發(fā)布時間：2018-06-25 19:03

  本文選題：再生磚骨料透水混凝土 + 降堿�。� 參考：《山東農(nóng)業(yè)大學》2017年碩士論文

【摘要】：環(huán)境是人類賴以生存和發(fā)展的基礎,工程建設往往不可避免的損害當?shù)厣鷳B(tài)環(huán)境,環(huán)境惡化給人類生活帶來了危害,當今世界,保護環(huán)境、可持續(xù)發(fā)展的呼聲越來越高,工程建設也越來越重視與環(huán)境相協(xié)調(diào)。長期以來,我國城鎮(zhèn)舊民居很多是用黏土磚作為維護或承重材料,用青瓦或紅瓦做屋頂。現(xiàn)在,隨著我國城鎮(zhèn)化、新農(nóng)村建設的高速發(fā)展,拆遷下來的廢棄磚瓦成為固體垃圾,大量占用土地,污染環(huán)境。因此,我國目前及今后一個時期廢棄粘土磚瓦數(shù)量巨大,每年產(chǎn)生約8×106噸。而實際上,因黏土磚瓦具有全天候性、耐候性,這些拆除的磚瓦還有一定強度,還可再利用,可將其破碎、分級、清洗、掛漿強化后作為混凝土的骨料取代天然骨料,制備成再生磚瓦透水混凝土。生態(tài)透水混凝土對強度要求不高,而再生磚瓦骨料本身具有一定強度,可以配制中低等級的混凝土,可以作為固沙、固土、固堤護岸材料。透水混凝土空隙率通常在18-25%之間,透水、透氣特性好,將其作為骨架,向空隙中填充營養(yǎng)基材并覆一層土壤種植植物,既能加固邊坡又保持了綠色景觀,維護了生態(tài)平衡,可起到一舉多得的生態(tài)效益。本文主要以廢棄磚為原材料,分析借鑒國內(nèi)外再生骨料混凝土應用技術(shù),深入探索研究了再生磚骨料透水混凝土的制備工藝,物理、力學性能指標,確定簡便可行的降堿措施,并進行護坡植生試驗。(1)通過測定廢棄黏土磚骨料的表觀密度、堆積密度、顆粒級配、含水率、吸水率、壓碎指標等物理性能,借鑒國內(nèi)外再生骨料處理工藝,針對廢棄黏土磚微裂縫多,強度低等特殊性,研究出適合再生磚骨料的制備、強化工藝。(2)以等量取代水泥用量的方法單摻礦物摻合料粉煤灰、礦渣微粉、硅灰制備再生磚骨料透水混凝土,并進行標準養(yǎng)護,對比研究了不同齡期不同摻量的不同摻合料對混凝土內(nèi)部孔隙pH的影響規(guī)律,以及28天抗壓強度值的變化。試驗表明,單摻礦物摻合料能夠降低再生磚透水混凝土內(nèi)部孔隙的pH值0.5-1,28天抗壓強度較不摻時略有提高,其中硅灰效果最明顯。粉煤灰、礦渣適宜摻量10%-30%,硅灰適宜摻量5%-10%。(3)以等量取代水用量的方法添加酸性試劑FeSO_4溶液,制備再生磚骨料透水混凝土,并進行標準養(yǎng)護,研究了不同摻量對混凝土28天抗壓強度、內(nèi)部孔隙中pH的影響。研究表明,FeSO_4溶液濃度在0.25mol/L-0.75mol/L之間時,以10%的FeSO_4溶液取代拌合用水對再生磚透水混凝土的降堿效果較好,能夠降低pH值1左右,并且促進水泥水化的進行,使得該混凝土的28天抗壓強度較不摻時提高0.5-1MPa。(4)設計并制作了一種半球型的模具,用來制備再生磚透水混凝土單元體,進行護坡植生試驗。半球塊體的比表面積大,為植物提供更多的生長面積,表面孔隙也為小動物的棲息提供空間,而且,塊體之間的空隙適合灌木生長,錯落有致的護坡景觀更加符合生態(tài)要求。(5)綜合前期力學性能、透水性和內(nèi)部孔隙水溶液堿性的研究結(jié)果,研究確定合理的護坡技術(shù)措施,進行護坡工程試驗,觀察記錄植物長勢情況。植物長期生長效果良好,有很好的生態(tài)效果。據(jù)此,提出合理的施工質(zhì)量標準及要求,形成護坡施工技術(shù)及工藝。
[Abstract]:Environment is the basis of human survival and development, engineering construction often inevitably damage the local ecological environment, environmental deterioration has brought harm to human life. Today, the world, the protection of the environment, the sustainable development of the voice of higher and higher, the engineering construction is more and more important to coordinate with the environment. The clay brick is used as the maintenance or bearing material, and the roof is made of green tiles or red tiles. Now, with the urbanization of China and the rapid development of the new rural construction, the abandoned bricks and tiles which are removed become solid wastes, occupy a large amount of land and pollute the environment. Therefore, the number of clay bricks and tiles is huge, which produces about 8 * 1 a year in China and in the future. 06 tons. In fact, the clay brick and tile have all-weather and weatherability. These bricks and tiles have some strength and can be used again. They can be broken, graded, cleaned and reinforced as concrete aggregate instead of natural aggregate. The tile aggregate itself has a certain strength, which can be made up of middle and low grade concrete, which can be used as sand fixing, solid soil and embankment revetment. The porosity of permeable concrete is usually between 18-25%, water permeable and breathable, which is used as a skeleton, filling the nutrient base material to the gap and covering a layer of soil plant, which can reinforce the slope and keep green. Color landscape, maintaining the ecological balance, can play a great ecological benefit. This paper mainly uses waste bricks as raw materials, analyzes and draws on the application technology of recycled aggregate concrete at home and abroad, and deeply explores the preparation technology, physics, mechanical performance indexes of recycled brick aggregate concrete, and determines the simple and feasible measures for reducing alkali. (1) by measuring the apparent density, accumulation density, grain gradation, water content, water absorption, crushing index, and other physical properties of the waste clay brick aggregate, using the regenerated aggregate treatment technology at home and abroad for reference, the preparation of the recycled brick aggregate and the strengthening process are studied. (2) In order to replace the cement content with the same amount of cement, single mineral admixture fly ash, slag powder and silica fume are used to prepare recycled brick aggregate pervious concrete, and the standard curing is carried out. The influence law of different admixtures on the internal pore pH of concrete at different ages and the change of 28 days compressive strength value are compared. Mineral admixture can reduce the pH value 0.5-1,28 day compressive strength of the inner pore of reclaimed brick permeable concrete slightly higher than that of non admixture, in which the effect of silica fume is the most obvious. Fly ash, slag suitable amount of 10%-30%, suitable dosage of 5%-10%. (3) of silica fume to add acid reagent FeSO_4 solution in the same amount of water content, to prepare recycled brick aggregate Water concrete, and the standard curing, has been carried out to study the effect of different dosage on the 28 day compressive strength of concrete and the effect of pH in the inner pores. The study shows that, when the concentration of FeSO_4 solution is between 0.25mol/L-0.75mol/L, 10% FeSO_4 solution is replaced with water to reduce the alkali effect of the recycled brick pervious concrete, and it can reduce the pH value of about 1 and promote it. The 28 day compressive strength of the concrete is improved by 0.5-1MPa. (4). A hemispherical mold is designed and produced to prepare the regenerated brick pervious concrete unit and carry out the slope protection test. The surface area of the hemispherical block is large, and the surface area of the plant is more, the surface pore is also small movement. The space between the objects is provided with space, and the gap between the blocks is suitable for the growth of shrubs. The wrong slope protection landscape is more in line with the ecological requirements. (5) the research results of the comprehensive early mechanical properties, water permeability and the alkalinity of the inner pore water solution are used to determine the reasonable technical measures for slope protection, to carry out the slope protection engineering test and to observe the plant growth situation. The long-term growth effect of the plant is good and has good ecological effect. Accordingly, reasonable construction quality standards and requirements are put forward, and slope protection construction technology and technology are formed.
【學位授予單位】：山東農(nóng)業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU528;TU753.8

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