The long - term property of steel fiber self - stressing concrete is studied . the results indicate that this material has a good long - term stability . the expansive deformation of 5 years is equal to 90 days , which eliminat 研究表明，钢纤维自应力混凝土的长期性能是可以保证的，其五年龄期时的变形与三个月龄期变形相当。
Research results indicate that aggregate gradation extracted from field samples are out of gradation bounds specified in the design file , which can be one of the contributing factors in the development of pavement distress , especially premature failure 研究结果表面沥青混合料的级配超出设计范围可能是影响路面长期性能并呈现早期破坏的原因之一。
In order to solve this problem , improve life period and service level of higher grade highway , long - term pavement performance ( ltpp ) study must be done , environment field is a important part and foundation of ltpp study 高等级公路的早期破坏日益受到人们广泛关注，为了解决这一难题题，提高路面使用寿命和服务水平，开展路面长期性能研究势在必行。
According to the time - stress equivalence principle , the creep compliance vs . time curves at five different stress levels are determined and shifted along logarithmic time axis to get a master compliance curve at a given reference stress level 运用时间应力等效原理，可以由较高应力水平下较短时间的试验数据，通过沿时间轴的平移得到较低应力水平下材料的长期性能。
And the optimal content of materials are : super plasticizer nf 0 . 8 % , fly ash 20 % , ps 20 ~ 30 % , zeolite powder 20 % , sf 5 ~ 8 % ; the negative influence of hill sand powder should be avoided by controlling of powder content and the use of active additive and super 本文通过对配制的山砂高性能混凝土和普通混凝土的拌合物性能、力学性能、长期性能及耐久性能的研究,得到流动性、保水性、粘聚性等性能优良的山砂高性能混凝土。
The pin silicon photodiode made by alice - china group , which has a large area and high performances , is an important part of the photon spectrometer ( pros ) pbwo4 detector read - out system on the alice experiment . the pin diode has a sensitive area of 16x17 mm2 . its leakage current is lower than 5na at room temperature 本工作研制的pin硅光电二极管的灵敏区面积为16x17mm2 ，常温漏电流小于5na ，紫光区量子效率约为83 % ，结电容为110 - 120pf ，以及由pin光电二极管与电荷灵敏前置放大器组成的读出系统的噪声水平在- 25下小于527个等效噪声电荷，并经过了长期性能稳定性的考验
The results showed that the gradation , which designed by volumetric methods , has perfect water - stability and other pavement performance also can meet the demands of expressway . by integrating compaction capacity and pavement performances , the optimal ratio of the structural layer thickness to the maximum particle - size is 2 . 5 . the water resistance of the mixture added amine type anti - stripping agent attenuates severely after long - term aging , but the mixture added hydrated lime not only can improve obviously the capacity of water resistance , but also has perfect long - term pavement performance 研究结果表明，采用体积法设计的级配不仅具有较好的水稳定性而且其它路用性能均满足高速公路面层的要求；综合考虑压实性能及路用性能，提出了沥青路面表面层结构层厚度与混合料最大粒径的合理比例为2 . 5 ；掺有液体胺类抗剥落剂的沥青混合料经长期老化后其抗水损害能力衰减严重，而掺加消石灰的混合料能显著提高其抗水损害能力，且长期性能较好，是一种优良的抗剥落剂。
F - chart is a useful compute program for analysis and design of active and passive solar heating systems . in this article , the program had been improved to estimate the long - term average thermal and economic performance of active solar heating system . the program of f - chart was transformed from dos to windows 首先，对分析太阳能供热系统长期性能的f - chart程序进行了分析和改进，并用vb和fortran混合语言编程，实现了分析程序的可视化，采用数据库技术对大量的气象参数进行管理，为用户提供了一个方便的太阳能供热系统分析软件。
On this base , the paper analyzed influence factors of temperature field of pavement structure , and brought out calculating formulas of the maximal and minimum pavement temperature , the maximal temperature speed , the maximal temperature grads , and so on , all of these can provide theory bases for design of pavement structure and ltpp study 在此基础上，分析了道路结构温度场的影响因素，提出了路面最高、最低温度、最大温度速率、最大温度梯度等计算公式，为路面结构设计、路面长期性能研究提供了理论依据。
In charge of one of major subjects of the national eighth five - year plan , i . e . " study on shotcreting techniques of polyacrylate emulsion cement mortar for impermeability coating of pu ding rcc dam " , the achievement of which has been appraised by the ministry of electric power and evaluated as reaching national leading level . 2 . in charge of the major subject aided by the committee of national natural science funds , " study on durability of high bolumes of fly ash concrete " , the first phase achievement of which has been commended by the committee . 3 . in charge of one of major subjects of the national ninth five - year plan , i . e . " study on high performance concrete in marine engineering , design and construction " . 4 . acting as one of editors - in - chief of " technical specification for abrasion and cavities resistance of concrete in hydraulic structures " , which is issued by the ministry of water resources . 5 . by providing the repairing and strengthening schemes on seepage and cracks of the basement of nanjing lukou international airport , the air traffic opening of the airport was ensured as scheduled . 6 . consulting services on techniques of high performance and abrasion - erosion resistance concrete for three - gorges project , anti - corrosion of reinforced concrete strutures for the ore port of shanghai baoshan iron and steel works , mass fly ash concrete for jiangyin yangtze river bridge and pumping concrete for nanjing yangtze river second bridge 主持国家“八五”攻关项目“普定碾压混凝土坝上游面丙乳砂浆防渗层大面积施工工艺研究” ，成果通过部级鉴定，评价属国内领先水平； 2 .主持国家自然科学基金重大项目“高掺量粉煤灰混凝土的长期性能研究“ ，阶段成果获国家自然科学基金委通报表彰与奖励； 3 .主持国家“九五”攻关项目“海工高性能混凝土成套技术研究” ； 4 .水利部“水工混凝土抗冲磨防空蚀技术规范”的主编之一； 5 .为南京禄口国际机场地下室修漏与裂缝补提出技术方案被采纳并实施，为机场如期通航作出贡献； 6 .为三峡工程抗冲磨高性能混凝土技术、上海宝钢矿石码头钢筋混凝土防腐蚀技术、江阴长江大桥大体积粉煤灰混凝土技术、南京长江二桥泵送混凝土技术等提供咨询建议。
