خواص الركام المعاد تصنيعه من الخرسانة

Ahmad J.  Ibrahim

doi:10.54172/mjsc.v25i1.782

Authors

Ahmad J. Ibrahim Civil Engineering Department, College of Engineering,Omar AL- Mukhtar University,El- Beida-Libya

DOI:

https://doi.org/10.54172/mjsc.v25i1.782

Abstract

Five grades of concrete mixes where designed and produced with natural aggregate. After tested at the age of 28 days, these concretes in the form of cast cubes, prisms and cylinders where crushed and screened to produce recycled concrete aggregates with similar grading of original one, then the physical and mechanical properties of coarse and fine recycled aggregate have been studied comparing with natural original aggregate. Tests on the aggregates showed, that recycled concrete aggregate gave lower specific gravity and higher water absorption capacity than the original aggregate. The resistance to mechanical action such as impact, crushing, and abrasion for the coarse recycled aggregate is also lower. The properties of recycled aggregate are not significantly affected by the mechanical properties of the original concrete.

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References

ACI Committee 555R, 2001: "Removal and Reuse of Hardened Concrete", 26 pp.

ACI Committee 211-1-1991, 1994:" Standard practice for selecting proportion for normal, heavyweight, and mass concrete", ACI Manual of concrete practice. American Society for Testing Materials; ASTM C 29-97: Test for Unit Weight in and Voids in Aggregates. ASTM C 33-99: Specification for Concrete Aggregates.

ASTM C 78-94: Test for Flexural Strength of Concrete (Using Simple Beam with Third – Point Loading).

ASTM C 127-93: Test for Specific Gravity and Absorption of Coarse Aggregate.

ASTM C 128-97: Test for Specific Gravity and Absorption of Fine Aggregate.

ASTM C 131-96: Test for Resistance to Degradation of Small Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine.

ASTM C 136-96: Standard Method for Sieve Analysis of Fine and Coarse Aggregates.

ASTM C 138-2000: Test for Unit Weight, Yield and Air Content (Gravimetric) of Concrete.

ASTM C 143-98: Test for Slump of Portland cement Concrete.

ASTM C 150-99 : Specification for Portland cement.

ASTM C 192-98: Making and Curing Concrete Test Specimens in theLaboratory.

ASTM C 496-96: Test for Splitting Tensile Strength of Cylindrical Concrete Specimens.

BCSJ , 1978:"Study on recycled aggregate and recycled aggregate", Building Contractors Society of Japan , Committee on disposal and reuse of concrete construction waste , summary in Concrete Journal , Japan ,Vol. 16, pp.18-31. DOI: https://doi.org/10.3151/coj1975.16.7_18

British Standard Institution;BS 812-110;1990: Methods for determination of aggregate impact value.

BS 812-112;1990: Methods for determination of aggregate crushing value.

BS 882-1990: Aggregate from Natural Source for Concrete.

BS 1881-116;1983: Methods for determination of Test of compressive Strength of Concrete Cubes.

Buck, A.D., 1973:"Recycled concrete", High way Research Record No. 430 High. Way Research Board, pp.1-8.

Buck A. D., 1977: "Recycled concrete as a source of aggregate", ACI Journal, pp.212-219.

Frondistou -Yannas S., 1977: "Waste concrete as aggregate for new concrete", ACI Journal, pp.373-376.

Hansen T.C., 1986:"Recycled aggregate and recycled aggregate concrete",Second state-of-the-art report RILEM TC-37-DRC. Materials and Structures (RILEM), Vol. 19, No.111, pp.201-204. DOI: https://doi.org/10.1007/BF02472036

Hansen T.C., and Narud H., 1983: "Strength of Recycled Concrete Made from Crushed Concrete Coarse Aggregate ", Concrete International-Design and Construction (ACI), Vol. 5, No.1, pp.79-83.

Hasaba S. Kawamura M., Toriik K. and Takemoto K., 1981: "Drying, shrinkage and durability of the concrete made of recycled concrete aggregate", Trans. Of the Japan Concrete Institute, Vol. 1.3, pp.55-60.

E.R.L., 1979 "Demolition waste-an examination of the arisings, end-uses and disposal of demolition wastes in Europe and the potential for further recovery of material from these wastes " , report prepared for the commission of the European Communities, DG-12. Environmental resources limited, London, the Construction Press, Lancaster,London,1980.

Iraqi quality standard, 1984: IQS-5-1984, Specification for Portland cement.

Neville, A.M., 1995:" Properties of concrete", Longman, Essex.

Nixon, P. J., 1978:" Recycled concrete as an aggregate for concrete-a review", First state-of-the-art report RILEM TC-37-DRC, Materials and Structures (RILEM), No. 65, pp.371-378.

Popovics, S. 1979: "Concrete making materials": McGraw-Hill, New York.

Rasheeduzzafar, and Khan A., 1984: "Recycled concrete-a source of new aggregate", Cement, Concrete and Aggregates (ASTM), Vol. 6, No.1, pp.17-27. DOI: https://doi.org/10.1520/CCA10349J

Ravindrarajah, R.S. , and Tam, T.C.,1985:"Properties of Concrete Made with Crushed Concrete as Coarse Aggregate", Magazine of Concrete Research, Vol.37,No.130, March,pp.29-38. DOI: https://doi.org/10.1680/macr.1985.37.130.29

Wilson, D.G., Foley, P., Wiesman, R., and Frondistou-Yannas,S.1976: "Demolition debris : quantities , composition and possibilities for recycling" Proceeding , 5th mineral waste utilization symposium, Chicago , ALESHIN E. Ed. , U.S bureau of mines ,Chicago , Illinois .