Sprayed concrete technology: the proceedings of the ACI/SCA by Simon Austin

By Simon Austin

The method of spraying concrete is among the so much flexible concrete putting recommendations, and is utilized in quite a lot of purposes - from building of latest tunnels, domes, tanks and swimming pools, to fix and strengthening of present constitution. The regular progress in curiosity and alertness within the procedure is mirrored during this publication, which brings jointly present overseas advancements in fabrics, program, fix, necessities and trying out. Sprayed Concrete expertise types the lawsuits of the foreign convention organised through the yankee Concrete Institute and the Sprayed Concrete organization in Edinburgh, Scotland, September 1996.

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Additional info for Sprayed concrete technology: the proceedings of the ACI/SCA International Conference on Sprayed Concrete/Shotcrete, ''Sprayed concrete technology for the 21st century'' held at Edinburgh University from 10th to 11th September 1996

Example text

These include conductive coatings applied to the surface of the concrete, metal probes embedded into the concrete and expanded mesh embedded in a sprayed concrete overlay onto the surface of the concrete. DYKES Fig. 2 Realkalisation Fig. 3 Realkalisation 3 Realkalisation Realkalisation is a technique to introduce an alkali solution into the cores concrete to the reinforcement to arrest and prevent further deterioration due to the carbonation process. Realkalisation is an electrochemical method to restore alkalinity that has been lost during the carbonation process.

The values of porosity were relatively low, but the oxygen permeability values were at least one order of magnitude higher than the values for “good concrete”. These findings lead to the belief that the mix in place had a considerable volume of capillary pores arising from the uneven pressure of compaction and some microcracking arising from the high cement content. These effects can be minimised by high standards of workmanship and careful control of the in-situ curing procedures. 4. The sodium oxide equivalent was in all cases above the limit recommended as a value to avoid alkali-silica reaction.

2). A fibre glass tank is fixed to the concrete encapsulating the anode mesh and filled with a sodium carbonate or calcium hydroxide solution at a calculated molar solution. A current density of 1 amp per m2 is applied to the anode. Sodium or calcium disassociate and are attracted towards the cathode. In transport they carry their respective Na1 CO3 or CA(OH)2 particles through the pour water towards the reinforcement. (Fig. 3). Soon after the system is powered up there is a drop in resistance between the anode and cathode.

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