Effect of Recycled Aggregate on Interlocking Concrete Blocks for Paving Aircraft Parking Areas in Iraq
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International Journal of Engineering Trends and Technology (IJETT) |  |
| © 2017 by IJETT Journal | ||
| Volume-54 Number-2 |
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| Year of Publication : 2017 | ||
| Authors : Suad Abdul-Aziz Sultan, Ban Sahib Abduljalel, Fadi Qais Abbas |
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| DOI : 10.14445/22315381/IJETT-V54P213 |
Citation
Suad Abdul-Aziz Sultan, Ban Sahib Abduljalel, Fadi Qais Abbas "Effect of Recycled Aggregate on Interlocking Concrete Blocks for Paving Aircraft Parking Areas in Iraq", International Journal of Engineering Trends and Technology (IJETT), V54(2),82-94 December 2017. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group
Abstract
This study aims to produce interlocking concrete blocks and base coarse by using recycled concrete aggregates which obtained from construction and demolition (C & D) wastes. As well as improving the subgrade layer using cement kiln dust (CKD) in order to construct pavement for aircraft parking area in Iraq. The work in this study includes laboratory tests to check the suitability of recycled concrete aggregate. Three concrete mixes have been prepared and tested (the first concrete mix without any additives or super plasticizers, the second concrete mix with 20 % cement kiln dust (CKD) as an addition to cement weight, and the third concrete mix with 20% cement kiln dust (CKD) as an addition to cement weight and super plasticizer (PC200)). Each concrete mix contains five groups with various proportions of RCA (0%, 25%, 50%, 75%, and 100%) in order to find best group that gives the higher compressive strength and to find the appropriate percentage of natural aggregate replacement to casting three different shapes of interlocking concrete blocks (rectangular, square and L shape). The subgrade layer for aircraft parking must be stiffened enough to withstand the static load of 230 KN. Therefore, the subgrade soil treated with 16% CKD as an additive to the weight of subgrade. The base course layer is prepared from conventional granular base material plus RCA material and stabilized by 3% and 5% cement. A laboratory simulation (box model) test has been carried out on interlocking concrete block pavement (ICBP) section to evaluate the ICBP performance by measuring deflection which has been used in back calculation program (BAKFAA) to find the elastic modulus of each layer. The results show that, RCA materials are suitable to use as aggregate materials in concrete mixes, the best concrete mix that is prepared with 20% of cement kiln dust (CKD) as an addition to cement weight and super plasticizers (PC200) which gives a compressive strength more than (40 MPa). The appropriate replacement percentages of NA by RCA are (25% and 50%). By means of elastic modulus, the best shape of concrete blocks is rectangular shape laying in 45°herringbone pattern.
Reference
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Keywords
Concrete blocks, Recycled concrete aggregate, Deflection and Back calculation