Click for next page ( 48


The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement



Below are the first 10 and last 10 pages of uncorrected machine-read text (when available) of this chapter, followed by the top 30 algorithmically extracted key phrases from the chapter as a whole.
Intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text on the opening pages of each chapter. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

Do not use for reproduction, copying, pasting, or reading; exclusively for search engines.

OCR for page 47
47 Table 3.9. Plan for the durability tests, Stage III. Transpo DuralPrep DegaDeck SilACT Crack Sealate A.C. Control Width With Without With Without With Without With Without Batch (in.) REM REM REM REM REM REM REM REM 800 800 800 800 800 800 800 800 Number of Specimens, Stage III (Total = 69 Specimens) 0.000 3 0.007 3 3 3 - - 3 3 3 3 0.012 - - - - - - - - - 0.016 3 3 3 - - 3 3 3 3 0.033 3 3 - - - 3 - 3 - 0.054 3 3 - - - 3 - 3 - Total 15 12 6 - - 12 6 12 6 and 0.033-in. cracks treated only with DegaDeck) that were percent absorption results for Stage III of testing are given in unexpectedly water resistant in relation to the other specimens Tables 3.10 and 3.11. with that sealant may have been unintentionally administered The final results were fairly similar for each group of iden- extra sealant. The sample may also have been inadvertently tical specimens. This shows that the results gathered are con- tipped during application, allowing the sealant to pool in the sistent with one another and are repeatable. For clarification crack before drying. There was only one sample of each spe- purposes, the results from the three identical specimens were cific combination of sealant and crack size created, so an aver- averaged together and are shown in Tables 3.12 and 3.13. age of multiple specimens could not be found. Tables 3.12 and 3.13 show that DuralPrep A.C. was the best These inconsistent results led the team to repeat sections of performing sealant. It was the thickest sealant of those that the Stage II test before conclusions could be drawn. (See the were tested. It performed well both with and without the REM following section for information on the Stage III test.) 800 cementitious packing material, showing almost no mea- From Stage II of the durability tests, the four sealants were surable absorption of water in either case. Even with the rated from the analysis of the absorption results at 24 h and largest cracks, this thick sealant was able to fill the gap created the ease of application. Ratings are as follows, from the best to by the crack without leaving voids into which the water could the worst: seep. The reason that DuralPrep A.C. did not perform as well in Stage II of testing was that small openings appeared at 1. SilACT, the crack location, allowing water to seep into the hole in the 2. DegaDeck Crack Sealer Plus, sealant. The product itself is waterproof, however, the person 3. DuralPrep A.C., and applying the sealant must take care not to leave any open voids 4. Transpo Sealate T-70. in the layer of sealant. DuralPrep A.C. was the only sealant that gave acceptable results without REM 800. 3.4.4 Durability Test, Stage III The second-best-performing sealant was DegaDeck For Stage III of the Durability Test, the research team re- Crack Sealer Plus. With the REM 800, the specimens showed peated the procedure used in Stage II for DegaDeck, Dural- Prep A.C., and SilACT for the crack widths 0.007-in., 0.016-in., 0.033-in., and 0.054-in. Transpo Sealate T-70 was removed from the testing because it did not perform well with a vertical application, as shown in Stage II. The procedure used for Stage III of the durability test is iden- tical to the procedure for Stage II. However, each case contain- ing the same crack width and sealant combination had three separate specimens. Three batches of concrete were required to manufacture the 69 specimens for Stage III. Table 3.9 shows the Stage III durability test plan. Figure 3.57 shows hand appli- cation of REM 800 on Stage III specimens. 3.4.4.1 Stage III Test Results Water was allowed to soak in the dams on the specimens for 48 h. Readings were taken at both 24 h and 48 h, and the percent absorption for each specimen was determined. The Figure 3.57. Hand application of REM 800.

OCR for page 47
48 Table 3.10. Summary of 24-hour percent absorption for the durability test, Stage III. Crack Width Control DegaDeck DuralPrep A.C. SilACT (in.) 2.164 With Without With Without With Without 0.000 2.383 REM 800 REM 800 REM 800 REM 800 REM 800 REM 800 2.293 4.056 0.003 0.493 0.000 0.000 0.069 3.182 0.007 3.871 0.000 2.850 0.000 0.000 0.325 2.712 4.116 0.000 3.610 0.000 0.000 0.071 1.355 4.624 0.000 3.854 0.000 0.000 0.092 3.549 0.016 4.737 0.003 4.063 0.000 0.000 0.091 2.447 4.630 0.000 0.170 0.000 0.000 0.058 0.999 4.475 0.000 0.000 0.115 0.033 4.650 0.000 0.000 0.111 4.657 0.000 0.000 0.064 5.091 0.000 0.000 0.299 0.054 4.951 0.000 0.000 0.149 5.120 0.000 0.005 0.127 Table 3.11. Summary of 48-hour percent absorption for the durability test, Stage III. Crack Width Control DegaDeck DuralPrep A.C. SilACT (in.) 2.724 With Without With Without With Without 0.000 2.995 REM 800 REM 800 REM 800 REM 800 REM 800 REM 800 2.940 4.358 0.000 0.762 0.000 0.000 0.085 3.861 0.007 4.360 0.000 3.644 0.000 0.000 0.411 3.524 4.406 0.000 3.942 0.000 0.000 0.089 3.000 4.817 0.000 4.224 0.000 0.000 0.126 4.081 0.016 4.919 0.000 4.285 0.000 0.000 0.110 3.177 4.781 0.000 0.212 0.000 0.000 0.082 1.479 4.690 0.000 0.000 0.164 0.033 4.842 0.000 0.000 0.164 4.784 0.000 0.000 0.084 5.182 0.000 0.000 0.401 0.054 5.069 0.000 0.006 0.199 5.225 0.000 0.000 0.172 Table 3.12. Summary of 24-hour percent absorption for the durability test, Stage III. Crack Width Control DegaDeck DuralPrep A.C. SilACT (in.) With Without With Without With Without 0.000 2.280 REM 800 REM 800 REM 800 REM 800 REM 800 REM 800 0.007 4.014 0.001 2.318 0.000 0.000 0.155 2.416 0.016 4.663 0.001 2.696 0.000 0.000 0.081 2.332 0.033 4.594 0.000 0.000 0.097 0.054 5.054 0.000 0.002 0.192