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高强混凝土配合比确定方法的探讨(转帖) [复制链接]

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高强混凝土配合比确定方法的探讨(转帖)¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

砼随着材料的开发及应用,砼组成材料由普通砼的水泥、砂、石、水四种发展为5~7种组成材料,使影响砼强度及工作性等的因素变得更复杂,这就为砼配合比的确定提出了新的要求.配合比的确定,关键是要保证砼满足施工、强度、耐久性、经济性四方面要求.在现行配合比设计规程JGJ/T55-96中,高强砼配合比确定方法基本上还采用普通砼的确定方法.但在实践中,该方法已显不足.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
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1 现行的高强砼配合比确定方法¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  高强砼配合比的确定现在基本是应用普通砼的确定方法.该方法是利用鲍罗公式及表格按强度及耐久性要求确定水灰比 ;按粘聚性要求确定砂率Sp;按流动性要求确定单位用水量W0;按经验确定外加剂掺量及掺合料用量;按以上确定参数计算初步配合比;然后进行试拌,按工作性好坏,对Sp、W0及外加剂等作适当调节;最后利用 ~f的线性关系进行强度调节确定配合比.这方法以其简单易行一直被人们所应用[2].¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
2 在普通砼及高强砼中,用料及配合比关键参数对性能的影响的差别[1~3]¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
2.1
 水灰比 ¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  1)在原材料一定的条件下,在普通砼中, 对强度起决定性作用.因此,在确定 时,除考虑耐久性外,主要由强度确定;而在高强砼中,除 外,骨料含量、砂率、单位用水量等对强度也影响较为显著.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  2)在普通砼中,灰水比 与砼强度f的关系为线性关系,在进行砼试配时,正是利用了此关系进行强度调整;而在高强砼中,当 较小时, ~f的线性关系反常.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
2.2 砂率Sp的影响¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  在普通砼中,Sp对强度影响很少,对粘聚性影响十分显著,随着Sp增大,粘聚性变好.因此,在确定砼配合比时,没有考虑Sp对强度的影响,只是按施工操作要求的粘聚性确定Sp.在高强砼中,Sp对砼强度影响较大,试验表明,Sp减少,强度增加,Sp每减少1%,强度约增加1%;而Sp对粘聚性影响较小,原因是高强砼的 较小,水泥用量大,且掺入大量的掺合料.本身粘聚性很好.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
2.3 骨料含量的影响¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  骨料含量对普通砼强度影响很小,而对高强砼影响较为显著,影响程度仅次于 .试验表明, 每减少0.01,强度增加3.5%~5%, 愈小,强度增长率越大.而 对强度的影响程度为 每减0.02,强度增加6.5%~9%.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
2.4 单位用水量W0影响¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  普通砼中,当流动性一定时,用水量基本恒定,且当 一定时,用水量W0对强度影响甚少,因此,需水量主要按施工要求流动性确定;而在高强砼中,用水量的大小对强度影响较为显著,当 一定时,W0愈少,强度愈高.试验表明,其影响程度与骨料含量对强度影响一致,当每m3砼减少5 kg水时,强度增加3.5%~5%.但是,W0受到外加剂的种类及掺量、混合料的种类及掺量、坍落度损失要求制约.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
2.5 外加剂的种类及用量的影响¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  在高性能砼中,一般都加有外加剂.常加的有高效减水剂和缓凝剂.减水剂主要用来提高砼流动性,其掺量的大小与减水剂种类、投放时间、水灰比、水泥与骨料种类、数量及环境温度等因素有关,很难予先确定准确的掺量.太小,减水效果不显著;太多,超过减水剂饱和点,不但流动性不再增加,砼还会产生离析,影响砼质量,同时还增加成本.缓凝剂也有类似情况,掺量适中,有利于减少坍落度损失,保证砼的泵送性能;掺量太小,作用不大;太多,凝结时间过长,影响后续施工操作,同时会使砼长时间疏松不硬,强度严重下降.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  此外,水泥品种,掺合料的种类及掺量、骨料品种等对砼强度及工作性都有一定的影响.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
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3 普通砼配合比确定方法在高强砼中应用已显不足¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  从以上论述可见,由于材料品种繁多,性能各异,配合比中各参数对砼性能影响复杂.因此,高强砼中的各材料用量及各参数的取值很难象普通砼一样,予先确定一个具体值.因此,普通砼配合比确定方法在高强砼中应用已显不足.主要有以下几方面:¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  1)只考虑 对强度的影响,忽略其它参数或材料品种对强度的影响,得出的配比不经济.试验表明,同时考虑 、Sp、W0及骨料含量对强度的影响进行配制砼,可显著提高砼强度及节约水泥,节约水泥12%~20%.;¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  2)利用 ~f的线性关系进行强度调整,当 较小时,得出的配比不准确;¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  3)较难把砼强度,耐久性、工作性及经济性统一起来.在配合比设计时,虽然其也考虑这些内容,但它是孤立地考虑的,因而得出的配比不够合理;¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  4)未有考虑各材料的特性及各材料之间的相互影响;¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  5)较难适应多项要求的砼.如若同时要求砼满足强度、抗渗标号、坍落度、坍落度损失值、弹性模量及成本等目标,这种方法就显得无能为力.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
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4 应用“正交—综合评定法”确定高强砼配合比¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
4.1
 正交—综合评定法:该方法是利用正交试验的原理按排试验,根据试验结果进行综合评定,找出满足各项工程要求的最佳配合比的方法.步骤及方法见4.3实例.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
4.2 正交—综合评定法优点:¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  1) 在各材料及参数对砼性能的影响还不太清楚的情况下,它能很好地处理各材料、各参数之间的相互关系.它通过科学安排试验,利用其“整齐可比性”及“均衡搭配性”,通过分析试验结果,可得到优化的配合比.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  2) 它能把砼强度、耐久性;工作性及经济性统一;适应多目标要求的砼;所得的配比技术先进,经济合理.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  3) 通过试验数据的分析,可弄清各材料,各参数对砼强度、耐久性、工作性及经济性的影响趋势及其影响的主次关系,为施工管理、质量控制、成本管理提供依据.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
4.3 实 例:¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  某工程,混凝土设计强度等级为C55,C60,采用泵送施工,坍落度要求150~180 mm.材料采用¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
p.o 525水泥,Dm=20 mm碎石,中河砂,FDN高效减水剂掺量为0.5%~1.1%,缓凝剂为糖蜜,掺量为¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
0.1%~0.3%.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  1) 明确试验解决问题及考核指标¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  要解决的问题:提出满足施工要求,强度要求、耐久性要求及经济性要求的配合比.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  考核指标:C55砼强度≥65 MPa,C60砼强度≥69 MPa,入泵坍落度S=150~180 mm,30 min后坍落度≥120 mm,成本愈低愈好.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  2) 挑因素,选水平.选择的因素及因素水平如表1:
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表1 试验因素水平表¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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水平¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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A(水泥用量)¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
(kg/m3)
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B(单位用水量)¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
(kg/m3)
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C(砂 率)¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
(%)
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D(缓凝剂)¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
(%)
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1¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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480¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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170¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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42¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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2¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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510¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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163¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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38¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0.2¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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3¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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540¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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156¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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34¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0.3¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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3)选择正交表:由于有4个因素,3种水平,故选择L9(34)正交表.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  4) 试验安排:根据已选定的因素、因素水平及正交表,试验安排如表2.
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表2 试验方案及结果表¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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试验号¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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因素¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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试验结果¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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A¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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B¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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C¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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D¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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FDN¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
(%)
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S¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
(mm)
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△S¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
(mm)
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f¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
(MPa)
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成本W¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
(元/m3)
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综合¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
评分
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名次¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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1¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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480¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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170¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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42¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0.55¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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180¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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45¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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58.4¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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326.2¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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/¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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2¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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510¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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163¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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42¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0.2¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0.75¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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180¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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50¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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63.5¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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355.5¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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15¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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6¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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3¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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540¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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156¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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42¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0.3¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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1.05¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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170¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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55¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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73.6¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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390.6¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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18¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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5¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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4¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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480¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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163¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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38¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0.3¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0.60¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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180¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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45¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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65.8¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

334.4¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

27¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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1¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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5¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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510¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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156¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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38¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0.80¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

180¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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75¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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74.3¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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355.9¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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540¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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170¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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38¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0.2¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0.70¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

170¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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50¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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68.2¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

368.0¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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18¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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4¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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7¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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480¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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156¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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34¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0.2¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0.70¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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180¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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60¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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70.5¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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339.1¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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27¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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2¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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8¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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510¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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170¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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34¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0.55¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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175¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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40¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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66.8¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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346.8¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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24¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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3¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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9¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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540¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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163¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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34¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0.70¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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175¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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80¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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78.0¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

365.6¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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0¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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备注:FDN—高效减水剂;S—坍落度;△S—坍落度损失值;f—抗压强度;W—成本价.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

  5)试拌:按试验安排中各试验号的参数计算试拌用料.试拌时,高效减水剂用量以使流动性S=150~180 mm确定.并把试验结果填于表2.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  6) 试验结果分析¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  ① 确定各因素对砼性能影响趋势及主次¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  各因素、因素水平对砼强度、坍落度损失值、成本影响如表3.表3数据是表2同一因素同一水平结果的平均值.通过对极差进行分析,可得出各因素对以上结果影响的主次,极差愈大,影响愈大.各因素对砼强度影响趋势大小为A>B>C>D,水泥用量、用水量,砂率大小对强度都有较大的影响;对坍落度损失值影响趋势大小为:D>B>A、C.缓凝剂掺量及用水量影响较显著;对成本的影响趋势大小为A>B>C>D,影响最大的为水泥用量.以上分析有利于施工管理,质量管理及成本管理.
¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

表3 极差分析¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

因素¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

强度/MPa¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

坍落度损失值/mm¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

成本/元.m-3¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

1¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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2¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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3¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

极差¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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Δ 1¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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Δ 2¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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Δ 3¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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极差¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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1¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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2¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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3¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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极差¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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A¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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64.9¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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68.2¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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73.3¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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8.37¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

52¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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55¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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62¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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10¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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331.6¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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  ② 确定最佳配合比¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  直观法:在目标数较少或较易判别优劣时可用此法.如本试验,以满足工作性要求,强度要求的条件下,成本低的为优.所以C55,C60配比分别可定为4#,7#试验结果.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  综合评分法:当目标数较多或较难用直观法判别优劣时使用.步骤如下:第一,按各目标重要性程序不同,分别确定分值系数ki.如本试验,确定配比的原则为:在满足施工、强度要求的条件下,尽量节约材料,因此,强度,坍落度损失值、成本的分值系数ki分别取2,1,3.第二:评定各试验各目标得分:首先确定基本得分ai,再求该目标得分ki.ai.评定基本得分的方法为:若目标值不符合设计要求得0分;其余按优劣排列,分别得分为n,n-1…1.也可用跳跃式评分,以便把优劣拉开得分距离.第三:求各试验综合得分:把各试验各目标值得分相加.如7#试验,坍落度损失值、强度、成本的基本得分ai分别为3、5、6.目标值得分为:ai .ki=3×1,5×2,6×3,综合评分为31分.第四步:确定最佳配比:综合得分高为优.然后按综合分高低排名次,当综合分相同时,以最重要目标为优者为优.本试验排次见表二、由表二得C55,C66配比分别为4#及7#试验结果.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
5 结束语¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
  从以上论述可见,用正交综合评分法确定高强砼配合比,可避免试验的盲目性.它特别适合多目标要求的砼,能使砼满足工程各项要求,并取得一定的经济效益. ¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

(责任编辑 张晓云)■¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…

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作者简介:卢进亮(1962-),男,广西玉林人,广西大学土木建筑工程学院高级工程师.¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
作者单位:卢进亮(广西大学土木建筑工程学院,广西 南宁 530004)
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2#

回复:高强混凝土配合比确定方法的探讨(转帖)

很好,多谢分享高强混凝土配合比确定方法¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
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3#

回复:高强混凝土配合比确定方法的探讨(转帖)

很好,谢谢!¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
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回复: 高强混凝土配合比确定方法的探讨(转帖)

谢谢!¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
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5#

回复:高强混凝土配合比确定方法的探讨(转帖)

yaodei¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
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6#

回复:高强混凝土配合比确定方法的探讨(转帖)

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7#

谢.....¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
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9#

回复 1楼2007lkj的帖子¢2az±Þ®"Êbbs.3c3t.com ¶ì­-c1h…
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