EFFECT OF PLASTICIZERS CONTAINING LIGNIN ON THE HYDRATION AND VARIOUS PHYSICAL CHARACTERISTICS OF CEMENT PASTE

EINFLUSS LIGNINHALTIGER VERFLUESSIGNUNGSMITTEL AUF DIE HYDRATATION UND VERSCHIEDENE PHYSIKALISCHE EIGENSCHAFTEN VON ZEMENPASTEN

The quantity of water in cement paste which can evaporate decreases with ageing as it is used up in the hydration process. Admixtures influence neither the quantity nor the rate of decrease of evaporable water. The degree of hydration of cement paste increases with age and after cement paste has been immersed 7 days in water, it is not modified by admixtures. The use of the latter does not improve the crushing strength of cement paste when the water/cement ratio or water and admixture/cement ratio remains unchanged. Tests were carried out on samples continuously stored in wet conditions at 7, 28 and 84 days. It was seen that the addition of admixtures to cement paste results in a reduction in the rate of increase of elastic stress measured as soon as loads are applied up to the time when a constant stress/strength ratio is obtained. In this case the rate of increase in the modulus of elasticity measured immediately after load application is increased. The conclusion reached is that the modifications to the modulus of elasticity measured immediately after load application are determined by basic modifications occurring in the structure of the paste. These observations apply only in the case of admixtures containing lignin.

  • Corporate Authors:

    Bauverlag GmbH

    Wittelbacherstrasse 10
    6200 Wiesbaden,   Germany 
  • Authors:
    • Morgan, D R
    • WARD, M A
  • Publication Date: 1971-2

Language

  • German

Media Info

  • Features: Figures; References;
  • Pagination: p. 79-82
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00081666
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Feb 27 1975 12:00AM