DateLaboratory Testing of Portland Cement Concrete Patch Material ...

HydrocureADDITIONAL TESTING OF LWFASAMPLE NUMBER: 12 B ATTEMPT: 1 STSAMPLE DESCRIPTION: Mn/DOT 3U18 w/ Hydrocure (LWFA)WATER/CEMENT RATIO: 0.395DATE MIXED: 2/6/03BATCH COMPONENTSCOARSE AGGREGATE:73.23 lbFINE AGGREGATE: 35.78 lbCEMENT: 45.01 lbDESIGN WATER: 17.77 lbAIR ENTRAINING ADMIXTURE: 70 mLOTHER: 35.78 lbDETAILS / SUPPLIER3/8" PEA GRAVEL (WINGRA)APPLETON QUARRYTYPE III (LAFARGE)DARAVAIR 1400 (GRACE)HYDROCURE(17.8% moisture content)NOTE: At the suggestion of John Roberts (Northeast Solite Corporation/MidwestLightweight Aggregate Corporation), an additional batch of Sample 12 was mixed witha larger proportion of lightweight fine aggregate (LWFA). For this batch, 50 percent ofthe sand (fine aggregate) was replaced with LWFA (the replacement in Phase I rangedfrom 19 to 22 percent, depending on the moisture content of the LWFA). The testinglisted below evaluates the effects of a 50 percent replacement of fine aggregate withLWFA (Hydrocure) on the compressive strength and change in height of the patchmaterial.ADDITIONAL TESTINGRESULTSCHANGE IN HEIGHT - INITIAL READING 0.3103 in.1 DAY 0.3115 in., -0.021% change (shrink.)3 DAYS 0.3118 in., -0.026% change (shrink.)7 DAYS 0.3113 in., -0.018% change (shrink.)COMPRESSIVE STRENGTH - 1 DAY 3620 psi3 DAYS 6440 psiNOTE: Although this additional testing was conducted too late in the testing process toinclude this sample in Phase II testing, the patch material mixed with a higherproportion of LWFA showed promising results. This patch material exhibited lessshrinkage than the control in the change in height test and the replacement of 50 percentof the sand had very little impact on the compressive strength of the patch material(compared to the compressive strength of the Mn/DOT 3U18 control).81