ARCHIVED REPORTS_XR0012640 - Laserfiche WebLink

Home Browse Search

r OWN e California Test 301 1978 Example Pnblem Sieve Size Saml)le AV. l Sample.\'n. 3 Check ......................................... (]00/92) x 72 = 78 (100192) x 20 = 22 78 -t- 22 = 100 % in......................................... (100192) X6 = 70 (100192) X 19 = 2'1 70 + 21 = 91 No. 4 ...................................... (100192) X 86 .= 61 (100!92) x 18 = 20 61 -1- 20 = 81 Check the sum of the components against the"a,; cause fractions have been rounded off. used" column.They may disagree by 1 percent be- Sic I-ej! e-SicI•es Sample.\'o._l SarnpleAb.? _ '/."to%................... (78-70) x (1?001100) = 96 grams (2O-21) X (1 2001100) = 12 grams %' to No.4.............. (70-61) X (1,W100) = 108 grams (21--20) x (1,2001L00) = 12 grams Passing No.4.......... (61- 0) X (1,2001100) = 73LLrams (20-0) X (1,2001 100) = 240 grains 936 -1- 9,64 = 1.200 grams G. THE BATCHING AND CURING OF SAMPLES TREAT- by 12-inch concrete cylinder cans (per sample) filled ED WITH PORTLAND CEMENT OR HYDRATED LIME to capacity.Seal the lids on the cans with tape and 1. Separate all passing No.4 material into approxi- ship the samples by the fastest means to the labora- mate quantities needed for each specimen. tory. 2. Recombine four 1,200-gram samples according9. These samples are not normally subjected to to the"as used"grading. sieve analysis,therefore,remove rock over'/.-inch in 3. Add the desired percentage of cement or lime size and separate the passing %-inch portion in a to each sample.The amount of cement or lime added riffle splitter directly to the 1,200-grarn batch w is expressed as a percentage of the dry weight of soil. �veights. 1t will not normally be necessary to add 4. immediately after each sample is batched,place `v iter(soaking water),as described in paragraph 6 of sample and its identification ticket into a y1-gallon Section F above since the material will usually con- can and secure the lid. Use of a different colored tain sufficient field moisture. ticket than used for untreated samples is desirable. 10. fabricate test specimens in the same manner 5. Add one-half to two-thirds the amount of mois- as for untreated materials (Part I Section J and Part lure necessary to saturate the sample rs described in 11 excluding Sections D 11 through D 21).Start com- paragruph 6 of Section f above. paction of specimens within 16 to 24 hours (inclu- 6. Allow the loose material to cure for 16 to 24 sive), after the mixing of aggregate, cement and hours in a covered 1/2-gallon can before proceeding as water together on the project.In the event that it is described in Section 1,"Mixing". extremely difficult to transport the sample to the 7. Do the mixing,compacting,exudation pressure; laboratory within this time restriction or there is a expansion pressure and stabilometer tests in the conflict with weekends (or holidays),it is permissi- same maturer as specified for untreated materials in ble to fabricate specimens up to,but not to exceed, Part I through Part V,respectively,except that the 96 hours after mixing,providing the R-values of the specimens must remain in the expansion pressure treated samples meet specified minimum re quire- devices for only the 16 to 24-hour period and stand- ments. However, if any R-value test Fails to meet ing over weekends or holidays is not permitted,as it specifications,then subsequent samples must be test- is in the case of untreated materials (Part IV,Section ed (start.specimen compaction) within the 16 to 24- D-9). hour time limit. 11. Perform balance of testing in the same manner Procedures for field control saenples as for untreated materials,except that the compact- 8. Fi i control samples which contain Portland ed test specimrmm shall not he retained in the expan- -- , ccmvnt r-Bine at--the:time of--sampiing-shall-be---cion pressure devices for less than-16 hours nor more----------, ------ shipped iuunediately to the laboratory in two 6-inch than 24 hours (Part IV,Section D-91. 3