Laserfiche WebLink
500' <br />45r <br />40C <br />{] <br />ups • 350 <br />- 30C <br />25D <br />▪ 200 <br />15D <br />a <br />10D <br />50. <br />D <br />1 <br />Typ cal Void Range, <br />Isola:Eda-d'n:e•cannected''l: a <br />bow Voids Range, <br />Mostly Isolated Voids <br />Relationship Between In -Place <br />Air Voids and Permeability_ <br />T T <br />■ <br />-I ill-'vfc :la Fa d=. <br />Dsdy 1-ter.. n-=::e:I ':roil: <br />0.0 1.0 2-0 3-0 4.0 5.0 6.0 7.0 8.0 <br />Percent In-Piace Air Voids <br />Figure 2.3. Permeability vs. In -Place Air Voids (Cooley Jr., Brown and Maghsoodloo, 2001). <br />9.0 <br />/ 2.0 <br />Lottman Test (Mn/DOT Modified) <br />The moisture sensitivity was ascertained by performing modified Lottman tests in accordance <br />with ASTM D 4867, Mn/DOT modified (See Appendix A). The moisture sensitivity was gauged <br />by comparing splitting tensile test (Figure 2.4) results of control, or non -moisture conditioned <br />specimens (dry strength) against those of moisture conditioned specimens (wet strength). The <br />ratio of the wet strength to the dry strength represents the tensile strength ratio, or TSR. The <br />generally accepted minimum threshold value for TSR is 70%. <br />Figure 2.5 shows the TSR values vs. the air void content of the mix. All three TSR <br />values are above the 70% criterion; however, the increase in air voids appears to correspond with <br />a decrease in the TSR, which suggests reduced resistance to moisture induced damage. In <br />addition, the apparent relationship appears to suggest that a mixture with 17% air voids, would <br />have a TSR value of 70%. Figure 2.5 compares the visual appearance of the 'wet' and 'dry' <br />specimens after testing. From this figure, there does not appear to be a relationship between air <br />void content and stripping potential as all three sets appear to be relatively the same. <br />B-11 <br />