Vízügyi Közlemények, 1974 (56. évfolyam)
4. füzet - Szilágyi László-Szilvássy Zoltán: A kolkrét beton és alkalmazási lehetőségei a vízépítésben
546 Szilágyi L. és Szilvássy Z. 42. Brüx, G. : Wege zur Automation in der Sonderbetonaufbereitung (Az automatizálás módjai különleges betonok készítésénél), Baumaschine-Bautechnik, 1969/9. 43. Colcrete beton alkalmazása a Ráckevei Duna szakaszon a Ráckevei (Soroksárij-Duna Intéző Bizottság adatszolgáltatása 1973. Ц1. 30. 44. Szilányi László — Szilvássy Zoltán: Újítási javaslat, 1968. november 8. 45. Szilányi László: Szakvélemény a bácskokodi tározógát szigetelési és hullámvédelmi munkáihoz, VITUKI szakvélemény, 1972. november. * * * Colerate and its potential applications in hydraulic engineering by Szilágyi, László and Szilvássy, Zoltán, Civ. Engrs. The method of concrete placement known as "colcrete" (colloidal concrete) and the new methods of construction made possible by its application in hydrotechnical construction are reviewed in the paper. In Chapter 1. the theory of colcrete, the method of mixing, further the properties of the grouts and concrete made thereby are described. The essential feature is identified as the colloidal cement grout dispersed intensively in the mixing turbine. This can be used for stabilization grouting, while mixed with fine aggregate as fine concrete, or for filling the voids of the coarse aggregate placed previously into the formwork. The beneficial properties of the fresh cement grout, such as viscosity, thixotropy and stability are examined in relation to their effects on concrete, including reduced shrinkage, higher density, strength, impermeability and durability, as well as the absence of heat of hydration. The cements manufactured in Hungary are analysed for their applicability in this process and the availability of suitable fine- and coarse aggregates is examined. In Chapter 2. the mechanical equipment needed for this method of concrete making is described, starting with the mixers (Fig. 1.) and the grout pumps (Fig. 2.) followed by listing the wearing parts (Fig. 3.), as well as the auxiliary devices needed for checks, measurements and other purposes. These include the thermal probe (Fig. 4.) for checking the rise of grout in the coarse aggregate. Examples are given for the mobile arrangement of the mechanical complex, Fig. 5. illustrating a truck-mounted mixer. Chapter 3. presents a review of the potential applications in hydraulic engineering. Foreign examples are quoted for the placement of mass concretes, underwater concrete (Fig. 6.), for the grouting of rock- and rip-rap linings (Figs. 7. and 8.), for colcrete mattresses used as linings on slopes above- and under the water level, including continuous mattresses (Fig. 10.), slab mattresses (Fig. 11.) and perforated mattresses (Fig. 12.). The first of these applications is shown in Fig. 13. Similar linings and slope protection covers, stilling-pool revetments are illustrated in Figs . 14. to 19. The uses ol plastic containers in hydrotechnical construction are described hereafter, these containers being hoses made of high-strength synthetic fabric and filled with colcrete fine concrete or grout. Such applications are shown in Figs. 20. and 21., while other applications are illustrated in Figs. 22. and 23. Concerning potential domestic applications it is emphasised that colcrete can be used advantageously to replace cement concretes, grouts, gunite concretes and grouts, further injection grouts made by conventional methods. In Chapter 4. the economic aspects of the colcrete method are discussed. A cost estimate is presented first for mass concrete (Fig. 24.), where the saving made possible by the use of colerete amounts to 47% at two construction sites. The saving estimated in the case of underwater concrete ( Fig. 25.) is 66 and 71.5% respectively, while in the case of slope lining (Fig. 26.) this is 39 and 42%, respectively. For slope and channel linings (Fig. 27.) colcrete-filled mattresses proved slightly more
