[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

American Society of Civil Engineers

The author details the reactions of various concretes on steel reinforcement. Although portland cements, slag cements and high alumina cements are all hydraulic binders, each possess special properties which are examined. The discussion of causes and methods of preventing the corrosion of steel reinforcement covers such aspects as galvanised steel reinforcement, effects of concrete composition, corrosion of steel reinforcments in concrete and prestressed reinforcement. It is concluded that the most significant influences on the corrosion of prestressing wire in concrete are: the presence of chloride; the presence of nitrates; the composition of the concrete; the degree of carbonation of the concrete; concrete compaction and, chlorides and sulphates should be used as far as possible when steel is embedded. (TRRL)

Corrosion of steel by concrete

Intrinsic self-sensing concrete and structures: A review

Recycling and recovery routes for incinerated sewage sludge ash (ISSA): a review.

Both strain and damage sensing properties on carbon nanofiber cement composites (CNFCCs) are reported in the present paper. Strain sensing tests were first made on the material’s elastic range. The applied loading levels have been previously calculated from mechanical strength tests. The effect of several variables on the strain-sensing function was studied, e.g. cement pastes curing age, current density, loading rate or maximum stress applied. All these parameters were discussed using the gage factor as reference. After this first set of elastic experiments, the same specimens were gradually loaded until material’s failure. At the same time both strain and resistivity were measured. The former was controlled using strain gages, and the latter using a multimeter on a four probe setup. The aim of these tests was to prove the sensitivity of these CNF composites to sense their own damage, i.e. check the possibility of fabricating structural damage sensors with CNFCC’s. All samples with different CNF dosages showed good strain-sensing capacities for curing periods of 28 days. Furthermore, a 2% CNF reinforced cement paste has been sensitive to its own structural damage.

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Strain and damage sensing properties on multifunctional cement composites with CNF admixture

In this research, strain-sensing and damage-sensing functional properties of cement composites have been studied on a conventional reinforced concrete (RC) beam. Carbon nanofiber (CNFCC) and fiber (CFCC) cement composites were used as sensors on a 4 m long RC beam. Different casting conditions (in situ or attached), service location (under tension or compression) and electrical contacts (embedded or superficial) were compared. Both CNFCC and CFCC were suitable as strain sensors in reversible (elastic) sensing condition testing. CNFCC showed higher sensitivities (gage factor up to 191.8), while CFCC only reached gage factors values of 178.9 (tension) or 49.5 (compression). Furthermore, damage-sensing tests were run, increasing the applied load progressively up to the RC beam failure. In these conditions, CNFCC sensors were also strain sensitive, but no damage sensing mechanism was detected for the strain levels achieved during the tests. Hence, these cement composites could act as strain sensors, even for severe damaged structures near to their collapse.

/pdf/multifunctional-cement-composites-strain-and-damage-sensors-8otfn8kpvw.pdf

Multifunctional Cement Composites Strain and Damage Sensors Applied on Reinforced Concrete (RC) Structural Elements

Effect of aspect ratio on strain sensing capacity of carbon fiber reinforced cement composites

Mechanical and physical properties of cement blended with sewage sludge ash.

https://rua.ua.es/dspace/bitstream/10045/7811/4/aminofenol.pdf

Pedro Garcés

Papers

Strain and damage sensing properties on multifunctional cement composites with CNF admixture

Multifunctional Cement Composites Strain and Damage Sensors Applied on Reinforced Concrete (RC) Structural Elements

Effect of aspect ratio on strain sensing capacity of carbon fiber reinforced cement composites

Mechanical and physical properties of cement blended with sewage sludge ash.

Spectroelectrochemical study of the oxidation of diaminophenols on platinum electrodes in acidic medium