Mechanical Properties of Recycled Concrete in Marine Environment

Wang, Jianxiu; Huang, Tianrong; Liu, Xiaotian; Wu, Pengcheng; Guo, Zhenbang

doi:10.1155/2013/728357

Cited by 9 publications

(4 citation statements)

References 10 publications

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“…This can be further visualized from the results presented in table 1 below. This could have been attributed to the lower elastic modulus of the RAC and the internal bonding being destroyed by chloride ion ingress [46]. Additionally, it can be seen that there is a reduction in ′ with NAC which presents durability issues to be further investigated.…”

Section: Durability Properties Of Racmentioning

confidence: 99%

A Review of Recycled Concrete Aggregates as a Sustainable Construction Material

Rampit¹,

Smith²,

Ray³

2020

Proceedings of the International Conference on Emerging Trends in Engineering &Amp; Technology (IConETech-2020)

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The recent increase in structural developments worldwide, has given rise to the consumption of natural aggregates and energy hence generating a vast amount of construction and demolition waste. Natural aggregates occupy 60-75 percent in volume of the concrete matrix. It is beneficial to recycle construction and demolition waste, for construction activities. One such material retained from construction sites is waste concrete, which can be used to produce recycled concrete aggregates (RCAs). Recycling waste concrete produces a substitute to natural aggregates and preserves the environment by reducing waste disposal at landfills and conserving energy. The use of recycled concrete aggregates has piqued the interest of many researchers by utilization of a full or partial substitution to that of natural aggregates in concrete mixtures. Over the last decade, a significant volume of literature has been published discussing the properties and microstructure of recycled concrete aggregates and its response when used in a new concrete mix. Within this paper a brief history of RCAs is outlined together with statistics on the quantity of concrete waste produced, recycled and its practical applications. A comparison between the RCA and natural aggregate properties are discussed on a microscopic level, such as the density and water absorption capacities. Further to this, a summary of the mechanical and durability parameters are discussed such as compressive, tensile and flexural strengths together with chloride ion penetration. Several pre-treatment methods such as: acid treatment and the use of fine mineral fillers are also discussed. Finally, the conclusions and gaps are stated.

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Section: Durability Properties Of Racmentioning

confidence: 99%

A Review of Recycled Concrete Aggregates as a Sustainable Construction Material

Rampit¹,

Smith²,

Ray³

2020

Proceedings of the International Conference on Emerging Trends in Engineering &Amp; Technology (IConETech-2020)

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show abstract

“…The behavior of recycled cementing materials was investigated by a large number of researchers [7][8][9][10][11][12][13]. However, the long-term durability of recycled cementing materials, especially under various harsh environments, for example, in maritime environments, was reported to be obviously lower than conventional concrete [14]. Therefore, developing novel and sustainable cementing materials is still a scientific challenge for the sustainability of marine development.…”

Section: Introductionmentioning

confidence: 99%

Study on Physical and Mechanical Properties of High-Water Material Made by Seawater

Liu

Guo

et al. 2023

Sustainability

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In maritime engineering, marine-derived construction materials are seen as an efficient and cost-effective alternative. HWM is a novel inorganic cementitious material characterized by its high water content, rapid setting, and early strengthening. In this study, first, HWM was proposed to be produced from seawater and used in a maritime environment. Two groups of HWM samples with varied w/c ratios were prepared with fresh water and seawater, and their behavior was examined to assess the viability of HWM produced with seawater. The microstructures and chemical compositions were studied using SEM and XRD. Results indicated that as the w/c ratio increased from 3:1 to 6:1, the water content, density, and uniaxial compressive strength of HWM produced from seawater varied from 72.1% to 77.5%; 1.25 to 1.12 g/cm3, and 1.47 MPa to 0.39 MPa, respectively, which is 2–10% lower, 0.8–2.2% higher, and 13–45% stronger than that from fresh water. The chemical composition of HWM mixed with seawater is predominantly composed of ettringite, C-S-H gel, aluminum (Al(OH)3) glue, M-S-H gel, and Mg(OH)2. SO42− and Mg2+ in seawater participate in the hydration and hardening of HWM, resulting in an increase in the synthesis of ettringite and M-S-H gel, which makes the skeletal structure of HWM denser, hence increasing its strength. HWM derived from seawater retains excellent physical and mechanical properties. This work reveals the HWM-seawater interaction mechanism, elucidates the promising application prospect of HWM in maritime engineering, and paves the way to investigate its field performance.

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“…Coarse aggregate which is a major component of concrete occupies about 70-75% either of the concrete mass or volume. As a result of the depletion of natural sources of coarse aggregates and lack of synthetic aggregates, several research initiatives have, in recent times, been dedicated to sustainable aggregate use [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Strength Characteristics of Hand-Quarried Partially-Weathered Quartzite Aggregates in Concrete

Adom-Asamoah¹

2014

AJCE

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Abstract:The use of hand-quarried weathered quartzitic aggregates as the coarse component of concrete was investigated.Samples of hand-quarried quartzite aggregates exhibiting different degrees of weathering were evaluated in quality and their suitability as coarse component of concrete. The 7, 14, 28 and 56 day compressive strengths were obtained from 100mm concrete cube samples prepared with the weathered aggregates in 1:1:2, 1:1.5:3, 1:2:4 and 1:3:6 concrete mixes and different water: cement ratios 0.45, 0.5 and 0.6. Modulus of rupture beams were tested aged 28-days. Control samples were also tested for compressive and tensile strengths using sound granite aggregates obtained from a commercial quarry. The quality tests showed very little difference between the un-weathered quartzite aggregates and the sound granite aggregates. The weathered quartzite aggregates except the highly weathered grade were found to have properties that met specification requirements for concrete. However, the partially weathered aggregates were marginal in quality and had high water absorption values. The 28-day compressive strength of the partially weathered quartzite concrete averaged 86% of the granite. It is concluded that except when the degree of weathering is very high, the partially weathered quartzite stone could be used as coarse aggregates in concrete that would be subjected to low stresses.

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Mechanical Properties of Recycled Concrete in Marine Environment

Cited by 9 publications

References 10 publications

A Review of Recycled Concrete Aggregates as a Sustainable Construction Material

A Review of Recycled Concrete Aggregates as a Sustainable Construction Material

Study on Physical and Mechanical Properties of High-Water Material Made by Seawater

Strength Characteristics of Hand-Quarried Partially-Weathered Quartzite Aggregates in Concrete

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