The Influence of Dredged of Natural Waste on Shrinkage Behavior of Self Compacting Concrete for Achieving Environmental Sustainability

Abstract

Every year, millions of cube meters are dredged from dams and restraints as an entertaining and prevention procedure all over the world. These dredged sediments are considered as natural waste leading to an environmental, ecological and even an economical problem in their processing and deposing.Nevertheless, in the context of the sustainable development policy, a way of management is opened aiming to the valorization of sediments as a building material and particularly as a new binder that can be industrially exploited and that improve the physical, chemical and mechanical characteristics of the concrete.This study is a part of the research works realized in the civil engineering department at the university of Mostaganem (Algeria), on the impact of the dredged mud of Fergoug dam on the behaviour of self-consolidating concrete in fresh and hardened state , such as the mechanical performance of SCC and its impact on the differed deformations (shrinkage). The work aims to valorize this mud in SCC and to show eventual interactions between constituents. The results obtained presents a good perspectives in order to perform SCC based in caclined mud.

Sedimentary Clays as Geopolymer Precursor

“…On laboratory scale the raw clay was dried first, crushed to a maximum particle size and sieving less than 80 um, subsequently calcined in a muffle electric furnace. The raw clay was calcined at 750 C° [21] for 3, 4 and 5 hours (heating rate: 25 C/min). Finally, calcined samples were putting in bags to protect them from moisture.…”

“…The main objective of this work is to study the possibility of using dredged sediments in the preparation of geopolymer cements. The approach consists first of all in optimizing a calcination time to have a better reactivity of the materials, a temperature of 750°C was chosen according to the bibliography [21], secondly to determine the effect of the different molarities of the activated solution on the mechanical properties of a geopolymer mortar. The results are characterized by analysis tools (FTIR, XRD, ATG and DSC)…”

Shrinkage Behaviour of Self-Compacting Concrete with Higher Binder Content: Experimental Results and Predictive Equation

“…The VMA category uses a chemical additive for mix stabilization, while the powder type relies on filler materials as a partial substitute for cement, thereby increasing the binder material content and promoting solidity [4]- [5]. The proportion of SCC varies from that of conventionally vibrated concrete (NVC), which can result in variations in both fresh and hardened properties [6]- [11].…”