| 摘要 |
<p>The invention concerns stable pumpable binder compositions, in particular for self-levelling systems. containing inter alia cement and other mineral constituents, such as fly ash, cinders, particulate materials and/or other pozzolans, and aggregates. The binder composition contains between 0.1 and 5.0 wt. % of mineral salts, such as thiosulphates, nitrates, nitrites, formates, halides, perchlorates, silicates, aluminates, hydroxides, carbonates and/or alkaline and/or alkaline-earth metal rhodanides; between 0.0001 and 0.5 wt. % of stabilising agent, such as a biopolymer, in particular xanthan gum and/or Welan gum and between 0 and 3.5 wt. % of a superfluidising agent, such as lignine sulphonate (LS), melanin and formaldehyde sulphonic acid condensate (MSFC), naphthalene and formaldehyde sulphonic acid condensate (NSFC), polycarboxylates, polyacyrylic acid derivatives and/or compound polymerisates and between 0.5 and 8.0 wt. % of a shrinkage reducer, such as diols and/or polyols, in particular glycols and/or glycol derivatives. The proportions indicated in weight percentage are relative to the binder.</p> |
