In Algeria, wastes are often stored in such conditions that do not meet standards. Today and more than ever, we really must implement an environmentally management of wastes. Recovery of waste in Algeria has a considerable delay due to the absence of a policy favorable to the development of waste management. But many researchers have shown the possibility to reuse dredged sediments in road construction. Through Europe, recent research works have been already performed on dam sediments. Present study fits into the context of the valorization of dredged sediments from Fergoug dam. They are found in considerable quantities and mainly composed of mineral phases, organic matters and water. The reservoir sedimentation poses problems for the environment and water storage, dredging becomes necessary. Civil engineering is a common way of recycling for such materials. Dredged sediments have not the required mechanical characteristics recommended by the standards as GTR guide (LCPC-SETRA 1992). So as to obtain mechanical performance, dredged sediment can be treated with cement, lime, or replaced materials like quarry sand. An experimental study has been conducted to determine physical and mechanical characteristics of sediments dredged from dam. Then different mixtures of sediment and/or quarry sand with hydraulic binders are proposed for improving the grain size distribution of the mixes. Finally, according these mixtures, different formulations have been tested as alternative materials with dredged sediments.
dredged sediment; dam sediment; valorization; road engineering; sediment characterization; mechanical behavior
Assia Benaissa, Zehour Aloui, Moulay S. Ghembaza and Yahia Sebaibi: Department of Civil Engineering, Fac.Technology, Labo. Civil Engineering & Environment (LGCE), Sidi Bel Abbes, Algeria
Daniel Levacher: Normandy University, Uni caen, Laboratoire M2C- UMR 6143 CNRS 24 rue des Tilleuls, 14000 Caen, France
The quantity of construction and demolition waste has been greatly increasing recently. It causes many problems to the environment. For this reason, demolition waste management becomes inevitable in order to overcome the environmental issues. The present study aims to evaluate the effects of using recycled coarse aggregate, which is generated from construction and demolition waste, on the properties of recycled aggregate concrete. An experimental investigation on the strength characteristics of concrete made with recycled coarse aggregate is presented and discussed in this paper. In this study, Portland Pozzolana Cement (fly ash based) is used instead of ordinary Portland cement. The results of this investigation show the possibility of the use of recycled coarse aggregates in the production of fresh concrete. Use of demolition waste as coarse aggregate will lead to a cleaner environment with a significant reduction of the consumption of natural resources. A comparative study on the strength characteristics of recycled aggregate concrete made with Ordinary Portland Cement and Portland Pozzolana Cement is presented and discussed in this paper.
recycled coarse aggregates; construction and demolition waste; Portland Pozzolana Cement; Concrete
Suman Saha and Rajasekaran C: Department of Civil Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore-575025, India
The objective of the present work is to evaluate the influence of two different methods of improving the ductility of Reinforced Concrete Frames and their influence on the full range behavior of the frames with M40 grade of concrete. For this purpose one fourth scale reinforced concrete square frames are experimentally tested subjected to static cyclic loading for three cases and monotonic loading for one case. The parameters are varied as method introducing ductility to the frame viz. (i) by using conventional concrete (ii) adding 1% of steel fibres by volume of concrete at hinging zones (iii) using self-compacting concrete with fibres at hinging zones. The energy absorption by ductile and non-ductile frames has been compared. The behavior of frames tested under cyclic loading have revealed that there is a positive trend in improvement of ductility of frames when fibrous concrete is used along with self-compacting concrete.
ductile frame; non-ductile frame; fibrous concrete; self-compacting concrete; monotonic and cyclic loading; energy absorption characteristics
K. Senthil: Department of Civil Engineering, National Institute of Technology Jalandhar, Punjab 144011, India
K.S. Satyanarayanan: Department of Civil Engineering, SRM University, Kattankulathur, Tamil Nadu 603203, India
S. Rupali: Department of Civil Engineering, Indian Institute of Technology Roorkee, Uttarakhand 247667, India
This work investigates the mechanical properties of conventional concrete (CC) and self compacting concrete (SCC) using fine rubber and silpozz were accompanied by a comparative study between conventional rubberized concrete (CRC) and self compacting rubberized concrete (SCRC). Fine rubber (FR) from scrap tires has replaced the fine aggregate (FA) and Silpozz has been used as a
replacement of cement at the proportions of 5, 10 and 15%. Silpozz as a partial replacement of cement in
addition of superplasticiser (SP) increases the strength of concrete. Fresh concrete properties such as slump
test, compaction factor test for CRC, whereas for SCRC slump flow, T500, V-funnel, L-box, U-box, J-ring
tests were conducted along with the hardened properties tests like compressive, split tensile and flexural
strength test at 7, 28 and 90 days of curing. The durability and microstructural behavior for both CRC and
SCRC were investigated. FR used in the present study is 4.75 mm passing with fineness modulus 4.74.M30
grade concrete is used with a mix proportion of 1:1.44:2.91 and w/c ratio as 0.43. The results indicate that as FR quantity increases, workability of both CRC and SCRC decreases. The results also show that the
replacement of natural fine aggregate (NFA) with FR particles decreases the compressive strength with the
increase of flexural strength observed upto 5% replacement of FR. Also replacement of cement with silpozz resulted enhancement of strength in SCRC.
conventional rubberized concrete (CRC); self compacting rubberized concrete (SCRC); fine rubber (FR); super plasticizer (SP); scanning electron microscope (SEM)
S. Padhi, Department of Civil Engineering, ITER, S\'O\'A University, Bhubaneswar, Odisha
K. C. Panda, Department of Civil Engineering, ITER, S\'O\'A University, Bhubaneswar, Odisha