超大粒径骨料机制砂自密实混凝土构件性能

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1、第19卷第3期建筑材料学报V01．19．No．32016年6月JOURNALOFBUILDINGMATERIALSJun．，2016文章编号：1007—9629(2016)03—0550—06超大粒径骨料机制砂自密实混凝土构件性能蒋正武，袁政成，钱辰(同济大学先进土木工程材料教育部重点实验室，上海201804)摘要：开展了不同粒径骨料机制砂自密实混凝土构件的性能研究．结果表明：不同粒径骨料机制砂自密实混凝土工作性能良好，其抗压强度及密实度较大．相比普通粒径骨料机制砂自密实混凝土，超大粒径和大粒径骨料机制砂

2、自密实混凝土内部温峰降低18～23℃，温峰出现时间延长4～9h，但是，其构件受弯极限栽荷较低，且所受弯矩越大，超大粒径骨料的尺寸影响效应越明显．超大粒径及大粒径骨料的粒径、堆积程度、分布状态、界面黏结情况是影响机制砂自密实混凝土构件受力性能，尤其是抗弯拉性能的关键因素．关键词：超大粒径骨料；机制砂；自密实混凝土构件；温峰；弯矩中图分类号：TU528．01文献标志码：Adoi：10．39691j．issn．1007—9629．2016．03．023Self-compactingConcreteMembers

3、FilledwithExtralargeSizeAggregatesandManufacturedSandJIANGZhengwu，YUANZhengcheng，QIANChen(KeyLaboratoryofAdvancedCivilEngineeringMaterialsofMinistryofEducation，TongjiUniversity，Shanghai201804，China)Abstract：Thepropertiesofself—compactingconcretemembersadd

4、edwithdifferentsizeaggregatesandmanufacturedsandwerestudied．Theresultindicatesthattheworkabilityofself-compactingconcretepre—paredwithdifferentsizeaggregatesandmanufacturedsandaddedcanmeetthefillingrequirement，thecompressivestrengthandinternalcompactnesso

5、fdifferentmembersarefavorableandcanmeetrelaventre—quirement．Comparedwithmanufacturedsandself-compactingconcretememberincorporatingnormal—sizeaggregate，theinternalmaximumtemperaturepeakofself—compactingconcretemembersaddedwithextra—largesizeandlargesizeagg

6、regatesdecreasesby18—23℃andthetemperaturepeakdelays4—9h．How—ever，theultimateflexuralloadofself-compactingconcretemembersaddedwithextralargesizeandlargesizeaggregatesislow，andthehigherbendingmomentis，themoreobvioussizeeffectoflargesizeaggre—gateis．Thekeyef

7、fectofthefactorsonmechanicalproperties，especiallybendingandtensionresistanceofself—compactingconcretemembersaddedwithdifferentsizeaggregates，arediameter，accumulationde—gree，distributionandinterfacebondingofextralargesizeandlargesizeaggregate．Keywords：extr

8、alargesizeaggregate；manufacturedsand；self—compactingconcretemember；temperaturepeak；bendingmoment随着建筑结构逐渐向高大化方向发展，大体积胶材用量较高，水化热较大，容易导致浇注结构产生自密实混凝土得到了广泛的发展和应用Ⅲ．目前，国温度裂缝．在保证力学性能的前提下，超大粒径内大体积混凝土主要使用二级配骨料混凝土，由于和大粒径骨料机制砂自