Strength and Shrinkage of Natural Pozzolanic Mortar in Hot Weather
Publication: Journal of Materials in Civil Engineering
Volume 4, Issue 2
Abstract
Natural pozzolans (NP) have been introduced as partial cement replacement to minimize some durability problems encountered with ordinary portland cement (OPC) use in the Arabian Gulf. However, NP addition affects concrete drying shrinkage and leads to a slower strength development, which makes a longer curing time necessary. This research compares the strength and drying shrinkage of NP mortar cured under hot‐weather Gulf conditions and under normal conditions. The effect of various NP replacements was also evaluated in this study. Under hot weather, results showed that OPC mortar generally maintained higher strength than NP mortars. Also, under hot weather, mortar strength increased in early ages at a higher rate than that of normally cured mortars. However, the strength of these hot‐weather samples declined at later ages, while normally cured ones maintained their strength increase. Shrinkage results showed that normally cured NP samples have lower shrinkage values than those of OPC. However hot‐weather NP samples showed early higher shrinkage values than OPC; but later, at one year of age, all samples showed approximately equal values. Moreover, shrinkage of hot‐weather NP samples decreased as their initial normal curing periods increased.
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References
1.
Chatterji, S., Collepardi, M., and Moricono, G. (1983). “Pozzolanic property of natural and synthetic pozzollans: A comparative study.” Fly ash, silica fume, slag and other mineral by‐products in concrete: ACI Publication SP‐79, V. M. Malhotra, ed., American Concrete Institute (ACI), Detroit, Mich., 221–234.
2.
“Concrete in sulfate‐bearing soils and ground water.” (1981). Building Res. Establishment Digest 250.
3.
Dhir, R. K., Munday, J. G. L., and Ong, J. T. (1984). “Investigations of the engineering properties of OPC/pulverized fuel ash concrete: Strength development and maturity.” Tech. Note 404: Proc., Inst. of Civ. Engrs., Part 2, 77, 239–254.
4.
Diamond, S. (1981). “Effects of two Danish fly ashes on alkali contents of pore solutions of cement fly ash pastes.” Cement and Concrete Res., 11, 383–394.
5.
Dunstan, E. R., (1984). “Fly ash and fly ash concrete.” Report no, REC/ERC‐8182, Bureau of Reclamation, Denver, Colo.
6.
Feldman, R. F., and Sereda, P. J. (1970). “A new model for hydrated cement and its practical application.” Engrg. J., 53(9), 53–59.
7.
Franklin, R. E. (1981). “The effect of pulverised fuel ash on the strength of pavement‐quality concrete.” TRRL Lab. Report 982, Crowthorne, Berkshire, England.
8.
Gebler, S. H., and Klieger, P. (1986). “Effect of fly ash on physical properties of concrete.” Fly ash, silica fume, slag and natural pozzolans in concrete; Proc., 2nd Int. Conf.: ACI Publication SP‐91, V. M. Malhotra, ed., American Concrete Institute (ACI), Detroit, Mich., 1–50.
9.
Guidance note: Minimizing the risk of alkali‐silica reaction. (1983). Cement and Concrete Association, London, England.
10.
Hobbs, D. W. (1988). “Carbonation of concrete containing pfa.” Mag. of Concrete Res., 40(143), 69–78.
11.
Hong, S. W., and Lee, J. H. (1989). “Use of fly ash concrete for rigid pavement.” 11th IRF World Meeting, Seoul, Korea, 18–22.
12.
Hooton, R. D. (1986). “Properties of high‐alkali lignite fly ash in concrete.” Fly ash, silica fume, slag and natural pozzolans in concrete: Proc., 2nd Int. Conf.: ACI Publication SP‐91, V. M. Malhotra, ed., American Concrete Institute (ACI), Detroit, Mich., 332–346.
13.
“Hot weather concreting.” (1977). ACI 305R‐77, American Concrete Institute (ACI), Detroit, Mich.
14.
Kasai, Y., Matsui, I., Fukushima, Y., and Kamohara, H. (1983). “Air permeability and carbonation of blended cement mortars.” Fly ash, silica fume, slag and other mineral by‐products in concrete: ACI Publication SP‐79, V. M. Malhotra, ed., American Concrete Institute (ACI), Detroit, 435–452.
15.
Kayyali, O. A. (1984). “Application of non‐destructive methods in assessing concrete durability.” 3rd Int. Conf. on the Durability of Building Mat. and Components, Epsoo, Finland, 486–499.
16.
Marsh, B. K., Day, R. L., and Bonner, D. G. (1986). “Strength gain and calcium hydroxide depletion in hardened cement pastes containing fly ash.” Mag. of Concrete Res., 38(134).
17.
Meland, I. (1986). “Use of fly ash in cement to reduce alkali‐silica reactions.” Fly ash, silica fume, slag and natural pozzolans in concrete; Proc., 2nd Int. Conf: ACI Publication SP‐91, V. M. Malhotra, ed., American Concrete Institute (ACI), Detroit, Mich., 591–608.
18.
Mehta, P. K. (1980). “Performance tests for sulfate resistance and alkali‐silica reactivity of hydraulic cements,” Durability of Building Materials and Components: ASTM STP 691, ASTM, Philadelphia, Pa., 336–345.
19.
Mehta, P. K. (1983). “Pozzolanic and cementitious by‐products as mineral admixtures for concrete—a critical review.” Fly ash, silica fume, slag and other mineral by‐products in concrete: ACI Publication SP‐79, V. M. Malhotra, ed., American Concrete Institute (ACI), Detroit, Mich., 1–46.
20.
Neville, A. M. (1981). Properties of concrete, 3rd Ed., Pitman Publishing Inc., 382–383.
21.
Neville, A. M., and Brooks, J. J. (1987). Concrete technology. Longman Group U.K. Limited, 34.
22.
Popovics, S. (1986). “What do we know about the contribution of fly ash to the strength of concrete.” Fly ash, silica fume, slag and natural pozzolans in concrete; Proc., 2nd Int. Conf.: ACI Publication SP‐91, V. M. Malhotra, ed., American Concrete Institute (ACI), Detroit, Mich., 313–332.
23.
Ramachandran, V. S., Feldman, R. F., and Beaudoin, J. J. (1981). Concrete science: Treatise on current research.” Heyden, London, England.
24.
Rivera, V. R. (1986). “Effect of temperature on the properties of mortars and superplasticized concrete containing low‐calcium fly ash. Fly ash, silica fume, slag and natural pozzolans in concrete; Proc. 2nd Int. Conf.: ACI Publication SP‐91, V. M. Malhotra, ed., American Concrete Institute (ACI), Detroit, Mich., 219–230.
25.
Samarin, A., Munn, R. L., and Ashby, J. B. (1983). “The use of fly ash in concrete—Australian experience.” Fly ash, silica fume, slag and other mineral by‐products in concrete: ACI Publication SP‐79, V. M. Malhotra, ed., American Concrete Institute (ACI), Detroit, Mich., 143–172.
26.
Simons, D. D., Pasko, T. L., Jr., and Jones, W. R. (1981). “Properties of portland cement concretes containing pozzolanic admixtures.” Report No. FHWA/RD‐81‐184, Federal Highway Administration, Washington, D.C.
27.
Soroka, I. (1979). Portland cement paste and concrete. The Macmillan Press Ltd., London, England, 90–95.
28.
“Standard practice for selecting proportions for normal, heavyweight and, mass concrete.” (1981). ACI 211.1‐81, American Concrete Institute (ACI), Detroit, Mich.
29.
Sturrup, V. R., Hooton, R. D., and Clendenning, T. G. (1983). “Durability of fly ash concrete.” Fly ash, silica fume, slag and other mineral by‐products in concrete: ACI Publication SP‐79, V. M. Malhotra, ed., American Concrete Institute (ACI), Detroit, Mich., 71–86.
30.
Swamy, R. N. (1987). “Alkali aggregate reaction.” Notes, Kuwait Institute for Scientific Research, Kuwait City, Kuwait.
31.
Swamy, R. N., and Lambert, G. H. (1986). “Shrinkage and creep behavior of concrete made with pfa coarse aggregates.” Fly ash, silica fume, slag and natural pozzolans in concrete; Proc., 2nd Int. Conf: ACI Publication SP‐91, V. M. Malhotra, ed., American Concrete Institute (ACI), Detroit, Mich., 145–170.
32.
“Use of fly ash in concrete: ACI 226.3R‐87.” (1987). ACI Mat. J., 381–409.
33.
Walsh, P. F. (1986). “Fly ash and durability in the Australian concrete code.” Fly ash, silica fume, slag and natural pozzolans in concrete; Proc., 2nd Int. Conf: ACI Publication SP‐91, V. M. Malhotra, ed., American Concrete Institute (ACI), Detroit, Mich., 681–692.
34.
Yamato, T., and Sugita, H. (1983). “Shrinkage and creep of mass concrete containing fly ash.” Fly ash, silica fume, slag and other mineral by‐products in concrete: ACI Publication SP‐79, V. M. Malhotra, ed., American Concrete Institute (ACI), Detroit, Mich., 87–102.
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Copyright © 1992 ASCE.
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Published online: May 1, 1992
Published in print: May 1992
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