cpi
Current Issue Flipbook

Trade Journals for the Concrete Industry

Current Issue Archive Online Flipbooks CPI TV Events Buyers' Guide Newsletter Advertising Subscription
Suchen

Precast element production


Modern special cements for fast-curing concrete

 


There is a great need for accelerated binders in concrete technology. It must thereby be decided whether the setting or the curing of the concrete should be accelerated. Proven systems are available for achieving fast setting. For example, the start of the setting process in spray concrete is shortened to an order of minutes by the use of spray concrete accelerators with alkalis (alkali silicate and aluminate) or without alkalis (aluminium sulphate and hydroxide). Until now there have been few options available for accelerating curing whilst maintaining an adequate processing time. The conventional measures offered by concrete technology for increasing early strength, such as higher cement content, low water-cement ratio and the use of cements of a high strength class do not lead to a satisfactory result in every case. The use of accelerating additives is also only possible to a limited extent, since many of these agents can lead to problems with corrosion of the reinforcing steel and are therefore not permitted for use in steel reinforced or prestressed concrete. Due to the lack of alternatives, heat treatment is often used to increase the early strength of precast concrete elements. The heat treatment is being increasingly called into question, in particular on account of rising energy prices, but also as a result of qualitative problems.

Show article
Download article
 


Contact


CPi worldwide journals are trade journals for the concrete and precast concrete industry that are published in 10 different language editions in more than 170 countries. These trade journals, with their practical editorial reporting on research, production and applications, are specifically addressing the decision makers of the concrete and precast concrete industry.

About us
Contact
ad-media GmbH

Industriestrasse 180
50999 Cologne
Germany

T: + 49 2236 96 23 90
F: + 49 2236 96 23 96
info@ad-media.de

Links
  • Magazine
  • CPi-tv
  • Events
  • Buyers' Guide
  • Newsletter
  • Advertising
  • Patents
  • ad-media GmbH
Social
  • Linkedin
RIGHTS
  • Imprint
  • Data Protection