Research on the interface and ­microstructure of thin layer mortar

Rapid water loss is one of the important characteristics of thin layer mortar. The testing methods, such as the velocity of water migration, the strength of interfacial bonding, XRD, SEM, FTIR and TG-DSC-DTG were used to research the interface and microstructure of thin layer mortar with continuous moisture migration from the thin layer mortar to aerated concrete. The results show that the rate and the amount of water migration on the interface from mortar to substrate dropped significantly with the increase of viscosity of mortar. There was also a good corresponding relation on the tensile bond strength of the interface and mortar viscosity, which means that the interface bonding strength increased with the increase of the viscosity of mortar.

1 Introduction

Thin layer mortar has been mostly considered as a special mortar, which possesses high water-cement ratio and high area/volume ratio [1].The common problem of the thin layer mortar system is that the a high proportion of water in thin layer mortar will be absorbed by the super absorbent matrix materials [2], then the thin mortar hardens rapidly in a short time due to the rapid loss of water, so the hydration degree is less, even less than 30 %; this has serious effect on the use and service life of construction.

Cellulose ethers (CE), with properties of water retention, thickening...

Related articles:

WO2019151485 (A1)

Cement composition and cured object obtained therefrom

(22) 01.02.2019 (43) 08.08.2019 (57) The present invention relates to a cement composition which comprises a cement, cellulose nanofibers, and water, wherein the mass ratio of the water to the cement...

PL429005 (A1)

Method for producing cement grouts with decreased shrinkage and the cement grout with decreased shrinkage

(22) 21.02.2019 (43) 29.07.2019 (57) The subject of the application is a method for producing cement paste with reduced shrinkage and cement paste with reduced shrinkage. This method consists in the...

Issue 2019-11 WO 2019/157593 A1

Desert sand and filamentous cellulose in concrete and mortar

(22) 12.02.2019 (43) 22.08.2019 (57) The present provides a concrete and mortar mix and composition thereof with poor quality sand such as desert sand, hydraulic binder (cement) and filamentous...

Issue 2017-5 US 2017/0057869 A1

Concrete having reduced surface drying time and cementitious compositions and methods for manufacturing same

(22) 01.07.2016 (43) 02.03.2017 (57) Cementitious compositions and methods for preparing and using the cementitious compositions to yield hardened concrete. The cementitious compositions yield...

Issue 2018-3 US 2017/0369375 A1

Cementitious blend and concrete mix compositions resistant to high temperatures and alkaline conditions

(22) 28.06.2016 (43) 28.12.2017 (57) A cementitious blend composition and a concrete mix composition preferable for making concrete resistant to high temperatures and alkaline conditions, particularly...