Complex multifunctional additive for anchoring grout based on alkali-activated portland cement
Дата
2020
Автори
Krivenko, P. V.
Petropavlovskyi, O. M.
Rudenko, I. I.
Konstantynovskyi, O. P.
Kovalchuk, A. V.
Заголовок журналу
Журнал ISSN
Назва тому
Видавець
IOP Publishing
Анотація
Complex multifunctional additive (further, CA) which consists of aluminum
powder, surfactant, salt-electrolyte (NaNO3) and calcium sulfate hemihydrate (CaSO4∙0.5H2O)
is proposed for ensuring necessary properties of anchoring grouts based on alkali-activated
portland cement (further, AAPC) presented by the system «ordinary portland cement clinker -
sodium metasilicate». Specified consistency of fresh AAPC mortar along with it strength after hardening are provided by water reducing due to application of modified polyethylene glycol characterized by stability of molecular structure in AAPC hydration medium. CA influence on shrinkage mitigation in AAPC mortar is explained both water-reducing effect and gas release
with volume increasing during formation of dispersive-coagulation structure. Expansion of
crystallization-condensation structure is ensured due to stress of calcium hydrosulfoaluminate
3CaO∙Al2O3∙3СаSО4∙32H2O and calcium hydronitroaluminate ЗСаО∙А12О3∙Са(NO3)2∙10Н2О
which form due to presence of СаSО4∙0,5H2O and NaNO3 in CA. Time matching of gas release
with structure formation insures dense microstructure due to filling of pores by hydrated phases
that causes lower excess stress during crystallization. CA ensures necessary performances of
AAPC anchoring grout: consistency 190 mm; workability retention time 15 min; tensile
strength in bending / compressive strength 6.1 / 25.7 MPа and 12.9 / 68.5 MPa in 1 d and 28 d
agreeably; adhesion 0.9 MPa; linear extension up to +0.37 mm/m.
Опис
doi:10.1088/1757-899X/907/1/012055
Ключові слова
anchoring grout, alkali-activated portland cement, complex multifunctional additive, aluminum powder, surfactant, salt-electrolyte, calcium sulfate hemihydrate, кафедра технології будівельних конструкцій і виробів
Бібліографічний опис
Complex multifunctional additive for anchoring grout based on alkali-activated portland cement / P. V. Krivenko, O. M. Petropavlovskyi, I. I. Rudenko [ atc ] // IOP Conference Series : Materials Science and Engineering. - Vol. 907. - P. 1 - 9. – Bibliogr. : 45 titl.