Lightweight Concrete Additives | High-Performance Foaming Agents for Cellular Concrete
A new type of concrete water reducer has been invented. It is grafted with lignosulfonate and carbonyl aliphatic compounds to improve its fluidity. The resultant graft water reducer has a good water reducing ratio and excellent compatibility with cement.
Lignosulfonate is a hydrophobic, low molecular weight compound, which is usually produced by modifying black liquor from paper making. Its adsorption to cement particles can be used to enhance the hydrating effect. However, it can also affect the setting and strength of the cement paste.
The morphology of the final product is also affected by the graft process. Lignosulfonate is formed from a lyophilic group, which is introduced into the lignin macromolecules. Nuna nyokwi elimina ya componentes ko 'nar masa molecular ir nge xki t'olo.
Lignosulfonato, 'nar molécula molecular hidratada ne compleja, pe̲ts'i mfeni pa reducir ar energía superficial ar interfaz sólido-líquido. Nxoge ar hidratación, yá aniones macromoleculares xi cargar negativamente ya partículas su̲mento. Nuna ar adsorción reduce ár hne zeta.
'nehe, pe nu'bu floculación partículas su̲mento finas. ár cadena orgánica hidrofílica polar to da zeti ya partículas su̲mento separadas ya repulsión electrostática.
varios factores, da 'ñent'i su̲mento ne composición admixture, afectan ar compatibilidad. Ar dosis habitual 'nar reductor ar dehe ar 0.3- 0.5% líquido ir nge ar be̲xu ar su̲̲.
dosis mäs altas 'nar reductor ar dehe xi causar ar retardo excesivo ne sangrado. Incompatibilidad entre ar su̲mento ne ar reductor ar dehe to da t'ot'e pérdida ngut'a ar funcionabilidad. 'Nar nt'udi, altas dosis 'nar reductor ar dehe xi producir 'nar reducción jar resistencia ar flexión ar hormigón, acelerar ar za ar pasta ar su̲mento, ne 'ñäni deterioro ár fluidez.