Proceedings of the International Conference on Advances in Sustainable Construction
Materials & Civil Engineering Systems (ASCMCES-17)
Sharjah, United Arab Emirates, April 18 – 20, 2017
Resilient modulus for unbound
materials and subgrade soils in Egypt
granular
Rabah Mousa1, Alaa Gabr1, Mohamed G. Arab2, 3*, Abdelhalim Azam1,and Sherif ElBadawy1
1
Public Works Eng. Dept., Faculty of Engineering, Mansoura University, Mansoura, Egypt
Structural Eng. Dept., Faculty of Engineering, Mansoura University, Mansoura, Egypt
3
Department of Civil and Environmental Engineering, University of Sharjah, Sharjah, UAE
2
Abstract. Mechanistic Empirical (ME) pavement design methods started
to gain attention especially the last couple of years in Egypt and the Middle
East. One of the challenges facing the spread of these methods in Egypt is
lack of advanced properties of local soil and asphalt, which are needed as
input data in ME design. Resilient modulus (Mr) for example is an
important engineering property that expresses the elastic behavior of
soil/unbound granular materials (UGMs) under cyclic traffic loading for
ME design. In order to overcome the scarcity of the resilient modulus data
for soil/UGMs in Egypt, a comprehensive laboratory testing program was
conducted to measure resilient modulus of typical UGMs and subgrade
soils typically used in pavement construction in Egypt. The factors that
affect the resilient modulus of soil/UGMs were reviewed, studied and
discussed. Finally, the prediction accuracy of the most well-known Mr
Prediction models for the locally investigated materials was investigated.
*
[email protected]
Proceedings of the International Conference on Advances in Sustainable Construction
Materials & Civil Engineering Systems (ASCMCES-17)
Sharjah, United Arab Emirates, April 18 – 20, 2017
Sustainable building materials and earthen
construction technology
Saddek Mansouri, [email protected], Loubna Triki, and Sara Zeghichi.
ULT-FST-DA-TA. University Larbi Tebessi Faculty of Sciences and Technology Department of
Architecture 12200 Tébessa Algérie.
ULT-FST-DA-TA. University Larbi Tebessi Faculty of Sciences and Technology Department of
Architecture 12200 Tébessa Algérie.
ULT-FST-DA-TA. University Larbi Tebessi Faculty of Sciences and Technology Department of
Architecture 12200 Tébessa Algérie.
Abstract. Throughout Centuries, clay was used as a building material. It
is one of the most known and used materials worldwide for its wide
availability and low cost as well as its thermal properties. Historically, the
use of clay in construction in Algeria is very ancient; it is used not only in
the countryside, but also in many cities. Nearly all the traditional
constructions are built using an associated material, which included soil,
and other extra materials such as hay, mineral additives. Abandoned
recently for its low resistance to water, clay is becoming once again a good
material due to new techniques of stabilization and promotion of the
reinforced earth material for the future. One of the major concerns was to
improve the mechanical properties of the clay while keeping its essential
advantage of a low cost and sustain. For this purpose, some methods and
techniques are developed such as stabilization carried out in many
countries, and encouraged by the United Nations and have demonstrated
that, the earth was a relevant material, which, in most cases, had thermal
properties, and significantly economical higher than those of the cement
and concrete. So far, housing developers were content to meet minimum
standards of insulation, without using the heating system still bringing
comfort. One cannot relay only, on highly sophisticated techniques, to
design a more efficient housing, but by using natural elements such as
(sun, wind, clay and vegetation). Such idea, inserts man in his
environment, and truly is sustainable. Traditional housing, present beyond
its charm, architectural features allowing it to naturally adopt the climate
and use the properties of local materials. From previously implemented
solutions, it becomes a technique of reinforcing clay construction,
improving modern processes, adopting the needs of contemporary living
and comfort. Housing and climate become interdependent through a better
understanding and to a high mastery of the thermal buildings. Design a
building as a protective shell, providing climate control is optimized with
respect to natural features and local materials but not to stand against
climate and nature brutally using a heater or an air conditioner.
Proceedings of the International Conference on Advances in Sustainable Construction
Materials & Civil Engineering Systems (ASCMCES-17)
Sharjah, United Arab Emirates, April 18 – 20, 2017
Soil parameters identification around Menard’s
pressurmeter test by inverse analysis in SNTF
El-Harrach site
Ilhem Toumi1, Younes Abed1, Ali Bouafia1.
1
Faculty of Technology, Civil Engineering Department, University of Blida1, Algeria.
Abstract.The increasing use of finite elements method in geotechnical
design has also to be accompanied by appropriate methods in order to
identify the parameters of the adopted soil model. These parameters are
generally assessed on the basis of laboratory test results in SNTF El
Harrach site. This paper presents a methodology for identifying the
cohesive soil parameters that takes into account different constitutive
equations. The procedure, applied to identify the parameters of generalized
Prager model associated to the Drucker & Prager failure criterion from a
pressuremeter expansion curve, is based on an inverse analysis approach,
which consists of minimizing the function representing the difference
between the experimental curve and the curve obtained by integrating the
model along the loading path in the in-situ testing.
The model response on pressuremeter path and its identification from
experimental data lead to the determination of the friction angle, the
cohesion and the Young modulus.
A comparative study between two optimization processes is proposed. The
first is based on the technique of the simplex Nelder and Mead, the second
is based on the decomposition of the pressuremeter curve in three distinct
areas.
Proceedings of the International Conference on Advances in Sustainable Construction
Materials & Civil Engineering Systems (ASCMCES-17)
Sharjah, United Arab Emirates, April 18 – 20, 2017
Single pile behavior under cyclic axial Loading
in sand- Physical modeling in calibration
chamber
Mohammed Khouaouci1, Ali Bouafia2,*, Jean Canou3, Jean-Claude Dupla4, and Hadj
Bekki5.
1
Faculty of Civil Engineering, University of Sciences and Technology Houari Boumediene, 16111
Bab Ezzouar, Algiers, Algeria.
2
Department of Civil Engineering, Faculty of Technology, University of Blida-1, 09000 Blida,
Algeria.
3,4
Paris-Est University, Ecole des Ponts ParisTech, Navier Laboratory (CERMES), 6 et 8, avenue
Blaise Pascal, Champs-sur-Marne, 77455 Marne-La-Vallée, France.
5
Department of Civil Engineering, Faculty of Applied Sciences, University Ibn Khaldoun of Tiaret,
P.O.Box: 78, Zaâroura, 14000, Tiaret, Algeria.
Abstract. Piles used in civil and marine engineering are often subjected
to cyclic loading (vibrating machines, offshore platforms, wind
turbines…etc). Cyclic behavior of a single pile is a complex soil-pile
interaction that affects considerably the soil shear strength and the stiffness
as well, which should be quantified in order to take into account for the
pile foundation analysis and design. Experimental studies of full-scale pile
loading offer a pragmatic and attractive approach but they are
unfortunately eclipsed by their high coasts and the difficulty to conduct a
parametric study. Physical modeling in the calibration chamber allows a
local modeling of the soil-pile interaction under cyclic loading. This set-up
permits carrying out the tests under controlled and repeatable experimental
conditions, which confers an importance to the results obtained by this
approach. The aim of this paper is to describe physical modeling tests
carried out into the calibration chamber of the Navier Labarotory (France)
to study the behavior of an instrumented pile model jacked into sand. A
description of the calibration chamber, the loading protocol and the results
of a typical test was made. The evolution of local skin friction at the soilpile interface, under cyclic axial loading at very large number of cycles
(105 cycles) are also presented.
Proceedings of the International Conference on Advances in Sustainable Construction
Materials & Civil Engineering Systems (ASCMCES-17)
Sharjah, United Arab Emirates, April 18 – 20, 2017
Derivation of minimum steel ratio: based on
service applies stresses
Humam AL Sebai, Dr. Salah Al Toubat
University of Sharjah, Sharjah city, UAE
Abstract: Reinforced concrete beams undergo several design stages
starting with the immediate application of loading and till the ultimate
failure of the beam. In many practical applications the beam is designed to
function in the service stage during which steel plays a major role in the
determination of the location of the Neutral axis. The ACI code
implements several provisions on the minimum steel ratio in order to
encourage ductile behaviour of the beam and to prevent against the
unfavourable scenario of a sudden failure. The ACI 318-08 provisions
encompass a derived expression to calculate the minimum amount of
flexural reinforcement that is independent of concrete strength. This paper
suggests an expansion to the formula by deriving the minimum steel ratio
based on the modulus of rupture and the applied service stresses. The
special case for a cracking bending moment is extrapolated from the
suggested formula and the result is compared to different minimum steel
area formulas.