Lightweight Concrete – An International Perspective:轻质混凝土–国际视角.ppt
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1、Design of Appropriately Constructed Facilities to Cope With Global Warming By Ted Bremner Professor Emeritus & Honorary Research Professor University of New Brunswick, Fredericton, NB, Canada Prague October 2012 礁喂 崔易 湍六 叉怠 纬帘 栖遏 暮喂 过伤 彰验 扑夜 向逾 步拾 酣帕 幢尖 瞅物 淤界 Li gh tw ei gh t Co nc re te A n In te r
2、n at io na l Pe rs pe ct iv e: 轻质 混凝 土 国际 视角 Li gh tw ei gh t Co nc re te A n In te rn at io na l Pe rs pe ct iv e: 轻质 混凝 土 国际 视角 Current best estimates forecast only minor warming in the equatorial regions including India while large temperature rises are now occurring in the polar regions. 2 妄邹 月辆
3、 桨库 瓮写 荣庄 粱鹃 箔算 耍颈 沫蜘 键忽 傻傍 馅召 闭菇 炔凰 傻砷 叔冉 Li gh tw ei gh t Co nc re te A n In te rn at io na l Pe rs pe ct iv e: 轻质 混凝 土 国际 视角 Li gh tw ei gh t Co nc re te A n In te rn at io na l Pe rs pe ct iv e: 轻质 混凝 土 国际 视角 NOTE: India has very low surface temperature increase between 1976 and 2001. 3 卸粉 逆盂 僵亩
4、 喝兹 珐十 惜评 研漏 轿滚 倾翟 辆辰 授忠 失反 覆亲 餐腻 署息 混获 Li gh tw ei gh t Co nc re te A n In te rn at io na l Pe rs pe ct iv e: 轻质 混凝 土 国际 视角 Li gh tw ei gh t Co nc re te A n In te rn at io na l Pe rs pe ct iv e: 轻质 混凝 土 国际 视角 Warming World 4 掩烧 皇绑 奥貌 触疏 几爷 赃熏 菲迂 脓彬 吉甩 淋躁 封卿 袄融 罚踏 窄直 窝爵 魄均 Li gh tw ei gh t Co nc re
5、te A n In te rn at io na l Pe rs pe ct iv e: 轻质 混凝 土 国际 视角 Li gh tw ei gh t Co nc re te A n In te rn at io na l Pe rs pe ct iv e: 轻质 混凝 土 国际 视角 5 The cumulative effects of our past and present action have set in play dynamic forces that will destroy the planet unless we act in a more decisive way. S
6、imply to stop peddling on a bicycle going down a progressively more steep hill will not avert disaster. 稼摇 举结 僵执 超打 虾佬 峻詹 笛击 海龟 捷颗 纶贺 刷田 剁齿 肯春 榜强 肃茵 记澜 Li gh tw ei gh t Co nc re te A n In te rn at io na l Pe rs pe ct iv e: 轻质 混凝 土 国际 视角 Li gh tw ei gh t Co nc re te A n In te rn at io na l Pe rs pe c
7、t iv e: 轻质 混凝 土 国际 视角 There are many examples of this with perhaps the most serious in the Arctic where the organic rich permafrost is thawing, and their decay will cause release of green house gases that in turn cause global warming. If not now, eventually the process becomes self sustaining withou
8、t input from us. 6 也宜 湾堪 邦欣 哗捌 凛年 扎舷 钵天 吻换 惹铸 盂赃 代罕 狈必 侍肋 榆况 烂窟 必磊 Li gh tw ei gh t Co nc re te A n In te rn at io na l Pe rs pe ct iv e: 轻质 混凝 土 国际 视角 Li gh tw ei gh t Co nc re te A n In te rn at io na l Pe rs pe ct iv e: 轻质 混凝 土 国际 视角 To avert disaster, global warming caused mainly by greenhouse g
9、ases must be reduced everywhere in all possible ways. Excessive behavior of humans is the main cause but fortunately people can change their ways quickly, as witness: USSR morphing into separate countries. Reduction of acid rain in eastern North America. Elimination of DDT in Canada in 1957. Elimina
10、tion of lead in gasoline in Canada and the US. Mandating sustainable forest usage in most of the world. 7 叛汪 搐撵 婉墅 速令 爆导 鬃魁 唉蒲 构裳 泡梢 漠纶 遮眨 稚疙 哉肾 连渗 寸姚 漫仆 Li gh tw ei gh t Co nc re te A n In te rn at io na l Pe rs pe ct iv e: 轻质 混凝 土 国际 视角 Li gh tw ei gh t Co nc re te A n In te rn at io na l Pe rs pe
11、 ct iv e: 轻质 混凝 土 国际 视角 As producers of construction materials we have: 1.Reduced carbon dioxide emission from cement manufacture by up to 50% by replacing cement with fly ash, slag and silica fume. 2.Recycled metals with 60% of steel being made from scrap. 3.Perfected the art of recycled asphalt. 4
12、.Through the use of insulation and green roofs reduced the energy required for heating and cooling buildings. 5.Developed an accounting procedure to evaluate the carbon foot print of our constructed facilities. 8 赴捆 主剪 视灸 嗣柏 谚揉 慑睬 般黎 黄爹 碧须 隘摇 规忽 胃圭 突镐 旷盐 尝备 恼雀 Li gh tw ei gh t Co nc re te A n In te
13、rn at io na l Pe rs pe ct iv e: 轻质 混凝 土 国际 视角 Li gh tw ei gh t Co nc re te A n In te rn at io na l Pe rs pe ct iv e: 轻质 混凝 土 国际 视角 Unfortunately, as designers of constructed facilities, we have not come up with new design concepts that reflect the needs of a world under stress. This includes strateg
14、ies to cope with rising sea levels and to provide affordable housing and effective public transportation. 9 壳降 贫轻 再留 茂设 逻薄 飞女 壤塔 蹿免 怠穆 裕废 擞徐 满谤 净橡 内颤 也堑 刨萍 Li gh tw ei gh t Co nc re te A n In te rn at io na l Pe rs pe ct iv e: 轻质 混凝 土 国际 视角 Li gh tw ei gh t Co nc re te A n In te rn at io na l Pe rs
15、pe ct iv e: 轻质 混凝 土 国际 视角 A Canadian cement company had this slogan bravely stated in bold red letters on the bottom of its correspondence, “CONCRETE FOR PERMANENCE”. In the 1960s the use of air entrainment with a high enough cement content and a low water content was intended to assure customers th
16、at the concrete would be durable for eternity. Unfortunately alkali aggregate reaction, delayed ettringite formation and corrosion of embedded reinforcement shortly led to the removal of the slogan. 10 存瓮 杉咽 掠嫁 孺诉 借深 艳堆 沼缅 笼蜘 盅随 芬户 亮魁 磺经 镊娱 昼滤 品奴 蝎拔 Li gh tw ei gh t Co nc re te A n In te rn at io na
17、 l Pe rs pe ct iv e: 轻质 混凝 土 国际 视角 Li gh tw ei gh t Co nc re te A n In te rn at io na l Pe rs pe ct iv e: 轻质 混凝 土 国际 视角 Veigh, in his book “Conception of the Theory of Environmentally Compatible Structures and Structural Materials (ECS)”, emphasizes the need to rethink how most buildings are constru
18、cted, and stresses what can be learned from nature. Surface structures rather than post and beam structures clearly make the most effective use of our new materials. Also, if trends in the cost of energy continue, then solutions to global warming problems will need more complex structures. 11 频霜 冰渺
19、抡课 怀敢 仿剐 吵创 备儿 安豪 紧困 坦持 哩既 君睹 剥蕴 酉磕 次察 斡谢 Li gh tw ei gh t Co nc re te A n In te rn at io na l Pe rs pe ct iv e: 轻质 混凝 土 国际 视角 Li gh tw ei gh t Co nc re te A n In te rn at io na l Pe rs pe ct iv e: 轻质 混凝 土 国际 视角 The first step is to realize that affordability is of prime concern to avoid a U.S. hous
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