skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Protective coatings for concrete

Abstract

The new two-layer protective coating developed for monuments constructed of limestone or marble was applied to highway cement and to tobermorite, a component of cement, and tested in batch dissolution tests. The goal was to determine the suitability of the protective coating in retarding the weathering rate of concrete construction. The two-layer coating consists of an inner layer of aminoethylaminopropylsilane (AEAPS) applied as a 25% solution in methanol and an outer layer of A2** sol-gel. In previous work, this product when applied to calcite powders, had resulted in a lowering of the rate of dissolution by a factor of ten and was shown through molecular modeling to bind strongly to the calcite surface, but not too strongly so as to accelerate dissolution. Batch dissolution tests at 22 C of coated and uncoated tobermorite (1.1 nm phase) and powdered cement from Gibson Blvd. in Albuquerque indicated that the coating exhibits some protective behavior, at least on short time scales. However, the data suggest that the outer layer of sol-gel dissolves in the high-pH environment of the closed system of cement plus water. Calculated binding configuration and energy of AEAPS to the tobermorite surface suggests that AEAPS is well-suited as the innermore » layer binder for protecting tobermorite.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
756038
Report Number(s):
SAND97-2940
TRN: AH200021%%107
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 May 2000
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CONCRETES; CEMENTS; PROTECTIVE COATINGS; CORROSION RESISTANCE; WEATHERING; DISSOLUTION; FIELD TESTS

Citation Formats

NAGY, KATHRYN L., CYGAN, RANDALL T., BRINKER, C. JEFFREY, and SELLINGER, ALAN. Protective coatings for concrete. United States: N. p., 2000. Web. doi:10.2172/756038.
NAGY, KATHRYN L., CYGAN, RANDALL T., BRINKER, C. JEFFREY, & SELLINGER, ALAN. Protective coatings for concrete. United States. doi:10.2172/756038.
NAGY, KATHRYN L., CYGAN, RANDALL T., BRINKER, C. JEFFREY, and SELLINGER, ALAN. Mon . "Protective coatings for concrete". United States. doi:10.2172/756038. https://www.osti.gov/servlets/purl/756038.
@article{osti_756038,
title = {Protective coatings for concrete},
author = {NAGY, KATHRYN L. and CYGAN, RANDALL T. and BRINKER, C. JEFFREY and SELLINGER, ALAN},
abstractNote = {The new two-layer protective coating developed for monuments constructed of limestone or marble was applied to highway cement and to tobermorite, a component of cement, and tested in batch dissolution tests. The goal was to determine the suitability of the protective coating in retarding the weathering rate of concrete construction. The two-layer coating consists of an inner layer of aminoethylaminopropylsilane (AEAPS) applied as a 25% solution in methanol and an outer layer of A2** sol-gel. In previous work, this product when applied to calcite powders, had resulted in a lowering of the rate of dissolution by a factor of ten and was shown through molecular modeling to bind strongly to the calcite surface, but not too strongly so as to accelerate dissolution. Batch dissolution tests at 22 C of coated and uncoated tobermorite (1.1 nm phase) and powdered cement from Gibson Blvd. in Albuquerque indicated that the coating exhibits some protective behavior, at least on short time scales. However, the data suggest that the outer layer of sol-gel dissolves in the high-pH environment of the closed system of cement plus water. Calculated binding configuration and energy of AEAPS to the tobermorite surface suggests that AEAPS is well-suited as the inner layer binder for protecting tobermorite.},
doi = {10.2172/756038},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}