混凝土设计大赛ppt

混凝土设计大赛——12级材料一班01组小组成员：张三李四王五刘麻子设计原则及基本信息混凝设计土大赛设计原则：混凝土设计目标强度值C35。原材料基本信息：32.5水泥·····················································300元/吨粉煤灰（Ⅱ级灰）·········································130元/吨砂子（中砂）···············································70元/立碎石···························································90元/立外加剂························································4200元/吨水······························································自来水基本数据：设计强度：坍落度：180~220mm；碎石粒径：5~25mm；减水剂：萘磺酸盐系，减水率15~25%，掺和量0.6%~0.8%MPa35,kcuf混凝土配制强度计算混凝土设计大赛混凝土设计强度等级C20C20—C50C50σ/MPa4.05.06.0表1标准差的取值表645.1,0,kcucuffσ取为5.0MPa由表1水灰比计算混凝设计土大赛cebaocuceafffcw,MPafcu23.430,gceCceff,12.1C.5MP32,gcef20.0,53.0ba初始用水量计算混凝设计土大赛拌合物稠度卵石最大粒径（mm）碎石最大粒径（mm）项目指标102031.540162031.540坍落度（mm）10~3019017016015020018517516535~5020018017016021019518517555~7021019018017022020519518575~90215195185175230215205195表2塑性混凝土的用水量（kg/m3）当坍落度大于90mm时，坍落度每增加20mm，用水量增加5kg，此次坍落度为180—220mm，故取200mm，又碎石的最大粒径为25mm,故查表，确定用水量为238.1kg。水泥用量的确定混凝设计土大赛cwwomcom由用水量结合水灰比可得水泥量：59541.0238.1.3kg减水剂用量的确定混凝设计土大赛查《混凝土设计手册》得知：萘系减水剂掺和量为0.6%-0.8%，减水率15%~25%本次减水率取20%，掺和量取0.6%掺入减水剂后水用量mw1=238×0.8=190.5kg/m3水泥用量mc1=mw1/(W/C)=190.5/0.41=464.6kg减水剂用量:595.3×0.6%=3.57kg/m3确定合理砂率混凝设计土大赛水灰比碎石最大粒径/mm162025400.4030-3529-34/27-320.49/32.6-37.6x1~x229.7-34.70.5033-3833-38/30-35表3混凝土砂率选用表内插法求x1~x288.311x88.362x取坍落度200mm，则%6.5%12560-200为了保证拌合时的流动性，取x=34.05最终的砂率为34.05%+5.6%=40%按重量法公式计算：mc1+ms1+mg1+mw1=mcp=2400kgms1/(ms1+mg1)=0.42ms1=698kg，mg1=1046.9kg粉煤灰代替水泥混凝土大赛在不影响强度的前提下，根据搅拌站配合比经验取代20%,超量取代系数1.2粉煤灰质量：mf=mc1×20%×1.2=111.5kg取代后水泥：mc=mc1×80%=371.7kg水用量：mw=mw1=190.5kg计算成本混凝设计土大赛mc1=371.7kgmw1=190.5kgms1=698kgmg1=1046.9kgm外=3.57kgm粉煤灰=111.5kg水泥:371.7×0.3=¥111.5粉煤灰:111.5×0.13=¥14.5砂子:70×698/1580=¥30.9碎石:90×1046.9/1700=¥55.4外加剂:4.2×3.57=¥15.0总计:111.5+14.5+30.9+55.4+15.0=¥227.3感谢观映12级材料一班01组