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| 个人信息 |
| 姓 名： |
郑译员 [编号]:1259 |
性 别： |
女 |
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| 擅长专业： |
机械，电子互联网，电气，法律 |
出生年月： |
1987/7/1 |
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| 民 族： |
汉族 |
所在地区： |
北京 北京 |
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| 文化程度： |
本科 |
所学专业： |
英语翻译 |
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| 毕业时间： |
39994 |
毕业学校： |
四川外语学院成都学院 |
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| 第一外语： |
英语 |
等级水平： |
专八 |
|
|
| 口译等级： |
中级 |
工作经历： |
1 年 |
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| 翻译库信息 |
| 可翻译语种： |
英语 |
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| 目前所在地： |
北京 北京 |
| 可提供服务类型： |
笔译、家教 |
| 每周可提供服务时间： |
兼职笔译，任何时间。
外语家教 周一至周五晚上7：00后，周末全天 |
| 证书信息 |
| 证书名称： |
专业八级 |
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| 获证时间： |
2009/6/1 |
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| 获得分数： |
72 |
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|
| 工作经历 |
| 工作时期： |
2008/8/1--2009/12/1 |
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| 公司名称： |
中律原咨询（北京）有限公司 |
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| 公司性质： |
外商独资 |
| 所属行业： |
人力资源/行政/后勤 |
| 所在部门： |
行政 |
|
| 职位： |
行政助理 |
| 自我评价： |
热爱工作，热爱生活，积极进取。 |
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| 笔译案例信息 |
| 案例标题： |
工程翻译 |
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| 原文： |
2、透层
透层材料进场前应进行取样检测，根据技术指标要求合格后方可进场。为保证透层油能均匀满布，采用智能洒布施工车进行透层沥青的施工洒布。
技术要求：
选用合适的透层油智能洒布车。透层油在基层养生结束后进行喷洒，确保基层表面干净，浇洒透层油前，须用空压机或森林灭火器将基层表面浮尘吹干净，尽量使基层表面骨料外露，同时基层表面应干燥，基层含水量不得超过3%，以利于透层油渗透及与基层的粘结。为保证洒布的均匀性及洒布量的准确性，必须进行现场试洒、标定。控制好洒布量，施工时应保证洒布车匀速行驶，确保洒布量均匀稳定。经常用铁盘检测洒布量，当用量不符合要求时，及时通过行车速度调整布量。施工时应根据现场温度在0.7～1.2L/㎡的范围内适当调整透层沥青的稠度与用量，渗透深度应大于5㎜。为避免乳化沥青污染基层两侧的构造物，在喷洒透层油时应在构造物上作适当的覆盖或要喷洒管的一侧作适当的遮挡。当气温高且湿度小的情况下进行透层施工时，基层表面过于干燥，喷洒在基层表面上的透层油往往会形成油滴状附于基层表面，不宜扩散和渗透，在基层表面形成均匀的沥青薄膜。洒布中保证车速均匀，不随意变速、转变或急刹车，以免产生漏油，或油量集中，对漏油部位，以人工补油。洒布透层油后进行严格的交通管制，严禁车辆通行，直至透层油全部渗透。
3、封层沥青
本合同段的封层设计采用乳化沥青两油两料层铺法施工，第一层集料规格为S12；第二层集料规格为S14。基层养护期结束后，施工沥青下封层。将基层表面清扫干净，报监理工程师批准后，用沥青洒布车喷洒沥青，接着抛撒第一层石屑，用扫帚将矿料扫匀，达到全面覆盖、厚度一致、集料不重叠，也不露出沥青的要求。局部有缺料时适当找补，集料过多的将多余集料扫出。两幅搭接处，第一幅沥青洒布应暂留100~150mm宽度不洒布石料，待第二幅一起洒布。洒布主集料后，不必等全段洒布完，立即用6~8t钢筒双轮压路机从路边向路中心碾压3～4遍，每次轮迹重叠约300mm。碾压速度开始不宜超过2km/h，以后可适当增加。第二层施工方法和要求与第一层相同，但可以采用8t以上的压路机碾压。
封层沥青采用配有测温范围为0~200℃的温度计的贮油罐加热，沥青温度保持在规定范围之内，用沥青洒布车喷洒，洒布车喷洒不到的部位用手动洒布机喷洒；封层沥青选用慢裂喷洒型道路用乳化石油沥青，沥青喷洒量满足规范要求。
封层施工结束后48小时内，严禁车辆通行，开放交通初期控制车速，时速不得大于30km/h，严禁急刹车，并安排专人养护。
封层沥青应采用沥青洒布车喷洒，在浇洒封层沥青时应注意：
（1）浇洒封层前，路面应清扫干净，对路缘石及人工构造物应适当防护，以防污染；
（2）封层沥青洒布后应不致流淌，渗入基层一定深度，不得在表面形成油膜；
（3）如遇大风或即将降雨时，不得浇洒封层沥青；
（4）气温低于10℃时，不宜浇洒封层沥青；
（5）按设计的沥青用量一次浇洒均匀，当遗漏时，应用人工补洒；、
（6）浇洒封层沥青后，严禁车辆、行人通过；
封层洒布后应尽早铺筑水泥混凝土面层。
4、水泥混凝土
水泥混凝土面板的施工安排在旱季进行，气候对工程施工较为有利。施工所用材料需按计划提前准备，以保证面板施工时的材料供应，保证工期不受影响。混凝土采用混凝土路面摊铺整平机摊铺，严格按经审批的施工配合比进行配料，并注意接缝施工处理，以接缝平滑密实为准则。建立工地实验室，按规定的频率和项目进行试验。路面施工期间实行交通管制工作，路面必须达到设计强度后才能开放交通。
1）、施工准备
施工前做好各种准备工作。分批备好各种材料，并在使用前进行核对、调整，各种材料应符合规定的质量要求；对混凝土路面板下的基层进行强度密实度及几何尺寸等方面的质量检验，基层质量检查项目及其标准应符合基层施工规范要求，基层宽度应比混凝土路面板宽30～35cm或与路基同宽。
2）、测量放线
根据设计图纸恢复路中心线和混凝土路面边线，在中心线上每隔20m设一中桩，同时布设曲线主点桩及纵坡变坡点、路面板胀缝等施工控制点，并在路边设置相应的边桩，重要的中心桩要进行拴桩。第隔100m左右设置一临时水准点，以便复核路面标高。测量放样应经常进行复核，做到勤测、勤核、勤纠偏，确保混凝土路面的平面位置和调和符合设计要求。
3）、混合料拌和及运输
确保混凝土拌和质量的关键是选用质量符合规定的原材料、拌和机技术性能满足要求、拌和时配合比计量准确。拌和设备附有可自动准确计量的供料系统；各种组成材料的计量精度控制在下列范围：水和水泥±1％；粗细集料±2％；外加剂±1％。拌和过程中加入外加剂时，外加剂应单独计量。强制式搅拌机拌和坍落度为1cm～5cm的混凝土拌和物，最佳拌和时间控制为：双卧轴强制式拌和机为60s～90s，最短拌和时间不低于低限，最长拌和时间不超过高限的3倍。
采用自卸汽车运输混凝土拌和物，拌和物坍落度大于5cm时采用搅拌车运输。从开始拌和到浇筑的时间满足下列要求：用自卸汽车运输时，不得超过1h；用搅拌车运输时，不得超过1.5h。若运输时间超过上述时间限制或在夏季浇筑时，拌和过程中加入适量的缓凝剂，尽量缩短混凝土拌和物的运输时间，并采取措施防止水分损失和混合料离析。
4）、混合料摊铺
拌和物运到摊铺现场后，倾卸于摊铺机的卸料机内。正确操作摊铺机完成摊铺振捣作业。浇筑砼路面时,必须严格按照设计要求在板内预埋拉杆(纵缝)、传力杆（施工缝或胀缝），并在振捣时防止钢筋变位，安装传力杆和拉杆时应严格与板的端面垂直，传力杆须用支架固定。砼浇筑至设计标高时，提浆要均匀，浆层不得过厚，并用铁滚筒进一步平整，来禁在表面涂抹砂浆。对振捣密实的混凝土表面进行整平、精光、纹理制作等工序的作业，使其产生得平整、粗糙的表面，确保混凝土路面良好的路用性能。
5）、养生
混凝土表面修整完毕后，进行养生，使混凝土板在开放交通前具备足够的强度和质量。养生期间，须防止混凝土的水分蒸发和风干，以免产生收缩裂缝。计划采用湿治养生。在润湿期用草袋（帘）等，在混凝土终凝后覆盖于板的表面，每天均匀洒水，保持潮湿状态，洒水时不能有水流冲刷；蓄能期内每天对含水材料润湿2～3次；终结期内，必须保证混凝土逐渐失水，与周围环境温度保持平衡。
6）、接缝隙缝处理
混凝土路面的横向缩缝（假缝）应在混凝土达到适当强度（6～12MPa）后及时用锯缝机切割，不得迟误。切缝后尽快采用沥青橡胶类填缝料填缝，填缝时，先清理缝隙，不得有杂物和尘土。
三、沥青砼面层施工
（一）、沥青拌和站安装
1、拌和机设有防止矿粉飞扬散失的密封性能及除尘设备以及检测拌和温度的装置。
2、场地采用水泥砼硬化并设置防雨顶棚，确保矿粉等填料不受潮。各种矿料分别堆放，不混杂。沥青分品种分标号密闭储存。
3、拌和站设有完善的排水设施，排水通畅。
4、拌和站配备试验室，并按规定配置足够的仪器设备。
（二）、沥青混合料配合比试验
沥青混合料的配合比设计，选用符合图纸要求的材料，参考规范及标书提供的配比，用马歇尔试验等方法确定矿料级配及沥青用量。
1.目标配合比设计
1）、确定各矿料的组成比例：分别用各施工段实际使用的矿料进行筛分，用计算机或图解计算各矿料的用量，使合成的矿级配符合规范的要求。本计算反复进行几次，使合成矿料级配曲线基本上与设计要求配比范围中值线相重合，直至满意为止。
2）、确定沥青的最佳油石比：用以上计算确定的矿料组成和规范推荐油石比范围，按0.5%间隔变化，取5个不同的油石比，用实验室的小型拌和机与矿质混合料拌和成沥青混合料，按规定的击实次数成型马歇尔试件，成型温度130度±5度，按部颁标准《公路工程沥青及沥青混合料试验规程》规定的方法，测定试件的密度，并计算空隙率、沥青饱和度、矿料间隙等物理指标进行积组成分析；进行马歇尔试验，测定马歇尔稳定度及流值等物理力学性质。
3）、配合比的确定：以最佳油石比OAC用实验室小型拌和机制备两组沥青混合料马歇尔试件，检验残留稳定度，符合规范规定时，以上目标配合比即可做为生产配合比设计的依据。
2.生产配合比设计
1）、对间歇式拌和机，从二次筛分后选入各热料仓的材料取样进行筛分，以确定各热料仓的材料比例，使矿料合成级配接近规定级配范围的中值，供拌和机控制室使用，同时反复调整冷料仓进料比例以达到供料均衡。
2）、拌和机采用生产配合比进行试拌、铺筑试验段，并用拌和的沥青混合料及路上钻取的芯样进行马歇尔试验检验，由此确定生产用的标准配合比。
3）、拌制试件时采用小型沥青混合产拌和机，以模拟生产实际情况。
4）、每组试件个数统一采用6个；在配合比设计中，人工配制沥青混合料制作试件采用替代法，施工现场采集的沥青混合料试样采用直接制作。
5）、沥青混合料试件密度试验方法：上、中、下面层沥青混合料统一采用水中比重法。试件的配料、拌和均应单个进行，以确保试验结果的一致性。
6）、目标配合比设计的资料(含原材检查资料)连同各种材料的样品，在正式生产混合料前28天报监理工程师审批；生产配合比设计的相关资料在正式生产混合料前14天报监理工程师审批；最后在进行生产验证，以确保沥青混合料的各项技术指标符合规定要求。
3.铺筑沥青砼面层试验段
铺筑试验路段时，再按生产配合比调试后批准的沥青用量拌和沥青混合料及路上钻取的马歇尔试验检验，由此确定生产用的标准配合比，以此配合比作为控制正式大规模生产依据和质量检验的标准。此外，通过试铺段确定现场施工的摊铺工艺。试验段的长度确定为200M，试验路段的铺筑分试拌、试铺与总结三个部分。
1）、通过试拌确定拌合机的上料速度、拌合数量、拌合时间及拌合温度等；验证沥青混合料配合比；提出生产用的集料配合比及沥青用量。
2）、通过试铺确定热拌沥青混合料的摊铺温度、摊铺速度、人工找平方式等操作工艺；确定碾压顺序、碾压温度、碾压速度及碾压遍数等到压实工艺；确定松铺系数和接缝处理方法等；建立用钻孔法及核子密度仪法测定密实度的对比关系，确定压实密度为大面积施工提供标准施工工艺。
3）、确定施工作业效率，制定施工进度计划，全面检查材料质量及施工质量，落实施工组织及管理体系、人员、通信联络及指挥方式等到。
4）、试验段铺筑结束后，提出试验段总结报告，取得监理工程师的批准后即可用以指导大面积的沥青砼施工。
（三）、沥青混合料的生产
1、站内备足5天生产用料，投产后每天补充上1天用料，确保生产不间断。
2、拌和好的混和料应均匀一致、无花白料、无结团成块或严重的粗细料分离现象，不符合要求时混和料不得使用，并应及时调整，所有过度加热、碳化、起泡或含水的混和料及超过正常温度高限30度的沥青混合料坚决废弃。拌和好的沥青混合料不能立即铺筑时，将其放入带保温设备的成品贮料仓储存，储存时间不超过12小时。
3、沥青混合料的生产，每天需由质量检查员及时检验（包括测温、试验抽提检查），并及时出据产品合格证和检验报告单。对拌制的混合料进行质量检查，包括混合料温度的测试和抽样进行马氏试验，并作好检查记录。
4、拌合时根据生产配合比进行配料，严格控制各种材料的用量和拌合温度，确保沥青砼的拌合质量。沥青混合料的出厂温度控制在145-165℃，运输到了现场的温度控制在不得低于140℃，碾压终了温度不低于65℃。
沥青混合料的施工温度（℃）
沥青加热温度 不超过170℃
矿料温度 不超过170℃
混合料出厂温度 正常温度145-165℃
混合料运输到现场温度 不低于120-150℃
摊铺温度 正常施工 不低于120-130℃不超过165℃
低温施工 不低于120-140℃不超过175℃
开始碾
压温度 正常施工 110-140℃
低温施工 120-150℃
碾压终了温度 不低于65℃
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| 译文： |
2. Prime coat
The priming materials should undergo the sampling inspection before the entry into the market which will be available only if the technological standards are qualified. To ensure that the c to be covered evenly, use the intelligent spraying working vehicle to implement the spraying of asphalt of penetrate layer.
Technological requirement:
Choose the suitable layer penetrating oil intelligent spraying car. The layer penetrating oil should be sprayed after the sub grade maintenance to guarantee the base surface clean. Before the spraying, floating dust should be cleaned away on the sub grade surface by the air compressor or the forest extinguisher. Try every effort to make the exposure of aggregates of sub grade surface. And the surface should keep dry and the water content in the base should be less than 3% for the benefit of the penetrating of the layer-penetrating oil and the adhesion to the base. To ensure the evenness of the spraying and the precision of the spraying quantities, the onsite spraying test and calibration should be done. To control the spraying quantity, the car should be driven at an even pace in the construction. Use the iron pan to measure the quantity of spraying. When the quantity doesn’t meet the demands, adjust the speed of the car to change the quantity of spraying. In the construction, adjust the density and use quantity of prime asphalt properly according to the onsite temperature ranged 0.7～1.2L/㎡ with the penetrating depth of more than 5mm. To avoid the pollution to the structure on two sides of sub grades by emulsified asphalt, cover the structure or occlude one side of spray tube in the spraying of layer penetrating oil. When implementing the prime construction with the air temperature high and low humidity, the surface of the sub grade is too dry, the sprayed layer-penetrating oil on the surface of the sub grade usually forms into the oil drop wise boundary to the surface, not good for diffusion and penetrating to form the even asphalt thin films on the surface. During the spray, the car speed should be ensured to be equitable without any speed change, switch or hard brake stop to avoid the leakage or the centralization of the oil. Artificial oil filling is utilized to the oil leakage place. After the spray of layer-penetration oil, the strict traffic control should be implemented to stop the vehicles passing until the full penetration of layer-penetration oil.
3. Seal layers asphalt
The seal layer design of this contract section adopts the two oil and two materials of emulsified asphalt to construct in the way of layer spread. The first layer of aggregates’ standard is S12, and the second S14. After the finishing of base maintenance, the construction asphalt is put under sealed layer. Clean the surface of sub grade and report to the supervision engineer and get the approval. Then spray the asphalt by the asphalt spray car. And then lay the first layer of stone scraps and sweep the mineral aggregates equitably by the broom to reach the acquirements of full co very, even thickness with no overlapping of aggregates and exposure of asphalt. Supplement the partial materials lack age or sweep away the surplus aggregates. At the lap joint of two layers, the first asphalt spray should temporarily keep the width of 100~150mm not to be sprayed by the stone materials but to be sprayed with the second layer together. After the spray of the main aggregates, utilize the double wheels roller with steel barrel of 6~8 tons to roll 3～4 times from the road side to the center with every wheel track lapped by 300mm. The beginning rolling speed should not exceed 2km/h with proper increase in the speed later. The second layer construction is similar to the first, but the roller of more than 8t can be utilized. The seal layer asphalt is heated by the oil stocking can with the thermometer of 0~200℃ and the temperature of the asphalt should keep in a certain range. Use the asphalt spray car to spray and use the artificially spray car when the spray car can’t reach some areas. The seal layer asphalt adopted in the slow breaking spray type road should be emulsified petroleum asphalt with the standard required spray quantity.
After 48 hours of finishing the seal layer construction, the traffics should be forbidden and the driving speed should be controlled at the beginning of traffic passing with less than 30km/h. Hard brake is strictly prohibited and the specialized persons should be arranged to maintain the road.
The seal layer asphalt should adopt the asphalt spray car and some points needed to be noticed when spraying the seal layer asphalt.
(1) Before the spraying, the road surface should be cleaned up. Protect the curbs and the artificial structure properly from pollution.
(2) The seal layer asphalt should not stream after the spray and should penetrate into some depth without the oil film formed on the surface.
(3) Don’t spray the seal layer asphalt when there is a storm or rain.
(4) Don’t spray when the temperature is below 10℃.
(5) Spray evenly for one time according to the designed asphalt quantity. When an omission occurs, manmade spray should be uses.
(6) After the seal layer asphalt being sprayed, the traffic should be controlled and no foot passengers allowed.
The cement concrete layer should be laid early after the seal layer spray.
4. Cement concrete
The construction of cement concrete panel should be arranged to begin at the dry season with the beneficial climate to the engineering. The materials used in the construction should be prepared in advance according to the plan to ensure the materials supply in the panel construction and no effects to the construction period. The concrete adopts concrete road surface and leveling machine paving strictly proportioned according to the approved construction proportion with the notice of joint construction disposal with the standard of the smooth and compact. To establish the building site laboratory, the experiment should be undergone according to the stipulated frequency and projects. During the road surface construction period, the traffic control is operated and it will be opened only in case of the road surface reaching the designed intensity.
1) Construction preparation
Get prepared before the construction. Prepare the different materials separately and check and adjust before the utilization. Each material should be qualified in line with the stipulation. To the quality inspection of the strength and compactness and the geometry size of the base under the concrete road surface panel， the base quality inspection project and its standard should be in line with base construction stipulations requirements. The base width should be 30～35cm wider than the concrete road surface panel or the same width with road foundation.
2) Surveying and setting out
According to the design drawing, recover the road center line and concrete road side line. Set up a middle stake every 20 miles on the center line and set several construction control points of the curve main point stakes, longitudinal slope changing points and plate expansion joints. Set up the relative side stakes on the road side and the important central stakes should be tied up. Within around 100m, set up an interim leveling point in the convenience of reviewing the road surface elevation height. Review frequently when measuring the layout with industrious measurements, checking and rectifying to ensure the plane position and adjust to meet the design demand.
3) Mixture mixing and transportation
The essential key of ensuring the concrete mixing quality is to choose the qualified original materials, mixing machines with the nature that meets the demands and correct mixing time measurements. The mixing equipments should be facilitated with the materials supplement system which can automatically precisely measure. The measurement preciseness of varieties of composed materials should be ranged as water with cement (±1％), rough and fine aggregates (±2％), admixture (1％). When adding some admixture to the mixing process, the admixture should be measured individually. The concrete mixtures with the mixing slump of the forced action mixer is 1cm～5cm, the best mixing time should be controlled as 60 seconds to 90 seconds for the double horizontal shafts forced mixer, the shortest mixing time no less than the lowest limitation and the longest no more than three times of the highest limitation.
When the slump of the mixtures is more than 5cm, adopt the mixer to transport if utilizing the dump tractor to transport concrete mixtures. The time from the initiative mixing to concreting should meet the requirements below: if using the dump tractor to transport, the time should be not more than 1 hour, if the mixer, not more than 1.5 hours. If the transporting time exceeds the time limitation above or concreting in summer, some retarder should be added in the mixing process to reduce the transportation time of the concrete mixtures as large and adopt some measures to avoid the lost of water and the mixture segregation.
4) Mixture paving
After being transported to the site, the mixtures are dumped into the unloading machine of the pavers. Correctly operate the pavers to finish the paving and vibrating work. When placing the concrete road surface, pre-bury the pull rods (longitudinal joints), dowel bars (construction joints or expansion joints) strictly according to the design demands. And prevent from the steel placement while vibrating. Keep strictly vertical to the end faces of the board while setting up the dowels and pull rods. The dowels should be fixed by the stents. From concreting to elevation design, the mud extracting should be even and the mud level should be not too thick leveled by the steel rolls. Forbid to smear the mortars to the surface. Implement the process of leveling, surfacing, texture extraction to the surfaces of the vibrating concrete to make it level and rough to ensure good pavement performances of the concrete road surface.
5) Maintenance
After the dressing of the surface is maintenance to make the concrete board with enough intensity and quality before the opening of the traffic. During the maintenance, prevent the water of the concrete from air drying and evaporation to avoid the shrinkage crack. Plan to adopt heat curing maintenance. During the period of wetting, use the rush bags (matting) etc. to cover the surface of the board after the concrete final setting. Spray the water evenly and keep it wet without the current scours and wet the hydrous materials 2 to 3 times per day during the energy storage period. During the final setting period, ensure the concrete gradually lose water to keep balance with surrounded environment and temperature.
6) Jointing and slot entry disposal
The transverse contraction joints (false joints) of the concrete road surface should be cut by the concrete saw immediately after the concrete reaching the proper intensity of 6~12Mpa without any delay. After the cutting, use kinds of joint fillers of asphalt rubber materials to fill the joints. During this stage, clean the joints firstly and ensure no dusts or miscellanies.
Ⅲ Asphalt concrete surface construction
ⅰ Asphalt mix plant installation
1. The mixers have the function of compacting preventing the mineral powders dispersion and lost and dust colleting equipments and inspection facilities of mixing temperature.
2. The site uses the cement concrete hardening and set up the rain-preventing top roof to ensure the mineral powders etc. not to be wetted. Varieties of minerals should be piled up respectively and not commingled. The asphalts should be stored and labeled according to the kinds.
3. The mixing station has the improved drainage facilities with unblocked drainage.
4. The mixing station equipped with laboratory and enough instruments and facilities according to the stipulations.
ⅱ Asphalt mixture proportion design experiment
The design of asphalt mixture proportion should choose the materials meeting the drawings requirements and refer to the standards and the provided proportion of bid documents. Use the methods of Marshall Test etc. to decide the mineral aggregate gradation and asphalt content.
1. Target proportion design
1) Define the composition proportion of varies mineral aggregates: screen by the practically used mineral aggregates of each construction section separately. Utilize the computer or graphics to calculate the amount of varies mineral aggregates to make the synthesized mineral gradation in line with the requirements of stipulations. The calculation should undergo several times repeatedly to make the synthesized mineral materials gradation curve basically overlap with the designing required proportion median line till to the satisfaction.
2) Define the best ratio of asphalt-aggregate: recommend the ratio range by the defined mineral aggregates composition through the calculation above. The range will be changed intervallic by 0.5%. Extract 5 different ratios. Use the laboratory mini-mixer and mineral mixture to mix into asphalt mixture. Then mould it into Marshall Specimens with stipulated number of hammer and temperature of 130℃ plus or minus 5℃. According to stipulations of the ministry standards of Highway Project Asphalt and Asphalt Mixture Testing Rule, test the density of the specimens and calculate the physical indexes of void age, asphalt saturation and void of mineral aggregates to progress the integral composition analysis. Implement the Marshal Test and measure physical and mechanical properties such as the Marshall stability and flow value etc..
3) Definition of proportion: prepare two sets of asphalt mixture Marshall Specimens by the best ratio OAC and laboratory mini mixer and inspect the stability of residues. If fit for the stipulations, the target ratio above can become the basis of producing ratios design.
2. Production mix design
1) To the interval mixer, screen and sample the materials from the materials secondly screened and chosen into various hot material storehouses to define the material proportion of different hot material storehouses so as to make the mineral aggregates gradation near to the medium value of stipulated gradations, which will be supplied to be used by the mixer control office and repeatedly adjust material entry ratio of the cold silo to reach the balance of the material supply.
2) The mixer adopts the production ratio to conduct the trial mix and pave the experimental section and use the mixed asphalt aggregates and the core samples drilled from the road to conduct the Marshall Test inspection to define the standard ratio for production use.
3) When mixing the specimens, adopt mini-asphalt mixer to stimulate to produce the actual conditions.
4) Every group of specimens is uniformly composed of 6. In the mix design, the substitution method is used by the men to prepare the asphalt aggregates to make the specimens while adopt the direct making for the acquired asphalt mixture sample on the construction site.
5) The experiment method of the asphalt mixture specimens’ density: the upper, middle, and the lower layer asphalt mixture uniformly adopt the underwater proportion method. The mixture and the proportion of the specimens should be conducted individually to ensure the consistence of the experimental results.
6) The materials of the target mix design (including the original materials inspection materials) with various materials samples should be examined and approved by the supervision engineer 28 days before the formal production of mixtures. The relative production mix design materials should be examined and approved by the supervision engineer 14 days before the formal production of mixtures. The last stage is practical validation to ensure the various technological indexes of asphalt mixtures in consistence with stipulated requirements.
3. Pave the experimental section of asphalt concrete layer
1) Define feeding speed, mix number, time and temperature through the trial mix. Verify the ratio of asphalt mixtures and raise the asphalt amount and the aggregates mix ratio for production.
2) Confirm the operation arts of paving temperature, speed, artificial leveling method through the trial paving and confirm compaction arts of the rolling order, temperature, speed and times, etc.. Confirm the loose paving coefficients and joint disposal, establish to use the method of hole-drilling method and nucleon density instrument method to measure the comparison relations of compactness and confirm the compacting density to provide standard construction arts for the large area of construction.
3) Confirm the efficiency of the construction work , regulate the plan of construction, fully check the materials quality and construction quality and carry out the construction organization and management system, personnel, contacts and command modes, etc..
4) After the pavement of the experimental section, raise the collusion report of it and get the approval of supervision engineer. Then a large area of asphalt concrete construction can be conducted and instructed by the report.
ⅲ Asphalt mixture production
1. 5 days’ production materials should be kept in the plant. During the production, 1 day’s materials should be supplied every day to ensure the continuous production.
2. The mixed aggregates should be even without the directing modes, blocks or serious segregation of rough and fine aggregates. The mixtures that can’t meet the requirements should not be used and should be adjusted immediately. All the overheated, carbonized, blistered or hydrous asphalt mixture and the mixtures those exceed the highest temperature limitation of 30℃ should be wasted away. When the mixed asphalt can’t be used to pave, please store it into the finished products storehouse with temperature-keeping equipments less than 12 hours.
3. The production of asphalt mixture should be checked promptly by the quality inspectors every day (including temperature testing, experimental extraction inspection) and surrender the product qualification certificate and inspection report in time. The quality inspection should be applied to the mixed aggregates, including the temperature testing and sampling to conduct the Marshall Test and keeping good inspection records.
4． Mix according to production mix ratio, strictly control various materials amount and mixing temperature and ensure the mixing quality of asphalt concrete. The factory temperature of the asphalt mixture should be limited in the range of 145-165℃. And the lowest temperature of it transported to the site should be 140℃ and the final rolling temperature 65℃.
The Construction Temperature of Asphalt Mixture (℃)
Asphalt heating temperature lower than 170℃
Mineral materials temperature lower than 170℃
Factory temperature of mixture normal temperature of 145-165℃
Temperature of mixture transported to the site higher than 120-150℃
Paving temperature Normal construction higher than 120-130℃ and lower than 165℃
Low temperature construction higher than 120-140℃ and lower than 175℃
Temperature at the beginning of rolling Normal construction 110-140℃
Low temperature construction 120-150℃
Final rolling temperature higher than 65℃
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