共查询到17条相似文献,搜索用时 78 毫秒
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利用上海金山区河道淤泥完全替代黏土生产出的河道淤泥烧结多孔砖,各项性能指标均符合GB13544—2000《烧结多孔砖》要求。本文从河道淤泥的干燥、混合料配合比、生产工艺等方面,介绍河道淤泥烧结多孔砖的关键生产技术。 相似文献
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研究一种新型墙体保温节能材料——河道淤泥烧结自保温砖的制备、性能测试及在实际工程中应用。河道淤泥自保温砖经检测,各项指标均达到GB 1 3544—2 000《烧结多孔砖》中MU10的要求,在上海市金山地区工程实践中开展了应用研究。结果表明,河道淤泥烧结自保温砖具有优良自保温性能,不仅能满足建筑节能6 5%的要求,而且能节约成本,产生良好的经济效益。 相似文献
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文章研究了九龙江水域河道淤泥的材料特性,并阐述了采用合理的配比与生产工艺,加入粉煤灰,在一定焙烧温度和焙烧时间下,制备出强度等级达到MU15的河道淤泥烧结多孔砖。所制成的多孔砖,各项指标均达到国家相应标准规定的要求。 相似文献
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对淤泥烧结多孔砖(矩形孔)的原材料、生产工艺和产品性能进行分析研究。结果表明:南通地区储有较丰厚的江河淤泥资源,利用长江淤泥可生产出强度高、干密度小、保温性能好、符合GB13544-2012《烧结多孔砖和多孔砌块》新标准技术要求的烧结多孔砖。 相似文献
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针对当前墙体材料发展问题,提出生物质燃料烧制河道淤泥烧结多孔砖的绿色生产技术,介绍了废弃物综合利用技术、太阳能干燥技术、烟气处理技术及余热利用技术,并在上海鑫晶山建材开发有限公司砖瓦厂示范应用。 相似文献
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Flocculation of river silt using chitosan 总被引:8,自引:0,他引:8
Flocculation of silt in river water using chitosan was studied in the pH range 4-9, and suspended solid concentrations in the range 20-80 mg/L. Chitosan effectively reduces turbidity due to silt by flocculation and settling. Flocculation efficiency is very sensitive to pH, and reaches a maximum at pH 7. The optimal chitosan concentration required to effect flocculation is 0.5 mg/L and is independent of silt concentration within the range examined. Restabilisation of the suspension is observed at higher concentrations of chitosan, and the amount required for restabilisation increases with increasing concentration of suspended solids. Flocculation is faster at higher concentrations of silt and the flocs are large and fibrous. 相似文献
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《Soils and Foundations》2022,62(6):101216
A large amount of river silt is continuously dredged and usually dumped in landfills or oceans, resulting in land occupation and environmental pollution. Traditionally, cement-based materials are used to cement dredged river silt as building materials, which not only increases carbon dioxide emissions but also uses very little dredged silt. In order to realize the resource utilization of dredged river silt, microbial induced calcium carbonate precipitation (MICP) technology, which has the advantages of lower energy consumption, less environmental pollution and lower carbon emissions, is adopted to solidify the dredged river silt as roadbed materials in this paper. The unconfined compressive strength (UCS) test, calcium carbonate (CaCO3) content test and microstructure test are carried out to analyze the mechanical properties of the solidified dredged river silt. The test results show that the MICP mixing method can be employed to solidify loose dredged river silt into high-strength construction materials. The concentration of the cementation solution has a significant effect on the solidification effect, and the most reasonable concentration of the cementation solution is 1.5 mol/L. With the increase of treatment times, the pores in the soil are filled with CaCO3, and the UCS of the specimens after 10 times of treatment can reach 6.75 MPa with a relatively uniform CaCO3 content of 27.8 %. The main crystal form of CaCO3 is calcite, which can fill the pores and make the river silt particles cement as a whole, which is the main reason for the improvement of mechanical properties of dredged river silt. 相似文献
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报载:每年流经长江三峡的泥沙约6亿t,三峡大坝建成后,由于水流速度减慢,长年累月,大量泥沙淤积库区,将使库容减少,河床升高,航道阻塞,并将威胁到三峡工程的正常运转。 相似文献