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Istanbul UniversityCivil Engineering departmentHeavyweight Concrete(Ar Beton)Masaab Alsayed Ali1310110105

zel Betonlar

Do.Dr. zlem elik Sola

- INTRODUCTION- DEFNTON - COMPONENTS- PRODUCTION- PLACEMENT - PROPERTIES - USES- CONCLUSION

Introduction - Generally in civil engineering the extra weight is undesired .- Ensure the safety against sliding or overturning of the special structure ( Stability ).- Radiation shielding.

Definition- Heavyweight high density.- Density more than 2600 kg/ M3.- Resistance to extreme weather.- Heavyweight aggregate ( density more than 3000 kg/ M3 ) .

Components

Cement Water Heavyweight aggregate Admixtures

Cement -The same cement in normal concrete .- It is better to use low hydration heat cement .

Water - Low water to cement ratio .- Less air voids .

Heavyweight aggregate

1- density more than 3000 kg/ M3 .2- abrasion resistance .3- (70 90) % of the concretes weight .4- particle size less than 2.36 cm.

- Ilmenite , hematite, magnetite, goethite and limonite, Barite.

a) Natural Aggregate :

Ilmenite

hematite

magnetite

goethite

- Scrap iron, steel punching, iron shot and ball bearings.

b) Industrial Waste Aggregate :

- improve the placeability and reduce the tendency for segregation.- Air-entraining admixtures low density .- Fly ash is used to enhance the workability. - An air- detraining agent is often helpful.

Admixtures

- homogenous mixture well-graded aggregates.- Prior to use, the steel punching should be washed in alkaline solution, to remove all traces of oil and grease.- Typical cement content is of the order of 400 kg/m3, and with water-cement ratio of 0.4 .- To avoid segregation , low mixing time .

Production - In replacement the segregation is the most remarkable problem .- To avoid segregation we can use the prepacked method (Preplaced-aggregate method). - Should not be placed in layers of more than 30 cm thick .- More density more rigid framework.- Applying vibration to gain high density concrete .

Placement

Properties

- Gamma ray and X ray .- Electron high density .- high hydrogen content for shielding neutrons .- Concrete VS lead .- Nuclear power plants, particle accelerators, research reactors, laboratory hot cells and medical facilities.

Usesa) Radiation shield :

- Because of its weight it can be used as counterweights in the special structures that needs high weight blocks .

b) counterweights :

Lift Bridge

Bascule Bridge

Tower Crane - Tsunami resistance . - Special shapes. - Avoid displacement heavy weight .

c) Wave dissipating blocks:

- Heavyweight concrete always is used when we feel need to the extra weight in the structure . - We can get a concrete with density between ( 3000 kg/ M3 - 6000 kg/ M3 ) and that according to the heavyweight aggregate that is used in production .

- Different concrete mixes can have very differentattenuation characteristics, so the heavyweight concrete should be designed according to the purpose of its production .

Conclusion Turan zturan, ZEL BETONLAR , Boazii niversitesi , Istanbul.Ahmed S. Ouda , Development of high-performance heavy density concrete using different aggregates for gamma-ray shielding , Housing and Building National Research Center (HBRC), Dokki, Giza, Egypt, 2014 .emsettin KILINARSLAN , Celalettin BAYT, smail UZUN , air betonlarin slfat etkisinde mekanik zellikleri, SDU International Journal of Technologic Sciences,2010.James S. Pierce, Heavyweight Concrete Measuring, Mixing, Transporting, and Placing, Reported by ACI Committee 304.

References H. P. Sleeper, Jr. and C. E. Clifford, attenuation measurements in heavy aggregate m-1 concrete, OAK ridg national laboratory .Yung Kyu Lim,Shielding effectiveness of Magnetite heavy concrete on cobalt-60 gamma-rays, journal of the Korean nuclear society , 1971.. Klnarslan , S. Sancar, .Uzun, Barit Agregal Ar Betonlarn Betonarmede Kullanlabilirlii, 6th International Advanced Technologies Symposium (IATS11), 16-18 May 2011, Elaz, Turkey.

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S.M.J. Mortazavi, M.A. Mosleh-Shirazi, M. Baradaran-Ghahfarokhi, Z. Siavashpour, A. Farshadi, M. Ghafoori, A. Shahvar, Production of a datolite-based heavy concrete for shielding nuclear reactors and megavoltage radiotherapy rooms, Iran. J. Radiat. Res., 2010; M. Maslehuddin, A.A. Naqvi, M. Ibrahim, Z. Kalakada , Radiation shielding properties of concrete with electric arc furnace slag aggregates and steel shots, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia .

Tung-Chai Ling, Chi-Sun Poon, Wai-Shung Lam,Tai-Po Chan, Karl Ka-Lok Fung, X-ray radiation shielding properties of cement mortars prepared with different types of aggregates , The Hong Kong Polytechnic University, University of Birmingham.

Paul R. Stodola, Guide for the Use of Preplaced Aggregate Concrete for Structural and Mass Concrete Applications, Reported by ACI Committee 304, 1997 .

Cert. Elect. Eng., Dipl. Civ. Eng., BCE, MEngSc (Mechanical Engineering), PhD (Engineering Materials), FIE Aust., CP Eng,Use of Concrete as a Biological Shield from Ionising Radiation, the Australian Academy of Technological Sciences and Engineering.

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Minoru Hanzawa, Akira Matsumoto ,Hitoshi Tanaka , STABILITY OF WAVE-DISSIPATING CONCRETE BLOCKS OF DEACHED BREAKWATERS AGAINST TSUNAMI . THANKS FOR LISTENING