Open AccessEffect of superabsorbent polymer solutions on structure formation and properties of cement compositions
Author(s) -
Aleksandr Inozemtcev,
Evgeniy Korolev,
Thanh Qui Duong
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/869/3/032002
Subject(s) - cement , superabsorbent polymer , portland cement , materials science , curing (chemistry) , hardening (computing) , polymer , polymerization , water–cement ratio , composite material , rheology , monomer , porosity , chemical engineering , layer (electronics) , engineering
The development of compositions with a set of properties that are indifferent to the influence of the environment during the setting and hardening of the binder is an actual task for material science in connection with the evolution of 3D-printers in construction. The use of SAP solutions with delayed polymerization should provide the water reserve in the cement system for internal curing without loss of mobility of the mixture. An important condition is the establishment of “parity” concentrations of the polyacrylate solution at which sorption of water does not reduce the degree of cement hydration. Calorimetric and X-ray phase analyzes showed that the SAP solution in an amount of not more than 1.0 % by weight of Portland cement has a positive effect on the structure formation processes of cement stone. The formation of a more perfect crystalline structure of cement stone is observed. The SAP content of more than 1.5% by weight of Portland cement leads to a decrease in the intensity of the maxima in the radiographs corresponding to the products of hydration of Portland cement. In this case, the less perfect crystalline structure of the cement stone is associated with the formation of physical barriers by the SAP film. It has been shown that the solutions of superabsorbent polymers allow to keep the water for hydration without loss of mobility, in contrast to granular additives. The obtained dependences of the rheological properties of cement mixtures and physico-mechanical properties of cement stone on the content of SAP indicate that the effective concentrations of SAP are 0.5…1.0% by weight of Portland cement.