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Journal of Materials and Engineering Structures

Number 4, 2016

149-160
Soil treatment by vibroflottation – Application to protection structures of DjenDjen port, Jijel, Algeria

Authors: Houssam Khelalfa

Abstract

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Number of views: 606

Soil treatment by vibroflotation is a recent technique for improving soil with poor geo-mechanical properties. In addition, this treatment minimizes the risk of liquefaction and the instability of the caisson. This work allows us to establish a two-dimensional numerical simulation of a real vibroflotation test, based on our model and our hypothesis of modeling this mechanism in finite elements. On the other hand, the work consists in making a two-dimensional numerical study of the stability of the caisson carried out on the treated soil, in order to verify its influence on the stability of the structure. The calculation results will be compared with in-situ measurements to validate the numerical model.

161-166
Effect of Lime Powder and Metakaolin on Fresh and Hardened properties of Self Compacting Concrete

Authors: Rizwan A Khan, Atul Sharma

Abstract

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Number of views: 787

This study investigated the fresh and hardened properties of Self-Compacting Concrete (SCC) with different types and amounts of admixtures. Six mixes were prepared by replacing 30% of cement with different percentages of fly ash (FA), lime powder (LP) and metakaolin (MK). Water- Cement ratio was kept constant at 0.41 and superplasticizer dosage of 1% by weight of cement. The filling and passing ability were investigated through Slump Flow, J-Ring, V-funnel and L-box test before filling the moulds. The compressive strength of hardened SCC cubes was also measured after specified days of curing (7, 14, 28 & 60 days). The workability test results showed that as FA was replaced by increasing percentages of LP and MK, the mixes became dense and hence less workable. It was observed that the compressive strength showed an increase with increasing percentage replacement of FA with LP and MK. This increase was higher for mixes with MK than that of mixes with LP.

167-180
Cost Effective Design of Sustainable Concrete Using Marble Waste as Coarse Aggregate

Authors: Sudarshan D. Kore, A. K. Vyas

Abstract

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Number of views: 502

In the present study attempts have been made to obtain sustainable and cost effective concrete product by use of marble waste. Aggregate obtained from marble quarry waste was used as 75% part of coarse aggregate and rest was conventional coarse aggregate. It was observed that, compressive strength was almost same as that of the control concrete. Durability properties like permeability and chloride ion penetration improved by approximately 30% and 15%, respectively. Resistance to acids and carbonation were least affected. Cost comparison showed with 20% less cement requirement, 14% reduction in cost of concrete was achieved when marble waste was used with packing density approach for design of concrete mixes. By minimizing the cement content without losing mechanical and durability properties of concrete resulting in reduction of global cement production from 4.2 billion tons to 3.36 billion tons and correspondingly it reduces CO2 emission from 3.95 billion tons by 0.79 billion tons.

181-195
Seismic Retrofitting: Reinforced concrete shear wall versus CFRP reinforced concrete using pushover analysis

Authors: Y. Riyad, B. Kissi, I. Mrani, M.A. Parron, R.C.M. Dolores

Abstract

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Number of views: 777

Seismic retrofitting of constructions vulnerable to earthquakes is a current problem of great political and social relevance. During the last sixty years, moderate to severe earthquakes have occurred in Morocco (specifically in Agadir 1960 and Hoceima 2004). Such events have clearly shown the vulnerability of the building stock in particular and of the built environment in general. Hence, it is very much essential to retrofit the vulnerable building to cope up for the next damaging earthquake. In this paper, the focus will be on a comparative study between two techniques of seismic retrofitting, the first one is a reinforcement using carbon fiber reinforced polymer (CFRP) applied to RC elements by bonding , and the second one is a reinforcement with a shear wall. For this study, we will use a non-linear static analysis -also known as Pushover analysis - on a reinforced concrete structure consisting of beams and columns, and composed from eight storey with a gross area of 240 m², designed conforming to the Moroccan Seismic code

197-204
The effects of production methods on the compressive strength of hollow sandcrete blocks

Authors: Abdulwahab Rasheed, Tunde Monsuru Akinleye

Abstract

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Number of views: 820

The high demand for sandcrete block for the development of physical infrastructures in Nigeria makes it important in building and construction industry. This research assessed three local methods of producing sandcrete blocks of sizes nine (9’’) and six (6’’) inches respectively. The methods used in producing the blocks were manual compaction, hand ramming and power operated method. Mix ratio of 1:9; a head pan of cement to nine head pans of sharp sand was used in all the methods. The materials (sand & cement) were thoroughly mixed until a homogenous mix with uniform color was obtained. Curing was done by sprinkling water on the specimens three times daily for 28 days and the compressive strength of the blocks was determined on the 7th, 14th, 21st, 28th days respectively. The study revealed that compaction has greater effect on the compressive strength of sandcrete blocks in the sense that blocks produced using vibrating machine has the highest compressive strength amongst the three methods.

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