UTILIZATION OF SOLID WASTES IN CEMENT BRICKS FOR
AN ENVIRONMENTAL BENEFICIAL
1. HOUSING AND BUILDING NATIONAL RESEARCH CENTER, GIZA, EGYPT
2-3. SUEZ UNIVERSITY, EGYPT
4. BENI-SUEF UNIVERSITY, EGYPT
ABSTRACT: The building materials industry generates secondary products or wastes, which have a direct effect on the environment. The storage of such wastes in dumps pollutes the air and contaminates water sources and agricultural fields. There is a tremendous scope for recycling and using such huge quantity of wastes to minimize their environmental impact. This paper investigates the effect of partial/full replacement of conventional aggregates with recycled aggregates in manufacturing of solid cement bricks. Three series of recycled aggregates were…show more content… The aim of this work is to study the effect of recycling some types of solid wastes generated from the quarrying, processing and industrial practices as coarse and fine aggregate in the production of solid cement bricks to reduce the impact that the environment can suffer from the consumption of natural aggregates and the random disposal of wastes.
EXPERIMENTAL PROCEDURE - Materials
The used cement was produced by El-Suez Cement Company designated as CEM I 42.5N. Sand and crushed stone with nominal maximum size of 10 mm were used as fine aggregate (FA) and coarse aggregate (CA), respectively. Three types of wastes; quarry waste, marble waste and crushed ceramic were used as recycled coarse and fine aggregates. Coarse quarry waste was that passed from sieve
4.76 mm and retained on sieve 2.38 mm, and fine quarry waste was that passed from sieve 2.38 mm.
Coarse marble waste was that passed from sieve 14 mm and retained on sieve 4.76 mm, and fine marble waste was that passed from sieve 4.76 mm. Coarse crushed ceramic was that passed from sieve
14 mm and retained on sieve 4.76 mm, and fine crushed ceramic was that passed from sieve 4.76…show more content… Finally, the third series (series III) includes crushed ceramic which was used to replace either coarse aggregate at 0%, 25%, 50%, 75% and
100%, fine aggregate at 0%, 25%, 50%, 75% and 100%, or replacing 25% coarse aggregate and 75% fine aggregate simultaneously. All mixtures were designed to have an almost zero slump to be compared on a common basis. Mixtures proportions are shown in Tables 2 to 4.
Table 1. Physical properties of aggregates 1
Coarse aggregate Fine aggregate
Property
CS QW MW CC CS QW MW CC Limits
Specific gravity (SSD) 2.70 2.86 2.72 2.20 2.5 2.63 2.50 2.17 -
Unit weight (t/m3) 1.67 1.46 1.51 1.24 1.62 1.80 1.51 1.44 -
Absorption (%) 1.53 1.60 0.30 3.40 - - - - ≤2.53
Fineness modulus 0.12 0.06 - - - ─
Clay and fine materials (%) - - 0.73 0 1.40 11.00 6.00 9.70 ≤ 4%2
Impact index (%) 14.60 - 25.00 13.40 - - - - ≤ 452
Flakiness index (%) 14.30 - 14.70 16.60 - - - - ≤ 253
Elongation index (%) 16.60 - 18.20 17.30 - - - - ≤ 253
Abrasion resistance (%) 18.40 - - 26.40 - - - - ≤ 302
(1) CS: Crushed stone, QW: Quarry waste, MW: Marble waste, CC: Crushed ceramic
(2) According to the Egyptian Standard Specifications No. 1109/2002 [12]
(3) According to Egyptian code of practice issued 2007