The present study addresses the global concern of sustainability in building and construction engineering and how to an extent the use of demolished aggregate wastes in concrete production contributes towards ameliora...The present study addresses the global concern of sustainability in building and construction engineering and how to an extent the use of demolished aggregate wastes in concrete production contributes towards ameliorating or minimizing the problem. The influence of demolished aggregate waste on the mechanical strength and stiffness of concrete are examined from the standpoint of the compressive, split tensile and flexural strengths as well as the modulus of elasticity of the concrete. In this respect the research carried out by previous investigators are noted. It is observed that in the Southern African region in general and Botswana in particular there is a paucity of studies on the subject, and consequently, it is concluded that further investigations need to be conducted utilizing aggregates derived from local wastes or sources.展开更多
In an earlier study, a comprehensive and critical review of previous investigations into the assessment of the strength of concrete incorporating aggregates from demolished wastes was conducted and it was concluded th...In an earlier study, a comprehensive and critical review of previous investigations into the assessment of the strength of concrete incorporating aggregates from demolished wastes was conducted and it was concluded that there was a stark absence of results from the South African sub-continent including Botswana. In the present study, recycled coarse aggregates (RCA) sourced from demolished wastes collected from a landfill site in Gaborone, Botswana was used in lieu of natural coarse aggregates for the manufacture of concrete. With reference to the natural coarse aggregate, RCA replacement levels of 0%, 20%, 40%, 60%, 80% and 100% were utilized and the results of hardened concrete tests for compressive and flexural strengths were obtained. It was found that in general the compressive and flexural strengths of the recycled aggregate concrete (RAC) decreased with increasing replacement levels of natural coarse aggregates using RCA. It was concluded that RCA could be employed as a substitute for natural aggregate in concrete only up to a certain limit or partial replacement. In this respect, it was also noted that the undesirable properties of RCA were primarily due to the quantity and quality of the adhering mortar.展开更多
The discrimination of synonyms has always been the key and difficult points in language learning.By using the British Na⁃tional Corpus(BNC)to retrieve the standard frequency,registers and collocations of the three com...The discrimination of synonyms has always been the key and difficult points in language learning.By using the British Na⁃tional Corpus(BNC)to retrieve the standard frequency,registers and collocations of the three common words,DESTORY,RUIN and DEMOLISH,this paper analyzes their similarities and differences.Besides,this paper demonstrates the strong ancillary func⁃tion of corpus in synonyms discrimination as well as in English teaching and learning.展开更多
老舍英文话剧The Spear that Demolishes Five Tigers at Once是对其短篇小说《断魂枪》的改写。在剧本里,老舍不再像英译《离婚》时那样以批判中国文化为旨归,而是通过改写颂扬中国文化,并把文化传统中的"刚性文化"特质与西...老舍英文话剧The Spear that Demolishes Five Tigers at Once是对其短篇小说《断魂枪》的改写。在剧本里,老舍不再像英译《离婚》时那样以批判中国文化为旨归,而是通过改写颂扬中国文化,并把文化传统中的"刚性文化"特质与西方新型的科学技术结合,从而建构他自1930年代就开始思考并不断丰富的中国精神文化现代化的"内涵"。展开更多
【选注者言:我在上海《新民晚报》上看到一则印度人用大象摧毁非法建筑的消息,觉得很新鲜,在次日的因特网上读到此文,现发你们。读晚报短文,只获一笑,而读此文却可学到英语。本文最美的句子是:Officials decided to use theelephants af...【选注者言:我在上海《新民晚报》上看到一则印度人用大象摧毁非法建筑的消息,觉得很新鲜,在次日的因特网上读到此文,现发你们。读晚报短文,只获一笑,而读此文却可学到英语。本文最美的句子是:Officials decided to use theelephants after attempts to chase away the squatters(擅自占住者;在公地上定住者)resulted in clashes(冲突)that killed one person and injured dozens of police andforestry agents(林产代理人)。读者不妨细细体味其“End-weight”。】展开更多
文摘The present study addresses the global concern of sustainability in building and construction engineering and how to an extent the use of demolished aggregate wastes in concrete production contributes towards ameliorating or minimizing the problem. The influence of demolished aggregate waste on the mechanical strength and stiffness of concrete are examined from the standpoint of the compressive, split tensile and flexural strengths as well as the modulus of elasticity of the concrete. In this respect the research carried out by previous investigators are noted. It is observed that in the Southern African region in general and Botswana in particular there is a paucity of studies on the subject, and consequently, it is concluded that further investigations need to be conducted utilizing aggregates derived from local wastes or sources.
文摘In an earlier study, a comprehensive and critical review of previous investigations into the assessment of the strength of concrete incorporating aggregates from demolished wastes was conducted and it was concluded that there was a stark absence of results from the South African sub-continent including Botswana. In the present study, recycled coarse aggregates (RCA) sourced from demolished wastes collected from a landfill site in Gaborone, Botswana was used in lieu of natural coarse aggregates for the manufacture of concrete. With reference to the natural coarse aggregate, RCA replacement levels of 0%, 20%, 40%, 60%, 80% and 100% were utilized and the results of hardened concrete tests for compressive and flexural strengths were obtained. It was found that in general the compressive and flexural strengths of the recycled aggregate concrete (RAC) decreased with increasing replacement levels of natural coarse aggregates using RCA. It was concluded that RCA could be employed as a substitute for natural aggregate in concrete only up to a certain limit or partial replacement. In this respect, it was also noted that the undesirable properties of RCA were primarily due to the quantity and quality of the adhering mortar.
文摘The discrimination of synonyms has always been the key and difficult points in language learning.By using the British Na⁃tional Corpus(BNC)to retrieve the standard frequency,registers and collocations of the three common words,DESTORY,RUIN and DEMOLISH,this paper analyzes their similarities and differences.Besides,this paper demonstrates the strong ancillary func⁃tion of corpus in synonyms discrimination as well as in English teaching and learning.
文摘老舍英文话剧The Spear that Demolishes Five Tigers at Once是对其短篇小说《断魂枪》的改写。在剧本里,老舍不再像英译《离婚》时那样以批判中国文化为旨归,而是通过改写颂扬中国文化,并把文化传统中的"刚性文化"特质与西方新型的科学技术结合,从而建构他自1930年代就开始思考并不断丰富的中国精神文化现代化的"内涵"。
文摘【选注者言:我在上海《新民晚报》上看到一则印度人用大象摧毁非法建筑的消息,觉得很新鲜,在次日的因特网上读到此文,现发你们。读晚报短文,只获一笑,而读此文却可学到英语。本文最美的句子是:Officials decided to use theelephants after attempts to chase away the squatters(擅自占住者;在公地上定住者)resulted in clashes(冲突)that killed one person and injured dozens of police andforestry agents(林产代理人)。读者不妨细细体味其“End-weight”。】
