共查询到20条相似文献,搜索用时 156 毫秒
1.
采用污泥-煤矸石-页岩三元体系制备烧结砖,分析了污泥粒径、掺量对烧结砖坯体混合料塑性指数的影响,研究了污泥掺量和烧成制度对烧结砖抗压强度、体积密度、干燥收缩、吸水率和泛霜的影响;选取Cu、Cr、Pb三种代表性重金属,超量掺入污泥页岩混合料中,研究烧结过程中的重金属挥发和对重金属的固化能力。结果表明:掺加污泥能够改善泥料的可塑性,可以降低烧结砖的体积密度,但会增加烧结砖的干燥收缩;掺入污泥会使烧成试样出现泛霜,掺量越多泛霜程度越严重;当污泥掺量为18%时,烧结温度为1050℃,保温时间为6h,烧结砖的性能最佳,且污泥中的重金属可有效固溶于材料内部,其总Cu、总Cr、总Pb浸出浓度远低于安全标准控制值。 相似文献
2.
河道淤泥烧结节能砖的研究与开发 总被引:1,自引:1,他引:0
从研究淤泥的化学成分、矿物成分及热特性出发,采用稻壳和木屑作成孔剂,研究成孔剂掺量对淤泥保温砖的强度、气孔率、吸水率及密度的影响,并研究了2种成孔剂制备的烧结砖的孔结构.结果表明,当成孔剂掺量(质量百分比)为10%,烧结温度为950℃时,制备的淤泥砖强度达10MPa以上,密度为1100 kg/m3左右.经工厂中试,各项性能指标均符合GB 13545─2003<烧结空心砖和空心砌块要求,淤泥模数砖裸墙热阻达0.765 m2·K/W. 相似文献
3.
4.
5.
6.
7.
《新型建筑材料》2017,(1)
采用城市污泥和河道淤泥为原料,利用干法成型工艺制备了不同污泥含量的烧结砖。研究了原料的物理与化学性质,以及污泥种类(低温干化污泥和隔膜压滤污泥)、含水率、烧结温度和污泥掺量对污泥烧结砖的影响。污泥种类的影响较大,CaO含量过高容易引起砖体强度快速降低。原料含水率影响烧结砖的密度和强度,低温干化污泥含量10%原料的最优含水率为16%。污泥烧结砖的强度随着烧结温度的升高而增大,1000℃时污泥烧结砖强度最大。污泥含量越高,烧结砖强度越低,污泥砖符合MU30、MU20和MU10标准时的最大污泥掺量分别为17.4%、21.5%和24.9%。综上所述,通过原料和工艺的控制,成功制备了污泥掺量高达20%的污泥烧结砖,强度满足MU20的要求,可作承重砖使用,重金属熔融固化,展示了一种污泥大规模资源化利用的途径。 相似文献
8.
以水基钻井岩屑(水基钻屑)为原料替代部分页岩制备烧结砖,分析了水基钻屑的化学成分、矿物组成以及热重性能,通过单因素实验确定了水基钻屑掺量、烧结温度、保温时间对烧结砖抗压强度、吸水率、体积密度、线性收缩率等的影响。结果表明,在水基钻屑掺量20%,烧结温度1000℃,保温时间2 h的情况下制得的烧结砖抗压强度为20.34 MPa,吸水率为17.08%,体积密度1.764 g/cm3,线性收缩率3.32%。XRD与SEM分析发现,水基钻井岩屑因为石英含量较少,物理性能会随着其掺量增大而显著降低。烧结温度过高和保温时间过长也会导致烧结砖过烧现象的发生,体现在微观上液相大量增加,宏观上则表现为体积密度、抗压强度降低以及吸水率、线性收缩率增大。 相似文献
9.
10.
11.
分析了煤矸石烧结砖的产品特点及工艺特点,从化学成分、发热量、硬度方面介绍了制作煤矸石空心烧结砖所用煤矸石原材料应满足的基本性能,并阐述了煤矸石制作烧结砖瓦的工艺方法,指出煤矸石砖瓦在新型建筑材料市场上具有广阔的发展前景。 相似文献
12.
13.
将页岩与膨润土以不同比例混合,通过抗压强度、烧结收缩率、体积密度、吸水率和显气孔率作为指标,分析了不同的烧结温度及烧结时间对膨润土页岩烧结砖性能的影响。 相似文献
14.
15.
针对目前建筑工程上广泛使用的烧结煤矸石砖和烧结页岩砖等以非黏土材料为原料的砖,所引发的工程质量问题,经过调查研究和分析原因,提出了解决的办法和建议。 相似文献
16.
本实验将高含水率污水污泥与来源广泛的页岩进行混合,在固定污泥掺量,变化烧成温度、升温速率和保温时间等因素的基础上进行实心和多孔污泥页岩烧结砖的烧制。结果表明,污泥掺量30%时可以烧制出体积密度1600 kg/m3左右,抗压强度10MPa以上的实心砖,在此基础上对污水污泥对烧结砖的性能影响进行了实验研究。 相似文献
17.
为降低烧结砖墙体的"使用耗能",烧结空心砖采用薄壁多孔洞单向错位排列结构设计。比对试验证明,单向错位排列的孔洞结构导致烧结空心砖的不同受压面的抗压强度相差悬殊。因此,烧结空心砖必须按产品说明书规定的砌筑面施工和检测。节能型烧结空心砖(砌块)是烧结空心砖(砌块)的一种,也属于"烧结保温砖和烧结保温砌块"。目前尚无国家、行业、地方"节能型烧结空心砖和空心砌块"专用标准,该文建议将《烧结保温砖和保温砌块》(GB26538-2011)作为"节能型烧结空心砖"产品标准执行。砖厂应在产品说明书中标明"砌筑面"及强度等级,施工必须按规定面砌筑。 相似文献
18.
Yaqian Zhao Baiming Ren Andrew O’Brien Simon O’Toole 《The International journal of environmental studies》2016,73(5):719-730
Throughout the world, alum sludge is dewatered and the resultant cakes are discarded in landfill. This paper reports a study to investigate the possible incorporation of alum sludge as a partial replacement for clay in clay brick manufacturing. It is the first study of this problem in Ireland. Alum sludge cakes and clay were separately dried, ground and sieved in preparation for making test specimens. Cylindrical clay bricks were made at different temperatures (800, 1000, 1100, 1200 °C), incorporating different percentages (0, 5, 10, 15, 20, 30, 40% by dry weight) of alum sludge. The bricks were then subjected to compressive strength test and submersion. Loss on ignition, water absorption and weight reduction were calculated. It was found that bricks containing up to 20% sludge, fired at 1200 °C, or containing 5% sludge and fired at 1100 °C have met the European and Irish Standards as set out by Eurocode 6 – ‘Design of Masonry Structures’. The firing temperature and the increase in sludge content affected the final clay-sludge brick colour. By increasing the proportion of alum sludge, compressive strength decreased and the final weight of the brick was reduced. Firing temperatures that are too high may result in damage to the bricks during firing. This study has demonstrated the promising potential and prospects for Irish dewatered alum sludge cakes in clay-sludge brick making. 相似文献
19.
《Construction and Building Materials》2005,19(2):117-126
The dumping of spent grains is going to be more difficult because of the increasing number of cattle. That means new ways of dumping must be developed.The goal of the work was to test the technical properties of bricks produced with spent grains added to increase porosity.The flexural strength of the fired samples remained at 8.5 MPa; the air-dried samples exhibited a small increase in flexural strength. The shrinkage and true density were almost identical, while the raw density, capacity for water absorption and open porosity showed minor differences.In the large-scale experiment no problems were observed during the production. The bricks produced with spent grains possessed a comparable or higher strength, a higher porosity and a reduced density after firing than those from a standard production clay. Because of the lower sintering temperatures the fired clay product was more strongly sintered, exhibiting both greater strength and higher porosity. 相似文献