Time-dependent behaviour of high performance concrete: influence of coarse aggregate characteristics

Makani, Abdelkadir; Vidal, Thierry; Pons, Gérard; Escadeillas, Gilles

doi:10.1051/epjconf/20100603002

Cited by 12 publications

(10 citation statements)

References 9 publications

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“…Poon et al 62 stated that the compressive strength would be better when granite aggregate was used in place of recycled aggregate. Makani et al 63 reported that using limestone aggregate as coarse aggregate in place of granite or siliceous coarse aggregate would give better results. Echeta et al 64 reported that a mixture prepared with 80% washed gravel and 20% granite aggregate gave the highest increase in compressive strength (53.9%).…”

Section: Substitution Of Coarse Aggregates With Crushed Granitementioning

confidence: 99%

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Semi‐green cementitious materials from waste granite by considering the environmental, economic, and health impacts: A review

Arel

Shaikh

2018

Structural Concrete

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In this review, the studies conducted on the use of recycled waste granite (WG) in place of different components in concrete or cementitious materials, such as aggregate and cement were reviewed. In this regard; research was conducted on the reuse of WG to make economic benefit, to prevent accumulation of WG, to contribute to the environment by helping in the formation of new materials from waste material, and the use of WG, which would generate hazardous radioactive gas to human health, in concrete production. Thus, the cementitious materials that will be obtained shall be environment-friendly, economic, and helpful in the isolation of hazardous radioactive wastes. Therefore, within the scope of this study, it was investigated whether semi-green cementitious materials obtained from recycling WG would have the mechanical characteristics to satisfy the requirements, and have equivalent or even surpassing characteristics compared to materials made from classic materials. The results were obtained at a substitution rate of 5-7.5%; when recycled WG was used in place of aggregate, the results were obtained at a substitution rate of 15-25%; and when recycled WG was used in place of coarse aggregate, it gave better performance than recycled normal concrete aggregate and worse performance than crushed quartzite coarse aggregate. Furthermore, in terms of economy, it was determined that the utilization of WG would decrease costs by a minimum of 0.54% and a maximum of 2.1%; while with respect to CO 2 emissions, the use of WG could decrease worldwide CO 2 emission by 5%. Also, it was determined that the best solution for granite, which could cause gas emissions of hazardous gases such as radon gas, would be to be used in concrete that would be exposed to open air.

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Section: Substitution Of Coarse Aggregates With Crushed Granitementioning

confidence: 99%

“…Makani et al 63 The effect of coarse aggregate type on the mechanical properties of high-strength concrete (HPC)…”

Section: Compressive Strengthmentioning

confidence: 99%

Semi‐green cementitious materials from waste granite by considering the environmental, economic, and health impacts: A review

Arel

Shaikh

2018

Structural Concrete

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“…Again, longer periods of time are required for the application to bridges. The influence of the type of aggregate has also been studied in laboratory tests …”

Section: Literature Reviewmentioning

confidence: 99%

“…The influence of the type of aggregate has also been studied in laboratory tests. 9 In terms of the long-term behavior of high-strength prestressed concrete box girder bridges, limited information is available, none of which was available at the time of design of the Second Stichtse Bridge. In China, the long-term behavior of a segmental concrete cantilever T-beam of 12.8 m in length has been studied 10 to simulate the construction process of the Sutong Bridge.…”

Section: Literature Reviewmentioning

confidence: 99%

Long‐term material and structural behavior of high‐strength concrete cantilever bridge: Results of 20 years monitoring

Lantsoght

Veen

Boer³

et al. 2018

Structural Concrete

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In 1997, the Second Stichtse Bridge was built in the Netherlands using the balanced cantilever method. The use of high‐strength concrete was proposed. At that time, the long‐term behaviour of this material was not known, and no code provisions were applicable. Therefore, it was proposed to monitor the material behaviour and the deflections of the bridge. To evaluate the development of the concrete compressive strength and the concrete splitting tensile strength over time, concrete cubes were cast at the same time as each of the cantilever segments, and stored inside the bridge. These samples have been tested at different points in time to study the development of the strength as a function of the elapsed time. Creep and shrinkage measurements were carried out on samples stored inside the bridge as well as in the laboratory. Temperature and moisture were monitored as well. The deflections of the bridge superstructure have been measured periodically. These measurements can be compared to predictions from finite element models. Based on the available data, it is found that the concrete compressive and splitting tensile strength remain constant. The deflections are small, and the advanced finite element models resulted in good predictions.

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“…Elastik modulus konkrit juga dipengaruhi oleh bentuk dan tekstur agregat. Kajian oleh Makani et al (2010) telah mendapati bahawa konkrit campuran agregat berbentuk ellipsoid mempunyai elastik modulus yang lebih tinggi berbanding dengan agregat berbentuk bulat. Selain itu, zon peralihan antara muka (ITZ) berlaku pada konkrit juga berbeza semasa dibawa beban yang berlainan.…”

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Aggregate Impact on Dynamic Behavior of Concrete using Finite Element Method

Mutalib¹,

Yong²,

Hamzah³

2017

JKUKM

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Konkrit merupakan bahan komposit yang penting dan sering digunakan dalam sektor pembinaan kerana konkrit mempunyai sifat kekuatan mampatan yang tinggi. Agregat terdiri daripada 70% isi padu konkrit, maka sifat agregat dipercayai memberi kesan yang besar terhadap tingkap laku konkrit semasa struktur konkrit dikenakan beban dinamik yang kuat (contohnya letupan gas atau senjata, kejatuhan batu dan gempa bumi). Kelakuan konkrit di bawah beban dinamik boleh diketahui dengan mengenal pasti faktor peningkatan dinamik (DIF). Semasa konkrit di bawah tekanan statik yang rendah, corak keretakan konkrit berlaku pada zon peralihan antara muka (ITZ) tetapi jika konkrit di bawah tekanan yang tinggi, keretakan berlaku melalui agregat, maka ia akan meningkatkan kekuatan konkrit. Penyelidikan ini bermatlamat untuk mengkaji kesan agregat biasa ke atas kelakuan dinamik konkrit dengan menggunakan kaedah unsur terhingga yang menggunakan perisian LS-DYNA. Model konkrit yang berlainan agregat iaitu agregat granit, basalt, batu kapur, dan batu pasir telah digunakan dalam kajian ini. Simulasi berangka model konkrit di bawah mampatan pada kadar tekanan yang berbeza dijalankan. Pada kadar terikan yang rendah, kerosakan pada konkrit berlaku pada mortar sahaja dan tidak ketara. Manakala, pada terikan yang tinggi, kerosakan berlaku pada agregat dan juga mortar dan kerosakan adalah menonjol. Basalt mempunyai kekuatan yang tinggi mempunyai nilai DIF yang paling tinggi berbanding dengan agregat yang lain di mana batu kapur mencatatkan nilai DIF yang paling rendah. Kata kunci: Agregat; faktor peningkatan dinamik; kadar terikan ABSTRAK Concrete is a composite material that is important and is often used in construction because concrete has a high compressive strength. Aggregates consisting of 70% by volume of concrete, thus the aggregate properties is believed to affect the behavior of concrete during concrete structures subjected to dynamic loads strongly (e.g. gas explosions or weapons, falling rocks and earthquakes). The behavior of concrete under dynamic loads can be found by identifying the dynamic increase factor (DIF). When concrete under static and low-rate loading, concrete material damage is governed by the relatively weaker strength of mortar and the interface transition zone (ITZ), but if the concrete under high-speed loading, cracking propagate through aggregates, therefore results in increase the strength of concrete. This research aims to study the effects of normal aggregates on the dynamic behavior of concrete by using the finite element method using LS-DYNA software. Models of concrete with different types of aggregates such as granite, basalt, limestone, and sandstone are used in this study. Numerical simulation of model concrete under compressive stress at different strain rate is carried out. At low strain rate loading, concrete failure only occurred in the mortar and not too obvious. While, at high strain rate loading, failure occurred in the aggregate and failure in the mortar is apparent. Basalt that is high strength has hig...

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Time-dependent behaviour of high performance concrete: influence of coarse aggregate characteristics

Cited by 12 publications

References 9 publications

Semi‐green cementitious materials from waste granite by considering the environmental, economic, and health impacts: A review

Semi‐green cementitious materials from waste granite by considering the environmental, economic, and health impacts: A review

Long‐term material and structural behavior of high‐strength concrete cantilever bridge: Results of 20 years monitoring

Aggregate Impact on Dynamic Behavior of Concrete using Finite Element Method

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