Takafumi Noguchi The University of Tokyo, Japan Park Sun-Gyu Yonsei University, Korea

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Mechanical Properties of HPC with Expansive Additive and Shrinkage Reducing Admixture under Simulated Completely-Restrained Condition at Early Age. Takafumi Noguchi The University of Tokyo, Japan Park Sun-Gyu Yonsei University, Korea Ippei Maruyama Hiroshima University, Japan. Background. - PowerPoint PPT Presentation

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<ul><li><p>Mechanical Properties of HPC withExpansive Additive andShrinkage Reducing Admixture under Simulated Completely-Restrained Condition at Early AgeTakafumi NoguchiThe University of Tokyo, JapanPark Sun-GyuYonsei University, KoreaIppei MaruyamaHiroshima University, Japan</p></li><li><p>BackgroundHigh-performance Concrete (Low W/C)Self-desiccationAutogenous ShrinkageUnder Restraint ConditionCrackingInfluence on Durability &amp; AestheticUse ofExpansive AdditionShrinkage Reducing Admixture</p></li><li><p>Objective of StudyBehaviour of Early Age HPC with and withoutExpansive AdditionShrinkage Reducing AdmixtureRestraint Free ConditionShrinkage StrainUnder Restraint ConditionStrain &amp; StressCreep BehaviourControl of Autogenous Shrinkage Cracking </p></li><li><p>Variable Restraint Testing Machine Fresh concrete is cast into the framework of the testing machine.Specimen size is 1500 mm in length and 100 mm x 100 mm in cross sectional areaThe ends of specimen are fixed to the cross-head, which is fixed to the frame, by claws which hold the concrete specimen and are able to exert tensile or compressive force. The load through the specimen is monitored by a load cell with accuracy of 1 N.The longitudinal deformation of concrete specimen is monitored by four LVDTs with accuracy of 0.125 m.Experiment is commenced after the concrete setting.</p></li><li><p>Program Flow of Simulated Completely-Restrained TestCompletely restrained condition is simulated by maintaining the total deformation of the specimen within a threshold, which is defined as the permissible change in the length of the specimen.There are two controlling triggers.One is stress trigger.Another is strain trigger.While repeating this process in VRTM,a completely-restrained condition is achieved andthe stress generated by shrinkage is measured.</p></li><li><p>Mix Proportions of Concrete</p></li><li><p>Experiments Compressive Strength Tensile StrengthModulus of ElasticityFree Autogenous ShrinkageSealed with a polyester film at 20 CStress Development under Simulated Completely-RestraintSealed with a polyester film at 20 CTrigger of stress and strain : 0.01 MPa and 2 x 10-6</p></li><li><p>Mechanical Properties of Concrete</p></li><li><p>Autogenous ShrinkageAutogenous shrinkages of NHC and SHC occurres at a rapid rate in the first few hours and the rate decreased afterward.In EHC, after a few hours expansion is observed.Expansive addition and shrinkage reducing admixture can obviously reduce the autogenous shrinkage of HPC.</p><p>Graph6</p><p>000</p><p>-8.5294117647-29.2448967655-29.4117647059</p><p>-15.5882352941-54.6879569515-56.1764705882</p><p>-30.8823529412-74.8669357197-77.6470588235</p><p>-55.2941176471-88.9044861672-93.8235294118</p><p>-88.5294117647-97.3855062292-105.2941176471</p><p>-129.4117647059-101.772240744-114.4117647059</p><p>-185.5882352941-103.8193835176-120.8823529412</p><p>-280.8823529412-104.4042814529-125.8823529412</p><p>-348.2352941176-103.8193835176-129.1176470588</p><p>-368.8235294118-102.3571386793-132.3529411765</p><p>-376.1764705882-100.3099959057-135.2941176471</p><p>-378.5294117647-97.3855062292-137.9411764706</p><p>-380-92.7063227467-140.2941176471</p><p>-380.5882352941-88.3195882319-143.2352941176</p><p>-380.8823529412-83.0555068141-149.4117647059</p><p>-380.8823529412-79.2536702345-159.1176470588</p><p>-380.8823529412-76.329180558-167.3529411765</p><p>-380.5882352941-74.8669357197-172.3529411765</p><p>-380.5882352941-73.9895888168-174.1176470588</p><p>-381.1764705882-72.8197929461-174.4117647059</p><p>-380.5882352941-72.2348950108-174.4117647059</p><p>-380.8823529412-71.0650991402-174.1176470588</p><p>-380.5882352941-70.1877522372-173.2352941176</p><p>-380.5882352941-69.3104053343-172.6470588235</p><p>-380.5882352941-68.1406094636-172.0588235294</p><p>-380-66.970813593-171.1764705882</p><p>-380-65.8010177224-171.1764705882</p><p>-379.7058823529-64.9236708194-170.8823529412</p><p>-379.7058823529-64.0463239165-170.8823529412</p><p>-379.1176470588-63.1689770135-170.8823529412</p><p>-378.8235294118-62.5840790782-170.5882352941</p><p>-378.8235294118-63.7538749488-171.1764705882</p><p>-379.1176470588-63.1689770135-171.1764705882</p><p>-378.5294117647-61.7067321752-171.4705882353</p><p>-378.2352941176-60.8293852723-171.4705882353</p><p>-378.5294117647-59.9520383693-171.7647058824</p><p>-378.2352941176-59.0746914663-172.3529411765</p><p>-377.9411764706-58.1973445634-172.0588235294</p><p>-377.6470588235-57.3199976604-172.6470588235</p><p>-377.6470588235-57.0275486928-172.3529411765</p><p>-377.3529411765-55.8577528221-172.6470588235</p><p>-377.3529411765-55.5653038545-173.2352941176</p><p>-377.3529411765-54.6879569515-173.8235294118</p><p>-377.0588235294-54.1030590162-173.8235294118</p><p>-377.0588235294-53.5181610809-173.8235294118</p><p>-376.7647058824-53.2257121132-174.4117647059</p><p>-377.0588235294-52.6408141779-174.7058823529</p><p>-377.0588235294-52.3483652103-175</p><p>-376.7647058824-51.763467275-175</p><p>-376.7647058824-51.1785693397-175.5882352941</p><p>-376.7647058824-50.886120372-175.5882352941</p><p>-377.0588235294-50.3012224367-176.1764705882</p><p>-376.7647058824-49.7163245014-176.4705882353</p><p>-376.7647058824-49.7163245014-176.4705882353</p><p>-376.7647058824-48.8389775984-177.0588235294</p><p>-376.7647058824-48.5465286308-177.0588235294</p><p>-377.0588235294-48.2540796631-177.6470588235</p><p>-377.0588235294-47.6691817278-177.9411764706</p><p>-377.0588235294-47.0842837925-177.9411764706</p><p>-377.0588235294-47.0842837925-178.5294117647</p><p>-377.3529411765-46.7918348248-178.5294117647</p><p>-377.3529411765-46.2069368895-179.1176470588</p><p>-377.3529411765-45.9144879219-179.1176470588</p><p>-377.0588235294-45.6220389542-179.7058823529</p><p>-377.3529411765-45.0371410189-180</p><p>-377.3529411765-45.0371410189-180.2941176471</p><p>-377.6470588235-44.4522430836-180.5882352941</p><p>-377.9411764706-44.1597941159-181.7647058824</p><p>-377.9411764706-43.5748961806-182.0588235294</p><p>-377.6470588235-43.282447213-182.3529411765</p><p>-377.6470588235-43.282447213-182.6470588235</p><p>-377.9411764706-42.6975492777-182.6470588235</p><p>-377.9411764706-42.6975492777-182.9411764706</p><p>-377.9411764706-42.1126513423-183.5294117647</p><p>-378.2352941176-42.1126513423-183.8235294118</p><p>-378.5294117647-41.527753407-184.1176470588</p><p>-378.2352941176-41.527753407-184.7058823529</p><p>-378.2352941176-41.527753407-184.7058823529</p><p>-377.6470588235-40.9428554717-185.5882352941</p><p>-377.6470588235-40.9428554717-185.5882352941</p><p>-377.9411764706-40.6504065041-185.8823529412</p><p>-378.5294117647-40.9428554717-186.1764705882</p><p>-378.8235294118-40.6504065041-186.4705882353</p><p>-379.1176470588-40.3579575364-187.0588235294</p><p>-379.1176470588-40.0655085688-187.0588235294</p><p>-379.4117647059-40.0655085688-187.9411764706</p><p>-379.4117647059-39.7730596011-187.9411764706</p><p>-379.4117647059-39.7730596011-188.5294117647</p><p>-379.7058823529-39.4806106334-188.5294117647</p><p>-380-39.4806106334-188.8235294118</p><p>-380-39.1881616658-189.1176470588</p><p>-380.2941176471-39.1881616658-189.4117647059</p><p>-380.2941176471-39.1881616658-189.7058823529</p><p>-380.5882352941-38.6032637305-190</p><p>-380.5882352941-38.6032637305-190.5882352941</p><p>-380.8823529412-38.3108147628-190.8823529412</p><p>-380.8823529412-38.3108147628-190.5882352941</p><p>-381.1764705882-38.6032637305-191.1764705882</p><p>-381.1764705882-38.0183657952-191.7647058824</p><p>-381.1764705882-38.0183657952-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(days)</p><p>Autogenous Shrinkage (x10-6)</p><p>fig</p><p>fig</p><p>21.28906322.31445322.216797</p><p>21.28906322.36328122.314453</p><p>21.38671922.36328122.363281</p><p>21.48437522.36328122.460938</p><p>21.48437522.46093822.558594</p><p>21.58203122.55859422.607422</p><p>21.58203122.50976622.65625</p><p>21.67968822.46093822.753906</p><p>21.72851622.55859422.851563</p><p>21.77734422.55859422.851563</p><p>21.87522.55859423.046875</p><p>21.97265622.60742223.144531</p><p>22.11914122.55859423.144531</p><p>22.16796922.55859423.144531</p><p>22.31445322.55859423.242188</p><p>22.41210922.60742223.242188</p><p>22.55859422.55859423.242188</p><p>22.60742222.55859423.339844</p><p>22.70507822.55859423.291016</p><p>22.80273422.55859423.339844</p><p>22.90039122.60742223.388672</p><p>22.85156322.55859423.388672</p><p>22.90039122.55859423.486328</p><p>23.04687522.50976623.535156</p><p>22.99804722.55859423.583984</p><p>23.04687522.55859423.632813</p><p>23.14453122.55859423.632813</p><p>23.09570322.55859423.535156</p><p>23.04687522.50976623.632813</p><p>23.14453122.60742223.632813</p><p>23.09570322.60742223.730469</p><p>23.14453122.60742223.730469</p><p>23.19335922.70507823.876953</p><p>23.19335922.6562523.876953</p><p>23.14453122.6562523.876953</p><p>23.14453122.80273424.023438</p><p>23.19335922.75390624.023438</p><p>23.04687522.80273423.974609</p><p>23.09570322.80273424.023438</p><p>23.14453122.80273424.023438</p><p>23.14453122.85156324.023438</p><p>23.09570322.90039124.023438</p><p>23.14453122.94921924.072266</p><p>23.04687522.85156324.0234...</p></li></ul>