when the soaking time was 240 h. The axial compressive strength with strength grades C15, C20, and C30 decreased with increased water saturation, and the axial compressive strength of saturated concrete decreased by 27.25%, 21.14%, and 20.76%, respectively, as compared with the dry state concrete. The elastic modulus of concrete with strength grades C15, C20, and C30 increased with increased water saturation, and the elastic modulus of saturated concrete was 1.18, 1.19, and 1.24 times higher than those of dry concrete, respectively.

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Behaviour of concrete affected by sea-water under high pressure

Cited by 27 publications

References 5 publications

Durability Characterisation of Portland Cement–Carbon Nanotube Nanocomposites

Durability Characterisation of Portland Cement–Carbon Nanotube Nanocomposites

Investigating the Effect of Repeated High Water Pressure on the Compressive and Bond Strength of Concrete with/without Steel Bar

Influence of Humidity on the Elastic Modulus and Axis Compressive Strength of Concrete in a Water Environment

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