Grafted Concrete Water Reducer

Ib hom tshuaj txo dej pob zeb tshiab tau tsim. Nws tau grafted nrog lignosulfonate thiab carbonyl aliphatic compounds kom txhim kho nws qhov dej ntws. Cov tshuaj txo dej graft no muaj qhov piv txo dej zoo thiab haum zoo nrog cement.

Lignosulfonate yog hydrophobic, cov tshuaj molecular hnyav tsawg, uas feem ntau tsim los ntawm kev hloov kua dub los ntawm kev ua ntawv. Nws cov adsorption rau cement particles tuaj yeem siv los txhawb kev hydrating. However, nws kuj tuaj yeem cuam tshuam rau kev teeb tsa thiab zog ntawm cement paste.

Qhov morphology ntawm cov khoom kawg kuj raug cuam tshuam los ntawm txoj kev graft. Lignosulfonate tsim los ntawm ib pawg lyophilic, uas muab tso rau hauv lignin macromolecules. Qhov kev hloov no tshem tawm cov khoom uas muaj molecular mass me dhau.

Lignosulfonate, a hydrated and complex molecular molecule, has the ability to reduce the surface energy of the solid-liquid interface. During hydration, its macromolecular anions can negatively charge the cement particles. This adsorption reduces the zeta potential.

Besides, it can prevent flocculation of fine cement particles. Its polar hydrophilic organic chain can keep the cement particles separated by electrostatic repulsion.

Several factors, including cement and admixture composition, affect compatibility. The usual dosage of a water reducer is 0.3- 0.5% liquid by weight of the cement.

Higher dosages of a water reducer can cause excessive retardation and bleeding. Incompatibility between the cement and water reducer can lead to rapid loss of workability. Piv txwv li, Kev siv dej txo ntau yuav ua rau pob zeb muaj zog nkhaus tsawg dua, Ua kom cement paste ruaj khov sai dua, Thiab pab kom nws qhov dej ntws puas lawm.