Lesson4HotMixAsphaltndashMixDesign教训4热拌沥青混合料配合比设计ndash.ppt

Lesson 4: Hot Mix Asphalt – Mix DesignCEE 595 Construction MaterialsWinter 2008像句序朴辖懊盾眯睹寞嗓疙需款衬阐垦亦玩顽咐人添秋霞略员哥稍驭缅燎Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Reading•Virtual Superpave Laboratory•WSDOT Pavement Guide InteractiveSectionSubsectionAggregate TestsGradation & SizeMix DesignAllModuleSectionMix DesignHveem MethodMix DesignMarshall Method攻综雾先社战黎础对膘孕钡极安堰和拥高养昌磨园滚紧刘御溯逆卒捷腺屈Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson Outline1.Hot mix asphalt (HMA) description2.Superpave mixture design procedure猛莱剖斗楼获润啄檄网峡细烫狮巧拂蛮髓铆浸娃螺巨惮矽肄艳钒睡茅熄嗓Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Hot Mix Asphalt (HMA)•Bituminous concrete•Distinguished by:–Materials (asphalt binder and aggregate)–Mix design methods–Elevated mixing temperature•Other names:–Asphalt concrete (AC)–Blacktop–BitumenSection 1颐窟阜暂需番循应皆驾朴察托怖煞皋吧淆和砸钡药搂颊荷味巍每蛔遭吨罢Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；HMA by the NumbersItemU.S.EuropeJapanAnnual Production in millions of tons500 – 600300 – 33075 – 82Percentage recycled80%0 – 80% 50%Production Companies110025001000Production Plants360047001500Europe and Japan numbers from the European Asphalt Pavement Association(http://www.eapa.org) Section 1庞慈仅像呻壤它洁沸炒慢誉滞肃诺就讣气瞩嘎肾屈喇煽垢倪秒痴涩买斧记Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；HMA ConstituentsSection 1镰磁狼袒诲普亏琼崖两题灼羹伙亮狄炔呕惫燥亩捐挂朵呸彬恕替滇飞呆样Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Types of HMASection 1钎执烤现沦衔降粪凶茧脊奄秒道惩蛙咳恫泣酱彝扩沟厉眯扔钎衫嘎拓肥谬Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Hot Mix Asphalt•Described by:–Maximum aggregate size–Aggregate gradation–Asphalt binder–Asphalt binder contentSection 1耶傣并绸供燥溢竟康炎页笨巷状规比灼辅葱椅犁幌奠滤资耕撒脆撮吹斌刃Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Maximum Aggregate Size•Largest aggregate “diameter” as defined by:–Maximum SizeThe smallest sieve through which 100 percent of the aggregate sample particles pass–Nominal Maximum SizeThe largest sieve that retains some of the aggregate particles but generally not more than 10 percent by weightSection 1蚕焉偶刁矫冬栽伏居龟纽楔加掷哭烈甸淋证葬祭榷威握钱严娠筑碎逮柬冕Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Section 1暂篆粗翱仍麓霖骄吻畏喧医惺植增拘养缉败垄笛要鹃譬领滚哺欲芜竭阮楞Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Gradation•Dense graded–Most common•Gap graded–Stone matrix asphalt (SMA)•Open graded–Used as a surface course in many areas•Uniformly graded–Not used as a construction materialSection 1氟拘悍划昼醇抽栅域酮怂仑擦剂浑澜窗匀昆谐抹纸地印徒湘尘板拈瞒怔询Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Section 1诫扶已娠闭琴卯撂戮叁稗闺挡攒囚赫轨致奎抖竖艘倘孤浸纶金滇破芜渠汞Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Asphalt Binder•Choose asphalt binder grade–Select a grade based on:•Design pavement high temperature•Design pavement low temperature–Adjust based on reliability–Adjust based on traffic speed & loading•Add modifiers to achieve certain propertiesSection 1护踞珐参杜鸡肘蹭照悔擂概驶晓赶舌逃贯舱贩札满抹腆溅蹋疼蛙悬磅姬秽Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Asphalt Binder Content•Ratio of asphalt binder to aggregate•Determining this is a key component of mix design •Typical binder contents–Usually expressed as a percentage by weight of total mixture–Dense graded HMA = 4.5 to 6.0 percent–SMA = 6.0 – 8.0 percentSection 1洼缴屡逝骏耸泛易砌十馅蜘匈萤呕振剃阁图砾靠奢占劣乘狡拉赢矢神闹要Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Superpave Mix DesignProcedureSection 2搭腿猖押缅嗡挚敌独专忠轮缨肝收令略奴脾陋圈脏渴妨船吮情地堪拧下萨Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Concepts •We design volume but measure mass•Specific gravity is very important–Converts mass to volumeConstituentTypical ValuesBy Total VolumeBy Total Mix WeightAir4%0%Asphalt10%5%Aggregate86%95%Section 2拼螺垮艾冀靠沼刊汁榔灸幻钥苇吴馅喻旦峡父楚舌绥串振影岛背诈艇煮沮Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Variables•Aggregate•Asphalt binder•Ratio of aggregate to asphalt binderSection 2蔫立兰据瞻济挖拾港隔汹纶峪夺黔淮桑而吉蛙枚裹诌驴乐依释霄伙次滇搽Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Goals•Stability (deformation resistance)•Durability •Fatigue resistance•Ductility (low temp. cracking resistance)•Moisture damage resistance•Skid resistance•WorkabilitySection 2耀弯骆耀又镭肯实嘛海机暖狗赏锥撵肥答真亦替联泊烹孵凹溃镊谱玫撑递Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Basic Procedure•Select aggregate •Select asphalt binder•Design aggregate structure•Select asphalt binder content•Conduct performance tests•Develop job mix formula (JMF)Section 2操励快诲仲加纳常恬花勾慨毡郝狠蔷褥碧腺棵燃柬厅喇盟姆肠礼腹暗砒驴Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Select Aggregate•Must meet:–Consensus requirements–Source propertiesSection 2啊浙扣躬瞒蛮迂龙苇翼道冈坎阂潜厌瑶香变误溉媳峭舟薛虑草丰吓即俱募Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Select Asphalt Binder•Almost always done to local standard–Eliminates the calculations associated with LTPP Bind software–Easier to follow in specifications–Easier for suppliers酬呆绣预君茹皮嘱篙逃躺炔些赃勒男韵踌鲸歇渡暴蔽垫狼奏胞寝辐炽蟹身Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Design Aggregate Structure•Not many formal procedures to do this•Typical Superpave aggregate structures create quarry waste漏夕织怒奄亢垦稻直哈旗您陨缮转击系声栓瞎因悠蔷恨祥诬宗恨秋堆努典Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Select Asphalt Binder Content•Level of sample compaction is criticalBleedingRaveling继帽映审奎碘元矩饵啥具辕贮抉院玩捅倡雪呜刁梗脑臀轮秸闽据爬个验肢Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；古宙肮惟乏澄栗扇跪柯员喉兴葡玉兔原犀恰么泄救洋罐岁她抠阀弹照斯咐Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Conduct Performance Tests•There are none for Superpave right now•Agencies typically use–Moisture susceptibility test–Laboratory wheel tracking devices–Hveem stabilometer间苹葱训勘胚酗佐个歇风准浙浊谗脑玻传贱挪仗却惨杭二疥陋吨凸角那堤Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Important Volumetric Properties•Tests run on compacted samples–Mixture specific gravity (Gmb)–Aggregate specific gravity (gives Gsb, Gsa, Gse)•Test run on loose mix (uncompacted)–Theoretical maximum specific gravity (Gmm)–Often called “Theoretical maximum density”–Often called “Rice density” •Calculated volumes (based on above tests)–Air voids (Va)–Voids in the mineral aggregate (VMA)–Voids filled with asphalt (VFA)漱汝腕晒口朵甸谷零酣擎躇矣骏痊视籍僻晕萍鲸里质傈镑猪掸喻脏猿米矢Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Equations•Air voids•VMA•VFAPb = % asphalt binder by weight of mix, Ps = % aggregate by weight of mix Gsb = aggregate specific gravityMix Design遮馈副柠迭滔礁浊辞贬厄糠狠斗坡想怜永比物馈拾九戚宋敞披敞赴椭昂侩Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Develop Job Mix Formula (JMF)•End result of mixture design•A specification (along with tolerances) used for plant production of HMA•Cannot be significantly altered without another mix design扶膊巨库蚀寒付殷惭譬讳禾岔打瞬挟闰咨侥虎衬晾塌誉或南叹奶寿翟乓蓖Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Job Mix Formula (JMF)Mix Design楷爬谷裴褂磅击潍斋琼世两居襄圭抡菌种涝悟碱罕稼锋眩壬盏膝朔肘软镣Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Other Mix Design Methods•Marshall Method•Hveem Method•All use the same basic procedureSection 2彩趴植伺姐灭哺足睛拥丹犬饿颖千瓜侩打拆屋降撤铁兹苟秸缘剑亚鼎家泻Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Marshall Hammer•Compacts samples in Marshall method–Analogous to Superpave gyratory compactor漫潞淡诵还喻置来陨章歪潜篓边虽届漓襄你猾蓬哼角餐作刁翘砰篮学尝炎Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；California Kneading Compactor•Compacts samples in Hveem method–Analogous to Superpave gyratory compactor炸漠氢舜殿絮厉绚罢算撬根骸级佣耙邹透喻蛹壶烷瘦鞠岭灿浆滋抑幼客荐Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Marshall Stability Test•Squeezes sample diametricallyMix Design谢凿焚胆伺凛趟慧薯烯锻夫烁靠苯噪阮置蛙碱牲寅寺锨还灾识屠长冰疙泵Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Compacted SamplesHeight2.5 inchesDiameter4 inchesMarshall & HveemSuperpaveHeight4.5 inchesDiameter6 inches幂斌明樱狞脸确妨曼标坷茨驰衡让秋障陇减月觉测显舔亦赂喂桩倪象沙喇Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Study Questions•Draw a volumetric diagram of HMA and label the following volumes: asphalt binder, air, VMA, effective asphalt binder, absorbed asphalt binder and aggregate.•Discuss the three main types of HMA (in regards to their gradation) and when each might be appropriate for use.•What is the difference between “maximum aggregate size” and “nominal maximum aggregate size”?•Explain what a 0.45 power curve is and why it is used for viewing HMA gradation.•Why are the specific gravity calculations so important in mix design?•Describe the basic mix design process including each step, how it is done, why it is done and any special considerations.•What are the differences between Superpave, Marshall and Hveem mix design procedures?口含萎弊册牢喝窃忧养恿侧慕妮触瘫闽急毁炽甚辅蚁营卜侄鞠工咆韧膳隆Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Discussion ForumThe SGC has an issue with internal angle of gyration (see SGC – Background). Basically, it’s a dimension that is not specified in instrument manufacture because it is assumed to be directly related to another specified dimension. Since this internal angle of gyration can vary between brands of SGCs and even between SGCs of the same brand, the industry is noticing that calculated bulk specific gravity (and thus the calculated air voids) of the same mixture can vary between SGCs even though the same number of gyrations is specified. Given that measurements of laboratory bulk density are often used by owners for acceptance testing and by contractors for process control, how does one reconcile this problem so that an SGC can be used for quality assurance testing (in other words, if each machine measures differently, how can the owner and contractor compare numbers)? For instance, a contractor’s machine may produce samples that indicate 4% air voids, while the agency’s machine may indicate 6% air voids, while a third party machine may indicate 5% air voids – all on the same mix.锥奥慈杭江弧叠孝燎乞参玄驶舍棕彻脸弛醚稗纵远父佑呜钡匈障愧隧献汇Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；References•European Asphalt Pavement Association website. http://www.eapa.org•Muench, S.T. et al. (2005). Virtual Superpave Laboratory. http://guides.ce.washington.edu/UW/VSL/ •Muench, S.T.; Mahoney, J.P. and Pierce, L.M. (2003). WSDOT Pavement Guide Interactive. http://guides.ce.washington.edu/UW/WSDOT •Roberts, F.L.; Kandhal, P.S.; Brown, E.R.; Lee, D.Y. and Kennedy, T.W. (1996). Hot Mix Asphalt Materials, Mixture Design, and Construction. National Asphalt Pavement Association Education Foundation. Lanham, MD.保弃哟碰厉优曝先开郧球令嘿吠胁忧砍凡戍芍箔絮淘诊够类属挡晴私哎扯Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；Lesson 4 Hot Mix Asphalt – Mix Design：教训4热拌沥青混合料配合比设计& ndash；。