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Evaluation of Concrete Mixtures for Use in Underwater Repairs.

ADA635747

Publication Date	1988
Personal Author	Neeley, B. D.
Page Count	130
Abstract	Concrete mixtures were evaluated to determine which were most suited for placement underwater in thin lifts. The concretes were proportioned to have good workability, good abrasion-erosion resistance, and good resistance to washing out of the cement paste. High-range water reducers (HRWR) were used to increase the workability and permit the use of low water-cement ratios (W/C) to increase the resistance to abrasion-erosion. Low W/C, silica fume, and antiwashout admixtures (AWA) were used to increase the resistance to washout. A washout test was used to determine the relative amount of cement paste lost when the concrete is exposed to a large volume of water. The two-point workability test was used to evaluate the relative workability properties of each mixture. The slump and air content were also measured for most of the mixtures. The test method for abrasion-erosion resistance of concrete (underwater method) was used to determine the abrasion-erosion resistance of each mixture. The results of these tests were used to determine the combination of materials necessary to produce concrete with the desired properties. Significant correlations that exist between the two-point measurements and washout measurements were examined. The effects that W/C, HRWR's, AWA's, fly ash, and silica fume have upon washout resistance and abrasion-erosion resistance were examined.
Keywords	Concrete Repair Underwater structures Abrasion Erosion resistance Mixtures Wear resistance Abrasion-erosion resistance Antiwashout admixtures High-range water reducers Underwater placement of concrete mixtures Workability Wu32305
Source Agency	Non Paid ADAS
NTIS Subject Category	50C - Construction Equipment, Materials, & Supplies 44G - Environmental & Occupational Factors 89D - Structural Analyses
Corporate Authors	Army Engineer Waterways Experiment Station, Vicksburg, MS. Structures Lab.
Document Type	Technical Report
Title Note	Final rept.
NTIS Issue Number	201624

Evaluation of Concrete Mixtures for Use in Underwater Repairs.

Evaluation of Concrete Mixtures for Use in Underwater Repairs.
ADA635747

Publication Date	1988
Personal Author	Neeley, B. D.
Page Count	130
Abstract	Concrete mixtures were evaluated to determine which were most suited for placement underwater in thin lifts. The concretes were proportioned to have good workability, good abrasion-erosion resistance, and good resistance to washing out of the cement paste. High-range water reducers (HRWR) were used to increase the workability and permit the use of low water-cement ratios (W/C) to increase the resistance to abrasion-erosion. Low W/C, silica fume, and antiwashout admixtures (AWA) were used to increase the resistance to washout. A washout test was used to determine the relative amount of cement paste lost when the concrete is exposed to a large volume of water. The two-point workability test was used to evaluate the relative workability properties of each mixture. The slump and air content were also measured for most of the mixtures. The test method for abrasion-erosion resistance of concrete (underwater method) was used to determine the abrasion-erosion resistance of each mixture. The results of these tests were used to determine the combination of materials necessary to produce concrete with the desired properties. Significant correlations that exist between the two-point measurements and washout measurements were examined. The effects that W/C, HRWR's, AWA's, fly ash, and silica fume have upon washout resistance and abrasion-erosion resistance were examined.
Keywords	Concrete Repair Underwater structures Abrasion Erosion resistance Mixtures Wear resistance Abrasion-erosion resistance Antiwashout admixtures High-range water reducers Underwater placement of concrete mixtures Workability Wu32305
Source Agency	Non Paid ADAS
NTIS Subject Category	50C - Construction Equipment, Materials, & Supplies 44G - Environmental & Occupational Factors 89D - Structural Analyses
Corporate Authors	Army Engineer Waterways Experiment Station, Vicksburg, MS. Structures Lab.
Document Type	Technical Report
Title Note	Final rept.
NTIS Issue Number	201624