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高层结构、核电设施及大规模基础设施建设中大体积混凝土早期温度开裂屡见不鲜,早期温度开裂降低的混凝土结构的承载能力,劣化了混凝土结构耐久性。本文探讨了大体积混凝土温度开裂的成因以及开裂特征,提出了优化配合比设计、调整施工工艺及合理养护等控制大体积混凝土温度开裂的措施。 相似文献
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介绍了太阳能建筑一体化的涵义及优点,论述了太阳能养护混凝土砌块的可行性、原理及养护设施等,分析了太阳能养护混凝土砌块的效果及应用前景。 相似文献
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利用旧建筑物改建成混凝土标准养护室可以节省建设时间和成本。本文通过对 混凝土标准养护室的热交换分析,阐明了养护室保温、隔热的重要性,并介绍了养护室的改 建方法及其附属设施的选择和安装。 相似文献
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随着我国高速铁路建设重心逐步从南向北推进,北方地区尤其是寒冷地区的高速铁路建设规模逐年增大,如何确保在北方寒冷地区常年空气干燥、昼夜温差大、风力大的气候特点下高速铁路桥梁混凝土结构尤其是进行现场施工的桥梁小型混凝土结构养护,正成为研究的一个新方向。文章以大同至张家口高速铁路智家堡御河特大桥桥面附属设施挡砟墙混凝土养护施工为背景,介绍了自动养护系统在北方寒冷地区高速铁路桥面附属设施挡砟墙混凝土养护中的实际应用。 相似文献
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为解决隧道二衬混凝土的养护问题,设计了隧道衬砌专用的蒸汽养护台车,较好地解决隧道衬砌混凝土养护的难题,混凝土蒸气维修机能够有效地缩短维修时间,降低维修费用,减少对环境的干扰。 相似文献
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《建筑砌块与砌块建筑》2009,(6):28-28,30
在预制混凝土制品行业,"哪种养护工艺方法最有利于提升产品质量"一直存有很大争议.国际上针对预制混凝土产品的养护有几种观点,会因产品的不同而变化.迄今为止,还没有一种具有综合养护设备的设施,可以用来检验各种形式的养护窑(养护制度)对建筑用混凝土小型空心砌块、混凝土路面砖、干垒挡墙砌块和其它类型块材是否有效. 相似文献
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为防止低温环境下混凝土强度底对工程质量的影响,依托哈尔滨地区冬季施工项目,确定混凝土养护温度分别为-6、-12℃。并以养护温度、养护龄期、混凝土表面有无覆盖保温材料为参数设计10组混凝土试块,通过对混凝土试块进行低温受压试验,开展低温环境下保温材料对不同龄期混凝土强度的研究,结果表明:在低温养护条件下,在混凝土表面覆盖保温材料可有效提高混凝土早期强度,并且随着龄期的增长混凝土早期强度提高幅度逐渐减小;低温养护前期混凝土强度增长迅速,养护龄期7 d后强度增长缓慢,并且温度越低混凝土强度增长越缓慢。在试验数据的基础上,根据混凝土成熟度理论,拟合了3种不同函数模型(对数函数、指数函数、双曲函数)对应混凝土强度-成熟度曲线的参数,对比了不同模型之间拟合的准确性。 相似文献
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市政设施养护管理中使用黑色填浆料代替沥青混凝土在部分领域的应用提高了施工效率,降低施工成本,材料的各项性能指标符合质量要求,在市政设施建设中具有广阔的应用前景。 相似文献
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通过某医疗加速器机房工程大体积混凝土结构设计、施工,介绍了采用低强度等级的内掺微膨胀剂的补偿收缩混凝土,优化混凝土配合比设计,控制原材料的质量,选择低水化热的矿渣硅酸盐水泥,降低入模温度,加强隔热、保温和养护措施,实现了控制大体积混凝土裂缝的产生。 相似文献
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简述浙江省舟山市行政中心主体建筑的智能化系统方案设计。介绍了方案设计的基本内容、智能化子系统配置及各子系统的具体功能,以及有关的机房、电源、防雷接地设计等。 相似文献
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在设备室、热室做不锈钢覆面是一种新形式,安装不锈钢覆面在国内查无先例。根据不同的结构特点和技术要求,选择确定可行的施工方案,对安装不锈钢覆面的房间进行混凝土厚墙模板的设计,以满足要求。最后详细地介绍了设备室厚墙内外模板的施工技术。 相似文献
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The present study proposes the mix design method of Fly Ash (FA) based geopolymer concrete using Response Surface Methodology (RSM). In this method, different factors, including binder content, alkali/binder ratio, NS/NH ratio (sodium silicate/sodium hydroxide), NH molarity, and water/solids ratio were considered for the mix design of geopolymer concrete. The 2D contour plots were used to setup the mix design method to achieve the target compressive strength. The proposed mix design method of geopolymer concrete is divided into three categories based on curing regime, specifically one ambient curing (25 °C) and two heat curing (60 and 90 °C). The proposed mix design method of geopolymer concrete was validated through experimentation of M30, M50, and M70 concrete mixes at all curing regimes. The observed experimental compressive strength results validate the mix design method by more than 90% of their target strength. Furthermore, the current study concluded that the required compressive strength can be achieved by varying any factor in the mix design. In addition, the factor analysis revealed that the NS/NH ratio significantly affects the compressive strength of geopolymer concrete. 相似文献
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薄层活性粉末混凝土的现场免振捣浇筑施工 总被引:1,自引:0,他引:1
在预拌混凝土搅拌站工业化生产了活性粉末混凝土,并现场泵送、免振捣浇筑了最薄仅20mm的薄层混凝土结构。常温养护下混凝土结构表面光洁,无裂缝,其抗压强度达到100MPa以上,达到设计预期目标。 相似文献
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《Geotextiles and Geomembranes》2020,48(3):230-235
This research was conducted to investigate the shear strength at the interface between polymer concrete and asphalt concrete with geotextile as reinforcement at the interface of these two types of concrete. The samples were tested for the parameters of different surface conditions [rough and smooth], curing types [room and thermal curing], temperature effect and the impact of geotextile as reinforcement. To investigate the correlation between these parameters, four different testing conditions were implemented. The results showed a significant improvement of shear strength for rough surface sample as compared to smooth surface sample. Moreover, samples cured in oven had lower shear strength as compared to samples cured in room condition. Besides that, high temperature has an adverse impact on the shear strength at the interface between polymer concrete and asphalt concrete due to the weakening of asphalt concrete at high temperature. As for samples reinforced with geotextile, the shear strength resistance was better as compared to unreinforced samples. Through visual observation, the types of failure under all testing conditions were mixed failure mode. 相似文献
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为了对电离辐射进行生物防护,海南昌江核电站核辅助厂房部分装载放射性工艺设备房间的墙板采用了有防辐射作用的赤铁矿重混凝土,以防止核电站运行时产生的放射线泄漏至房间外。本文以该墙板施工为背景,介绍了重混凝土的性能指标、配合比设计及施工技术。 相似文献
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关于民用建筑的消防控制室的设置、手动火灾报警按钮的设置、疏散走道上电动防火卷帘门控制、自备应急发电设备的自启动时间、非消防电源断电方式等问题,火灾自动报警系统几个有关规范的具体条文规定不一致,作者进行比较后提出了自己的观点,明确了设计中应遵循的具体原则;通过消火栓水泵及非消防电源断电的控制,从设计及编程两方面分析了消防设备与联动控制设备间的协调问题。 相似文献
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《Construction and Building Materials》2006,20(3):149-157
This paper reports the results of experimental investigation carried out on the effect of reducing coarse aggregate (CA) quantity in mix proportions on the compressive strength of concrete. It also presents empirical formulas aimed at optimizing a concrete mix design for desert regions. Intensive laboratory experiment of 1350 samples of 30 different concrete mixes using three curing methods was carried out. The influences of the water/cement (W/C) ratio, coarse and fine aggregates (FA), CA/total aggregate (CA/TA) ratio, TA/C ratio, and curing methods (air curing, oven curing, and water curing) on the compressive strength of concrete were characterized and analyzed. Mathematical formula was developed for concrete strength as a function of CA quantity that ranges from the standard quantity to null, and another formula was developed for the quantity of FA as a function of compressive strength. 相似文献