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Methods for Controlling Effects of Alkali-Silica Reaction in Concrete.

ADA178479

Publication Date	1987
Personal Author	Buck, A. D.; Mather, K.
Page Count	66
Abstract	This research project concerned methods of minimizing the effects of alkali-silica reaction in concrete. Ten pozzolans were tested to determine how they could most effectively be used to maximize reduction of expansion due to alkali-silica reaction when the pessimum amounts of opal or of reactive glassy igneous rock were used as aggregate with cements of several levels of alkali content. Three of these pozzolans (fly ash AD-505, fly ash AD-509, and natural pozzolan AD-518) were selected for further work and were used at selected levels of cement replacement with pessimum amounts of opal, glassy igneous rock, and an estimated pessimum for chert with each of two high-alkali cements. In general, use of these pozzolans at their optimum levels was an effective procedure as expansions of several tenths of a percent were usually reduced to a few hundredths. It was also found that some fly ashes when used at about 30 percent cement replacement level actually caused more expansion, especially with low-alkali cement. This is believed to be due to the additional water-soluble alkali provided by the fly ash to the system.
Keywords	Concrete Fly ash Alkali metals Silicon dioxide Chemical reactions Cements Replacement Glass Igneous rock Optimization Reactivities Expansion Reduction
Source Agency	Non Paid ADAS
NTIS Subject Category	50C - Construction Equipment, Materials, & Supplies 89G - Construction Materials, Components, & Equipment
Corporate Authors	Army Engineer Waterways Experiment Station, Vicksburg, MS. Structures Lab.
Document Type	Technical Report
Title Note	Final rept.
NTIS Issue Number	198713

Methods for Controlling Effects of Alkali-Silica Reaction in Concrete.

Methods for Controlling Effects of Alkali-Silica Reaction in Concrete.
ADA178479

Publication Date	1987
Personal Author	Buck, A. D.; Mather, K.
Page Count	66
Abstract	This research project concerned methods of minimizing the effects of alkali-silica reaction in concrete. Ten pozzolans were tested to determine how they could most effectively be used to maximize reduction of expansion due to alkali-silica reaction when the pessimum amounts of opal or of reactive glassy igneous rock were used as aggregate with cements of several levels of alkali content. Three of these pozzolans (fly ash AD-505, fly ash AD-509, and natural pozzolan AD-518) were selected for further work and were used at selected levels of cement replacement with pessimum amounts of opal, glassy igneous rock, and an estimated pessimum for chert with each of two high-alkali cements. In general, use of these pozzolans at their optimum levels was an effective procedure as expansions of several tenths of a percent were usually reduced to a few hundredths. It was also found that some fly ashes when used at about 30 percent cement replacement level actually caused more expansion, especially with low-alkali cement. This is believed to be due to the additional water-soluble alkali provided by the fly ash to the system.
Keywords	Concrete Fly ash Alkali metals Silicon dioxide Chemical reactions Cements Replacement Glass Igneous rock Optimization Reactivities Expansion Reduction
Source Agency	Non Paid ADAS
NTIS Subject Category	50C - Construction Equipment, Materials, & Supplies 89G - Construction Materials, Components, & Equipment
Corporate Authors	Army Engineer Waterways Experiment Station, Vicksburg, MS. Structures Lab.
Document Type	Technical Report
Title Note	Final rept.
NTIS Issue Number	198713