对“白加白”改造旧水泥砼路面实施方案的探讨     

何勇兵 《安徽地质》2011,21(3):228-230

G318怀宁段路面改善工程设计方案为旧水泥砼路面加铺水泥砼路面(简称"白加白"),在安庆市公路系统尚属首次实施,在我省亦无成功的实践经验可直接借鉴。为此,安庆市公路局专门成立了科研小组,并与浙江大学合作,以"白加白改造旧水泥砼路面方案的研究"为课题,将G318怀宁段作为实践项目,申报2010年度安徽省交通科技项目。笔者作为小组三位主要成员之一,全过程参与该项目的建设与管理。现就该方案的实践成果进行一次全面系统的总结,并就有关技术问题进行探讨。  相似文献   

水泥浆护壁堵漏若干问题的探讨   总被引：2，自引：0，他引：2  

李粤南 《福建地质》2011,30(3):248-253

水泥浆护壁堵漏是目前钻探施工中广泛应用的技术措施之一。在水泥浆护壁堵漏施工中,因各种原因致堵漏失败,根据水泥浆护壁堵漏失败的原因,从灌注工艺方面探讨提高水泥浆护壁堵漏的效果和预防孔内事故的发生应特别注意的若干问题。  相似文献   

活性MgO定量分析标准方法的比较研究          下载免费PDF全文

董金美  余红发  李颖  乔宏霞  王梅娟 《盐湖研究》2011,19(2):29-33

用WB和JC标准水合法测定轻烧MgO粉的活性MgO含量,对测定结果进行方差和误差分析,并研究了水化时间对测定结果的影响。结果表明,两种方法存在显著性差异,WB和JC水合法的平均相对误差分别为1.31%和-19.85%,WB水合法精密度远高于JC水合法。以WB水合法为基准,JC水合法的平均相对误差大于-20%,远远超过行业标准中规定的±3%。因此,对于镁水泥原料MgO中活性含量的定量分析,不能采用JC方法,必须采用WB方法。此外,发现水化3 h已经接近活性氧化镁的水化平衡,为修订WB标准方法提供了参考依据。  相似文献   

Granite weathering and silcrete formation on the Yilgarn Block,Western Australia     

C. R. M. Butt 《Australian Journal of Earth Sciences》2013,60(4):415-432

Weathering profiles developed on granitic rocks, exposed in the breakaways of the Barr‐Smith Range in the N of the Yilgarn Block of Western Australia, consist of kaolinitic saprolites merging upwards into silcrete, sandstone and grit. The sandstones and silcretes may also form columns or dykes, penetrating downwards into the saprolite. The silcretes are cemented by quartz and anatase, with zircon (QAZ‐cement), and‐the sandstones are cemented by aluminosilicates, either apparently amorphous (as siliceous allophane) or partly crystalline, as kaolinite and opaline silica. Transitional zones between silcretes and sandstones have all cement types. The profiles are characterized by low concentrations of alkalis and alkaline earths and most metals. The QAZ‐silcrete horizons may contain over 3% TiO₂ and 1000 p.p.m. Zr. The profiles evolved through at least four stages: (i) Formation of the deep saprolite‐sand weathering profile by kaolinization of feldspar and mica at depth, and the solution of kaolinite near the top of the profile, causing settling of resistant quartz grains, (ii) Precipitation of QAZ‐cement, the TiO₂ and SiO₂ being derived partly by lateral migration from upslope. (iii) Precipitation of aluminosilicates, in the sandstone and the saprolite. (iv) Erosion and exposure of the profiles by pedimentation. A similar profile occurs further S, at Gabbin, but no QAZ‐silcrete is present and the only exposures are in exploration pits. The kaolinitic saprolite‐quartz sand profiles probably formed under humid conditions, as the equivalents of ferruginous laterite developed on more basic rocks nearby and of lateritic bauxite in the Darling Range. However,’ the sand was a surface horizon and there is no evidence that there was ever a ferruginous zone at these sites. The sequential precipitation of QAZ‐ and aluminosilicate‐cements was probably, a response to increasing aridity and reduced groundwater flow. Aluminosilicate‐cemented materials tend to disaggregrate on exposure but they are probably more abundant than the more prominent QAZ‐silcretes.  相似文献   

MTA固井技术在煤层气井中应用的实验研究     

张文平  王青贵  张素  何吉标  顾军 《中国煤炭地质》2013,(10)

MTA固井技术在油气田中的运用已经取得了显著效果,能够提高二界面的抗剪切强度以及抵抗地层水对二界面的冲蚀。通过室内实验,对MTA固井技术在煤层气井中的运用进行探索。实验结果表明,MTA技术在煤层气井的固井模拟实验中,也能够有效的提高二界面的抗剪切强度,实现二界面的整体固化胶结,抵抗地层水对煤层气二界面的冲蚀,这些特点对于提高煤层气井的产能具有重要意义。作为一种施工简捷、效果显著的固井技术,MTA固井方法在煤层气井中的应用前景是极为广阔的。  相似文献   

复杂地层钻进中可控复合浆液的研制          下载免费PDF全文

段隆臣  郭志军  吴景华  闫丰 《探矿工程》2013,40(2):64-67

复杂地层钻进中常用的注浆材料需要良好的时间可控性和固结体强度,因此研制一种可控时间、增加固结体强度、效果良好的注浆浆液是有意义的。针对以上问题,利用正交试验的方法研制了一种复合注浆材料。在不饱和聚酯中添加水泥及引发剂、促进剂使浆液在要求时间内固化,最终配方的固化时间为62 min,抗压强度为32.6 MPa。该浆液作为化学浆液具有可注性好、浆液粘度低、能注入到细微裂隙中的优点,固结体强度高,并且塑性性能良好,由于在浆液中添加了水泥,降低了成本,较之一些化学浆液有一定的优势。  相似文献   

水泥混凝土路面病害成因分析及处治方法     

钱芳 《安徽地质》2013,(3):224-226

水泥混凝土路面使用寿命的长短,除取决于施工质质量外,在很大程度上取决于养护质量。水泥混凝土路面破损一旦发生．破损状况将迅速发展,对行车的舒适性和道路顺畅造成严重影响,养护难度也相应加大。通过六安境内某段一级公路水泥混凝土路面的病害调查,对其形式和成因进行分析,在公路养护中提出了处治病害的具体措施。  相似文献   

矿渣微细粉掺量对水泥水化产物的影响     

肖万  马鸿文 《岩石矿物学杂志》2013,32(6):882-888

利用X射线衍射、TG-DSC综合热分析以及环境扫描电子显微分析技术等,研究了矿渣微细粉对水泥水化产物钙矾石、Ca(OH)₂、CSH凝胶等的影响规律。研究结果表明,在水化早期,矿渣微细粉即参与水泥水化进程,显著影响水泥水化产物钙矾石、Ca(OH)₂和CSH凝胶等的生成速度和生成量及微观形貌,并且随着其掺量增大及水化时间延长,矿渣微细粉参与水泥水化反应程度逐渐提高。  相似文献   

Study on forward modeling of through-casing resistivity logging     

《中国科学D辑(英文版)》2008,(Z2)

Through-casing resistivity logging (TCRL) is a new kind of logging method for formation evaluation,reservoir monitoring and saturation changes tracking. In this paper,the basic principle of TCRL is de-tailed,and the modified transmission line equation method (MTLEM) is first proposed in China. The MTLEM has been employed to simulate the responses of TCRL,on the basis of which,the effects of formation resistivity,cement and casing on the responses of TCRL are analyzed,and the signals in-duced in different formations are also calculated,which can help the design of TCRL tool and data processing and interpretation in China.  相似文献   

Dating of Late Pleistocene terrace deposits of the River Rhine using Uranium series and luminescence methods: Potential and limitations     

Stphane Kock  Jan D. Kramers  Frank Preusser  Andreas Wetzel 《Quaternary Geochronology》2009,4(5):363-373

Uranium-series dating of pedogenic carbonate crusts from fluvial gravels is tested using Optically Stimulated Luminescence (OSL) ages as references. OSL dating yielded ages of 30–15 ka and 13–11 ka, which correlate with the cold periods of the Last Glacial Maximum and the Younger Dryas. These ages are internally coherent and consistent with the geological background and are thus regarded as reliable. Most of the U/Th results scatter widely in the ²³⁰Th/²³²Th vs. ²³⁴U/²³²Th isochron diagram, making regression unrealistic. Semiquantitative age estimates from the data were found to be mostly older than the OSL ages and the geological context. It is suggested that a heterogeneous initial ²³⁰Th input, not relatable to a detrital component, is responsible for the observed discrepancies. This input may be due to bacterial activities and Th transport on organic colloids. It appears necessary to avoid samples where bacteria could have contributed to carbonate precipitation. Further, the relative importance of this problem decreases with sample age, so that U/Th dating of sinters is expected to be more reliable in the >100 ka age range.  相似文献