Self-cleaning and colour-preserving efficiency of photocatalytic concrete: case study of the Jubilee Church in Rome

ABSTRACT

The Jubilee Church in the south-eastern outskirts of Rome is one of the first buildings constructed with super white reinforced concrete with self-cleaning photocatalytic cement. However, 16 years after the opening of the building, the self-cleaning and colour-preserving properties arising from the titania particles (TiO2) within the concrete mix are not meeting the design requirements and the concrete is showing premature evidence of decay. While the form of the decay is affecting the appearance of the building and not its structural soundness, the ageing pattern of the building's components is resulting in a high maintenance cost, one not easily affordable within the ordinary budget supported by a small parish. This study comprises the first comprehensive step in understanding the causes of the accelerated ageing pattern of the concrete, highlighting methods to improve the long-term durability of the concrete and therefore reduce the cost of its maintenance. Moreover, this research offered the opportunity to test the durability and the effectiveness of the TiO₂ in the real conditions on an actual building featuring non-standard geometries. The findings highlight how the ageing pattern directly connects with the geometry of the building and inadequate consideration of the local weathering at the design stage.     

浅谈某高层建筑消防给水系统设计的改造变更

本文以某高层建筑为例,介绍了首、二层设置商业服务网点的居住建筑改为首、二层为商业的商住楼后,对原有消防水池、消防泵、室内外消火栓管网、自动喷水灭火系统的变更设计。     

Electrochemical conversion of switchgrass and poplar in molten carbonate direct carbon fuel cell

One way of sustaining fuel cell technology is using renewable and sustainable energy means provided by biomass. This article explores switchgrass and poplar in a molten carbonate electrolyte direct carbon fuel cell. It investigates their electrochemical conversions and provides results of power density, current density, open circuit voltage (OCV) and other parameters. The biomasses were pyrolysed at 800°C to produce carbon fuels. Biomass carbon fuels were mixed with molten carbonate and subjected to different operating conditions (600–800°C) in the fuel cell. The electrochemical performances of the poplar fuel were better than those experienced with switchgrass fuel. At 800°C the OCV of poplar fuel (1.08?V) has higher output than switchgrass (0.87?V). The peak power density recorded for poplar fuel was 23.91?mW/cm² while switchgrass fuel was lower at 21.60?mW/cm². Poplar fuel (81.53?mA/cm²) gave a maximum current density with switchgrass fuel lower at 74.00?mA/cm².     

透视仿射对应在画法几何中的应用与研究

在画法几何中,求作一般位置平面与立体表面的截交线以及圆、曲面立体截交线的轴测投影等问题时,往往作图比较复杂,且不能保证作图的准确性,而灵活运用透视仿射对应法,则能使此类问题得到简化。本文简要阐述了透视仿射对应的基本理论和性质,并通过实例说明了透视仿射对应在画法几何中的应用。     

嘉绍大桥主航道桥最优合龙顺序研究

嘉绍大桥主航道桥是世界上首座六塔、双幅、空间四索面斜拉桥,其有7个合龙口,合龙方案复杂。通过建立采用不同合龙顺序的有限元模型,比较各种合龙顺序下,合龙时所需压重,斜拉索临时调索量;施工过程及成桥时主梁应力、塔偏、索塔应力、斜拉索应力及各种合龙顺序对施工进度、施工安全性的影响,确定最优合龙顺序。     

浅析伊东丰雄对于“流动性”的转变

在当下电子信息迅猛发展的时代,信息技术已经逐渐成为了人们生活当中不可或缺的一个重要部分,同时也影响着人们的生存观念和生活方式,进而对建筑的设计也产生了不小的影响和冲击。以日本建筑师伊东丰雄获得普利茨克奖为契机,在对伊东丰雄以往作品进行回顾和探讨的同时,从大家所熟悉的空间流动性为线索来解析在伊东丰雄的建筑中所包含的不同寻常的特质以及这种特质的转变。通过对建筑流动性转变的浅析,再次解读伊东在对于建筑创作的过程当中与同僚的不同之处。     

北京室内游乐馆结构设计

介绍了北京室内游乐馆的结构体系、结构规则性、荷载分项系数、材料等内容,并进行了多遇地震内力分析、性能化分析和设计以及基础分析,结果表明:该设计满足规范要求,达到了预期目标。     

高空泳池施工技术

以某高空泳池施工为例,结合泳池的工程概况,对泳池施工的重点与难点进行了分析,通过前期策划,选择了合理可行的技术措施,主要对模板的支设工艺与混凝土的施工工艺进行了阐述,以确保施工质量。     

技术进步与建筑界面形态的演变

技术进步正大跨步地改变着人们的生产方式、生活习惯,亦影响着人们的审美观念,尤其是迅猛发展的高新技术给社会带来巨大变革的同时,也对建筑领域产生了极大的影响。建筑材料类型的丰富、建筑结构技艺的更迭、建筑设备性能的升级都直接或者间接地牵制着建筑形态。本文通过对技术变革剧烈的近现代时期典型建筑界面形态在结构技术及计算技术两个层面的解析,厘清其在技术演进路线上的演绎步进,探讨建筑界面发展趋势,以及对其产生影响的各种技术因素的内在联系。     

建筑设计中的复杂曲面建构与优化策略研究

随着数字技术的快速发展．复杂曲面形态已越来越多地应用于建筑设计中,数字化的生产方式与生产工具也在不断更新与升级．曲面的建构与优化过程对于复杂曲面建筑的实际建造效果有着举足轻重的意义,已成为建筑设计实践过程研究的重要方向。针对这一问题．本文首先归纳并论述复杂曲面建筑的发展历程．进而对建筑设计中复杂曲面的建构逻辑和方法进行研究和阐释．以此作为曲面优化设计的理论基础和依据．最后通过对实际案例的分析归纳,从曲面几何形态,结构形态、环境性能等方面提出深化设计阶段相应的曲面优化策略。