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ASTM Selected Technical Papers
Masonry: Opportunities for the 21st Century
By
D Throop
D Throop
1Diane Throop PE, LLC
Symposium Co-chair and STP Editor
Search for other works by this author on:
RE Klingner
RE Klingner
2
Symposium Co-chair and STP Editor
?
The University of Texas
at
Austin
Search for other works by this author on:
ISBN-10:
0-8031-3450-9
ISBN:
978-0-8031-3450-8
No. of Pages:
295
Publisher:
ASTM International
Publication date:
2002

Alone, neither a pozzolan nor hydrated lime is capable of setting under water. They are not hydraulic. When combined and mixed with water, however, the resulting reaction products are hydraulic. There is a renewed interest in pozzolan-lime binders, in particular for historic masonry. ASTM C593 provides a limited resource in defining suitable pozzolans to be used with lime for masonry mortars and exterior plasters. One of its limitations is that the specified pozzolan-lime weight ratio is not representative of a traditional volumetric ratio of one volume part binder to three volume parts sand. In addition, the standard requires accelerated curing, which is unrealistic for pozzolan-lime mortar.

Preliminary results indicate that using specific ratios of pozzolan to lime and a vapor curing regime, as required by ASTM C593, does not necessarily promote the optimum pozzolanic reaction as tested by compressive strength. Results from ASTM C593 therefore do not represent the expected field behavior of pozzolan-lime mortars. The requirements of that standard should be modified with respect to pozzolan-lime ratios and curing conditions.

1.
Borona
,
G.
and
Binda
,
L.
, “
Study of the Pozzolanicity of some Bricks and Clays
,”
Proceedings of the 10th International Brick and Block Masonry Conference
, Vol.
3
,
Calgary
,
1994
, pp. 1189–1197.
2.
Martirena Hernáandez
,
J.F.
,
Middendorf
,
B.
,
Gehrke
,
M.
and
Budelmann
, “
Use of Wastes of the Sugar Industry as Pozzolana in Lime-Pozzolana Binders: Study of the Reaction
,
Cement and Concrete Research
 0008-8846, Vol.
28
, No.
11
,
1998
, pp. 1525–1536,
3.
Shi
,
C.
, “
Studies of Several Factors Affecting Hydration and Properties of Lime-Pozzolan Cements
,
Journal of Materials in Civil Engineering
,
2001
, pp. 441–445.
4.
Mehta
,
P. K.
, “
Concrete, Structure, Properties and Materials
”,
Prentice-Hall, Inc
,
1986
, pp. 450.
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