利用粉煤灰生产高强和超轻陶粒

众所周知,粉煤灰陶粒是以粉煤灰为主要原料,掺加适量粘结剂和外掺剂,经加工成球,烧结或烧胀而成的一种人造工业废料轻集料.     

蒸压粉煤灰轻集料

蒸压粉煤灰轻集料是以粉煤灰为主要原材料,加入适量石膏、石灰、电石渣等辅助材料,经过高温、高压(192℃,1.2MPa)蒸压养护、破碎造粒等工艺制成的一种工业废渣类人造轻集料。适用于轻集料混凝土小型空心砌块、混凝土多孔砖、混凝土实心砖等土木建筑工程墙体材料作为骨料。     

灌芯复合保温砌块壳体材料研究

灌芯复合保温砌块壳体采用轻集料混凝土空心砌块,须具足够的力学性能(≥10MPa)和保温性能(导热系数≤0.56w/(m·K)),对于砌块的轻集料,尽量选用导热系数小的材料,应以页岩和粉煤灰陶粒为主,适当辅以工业废渣废料,保证轻集料含水率尽量小,同时还要优化混凝土的配合比,特别是轻集料的掺和量和级配要合理,确保轻集料混凝土具有优良的隔热保温性能。     

工业废渣在混凝土路面砖中的应用

开发先进的大型混凝土制品生产线和研制以工业固体废料处理为核心的建材产品机械是我公司的主业和宗旨。 2 0 0 0年利用我们研制的ＲＥＩＴ ＱＦＴ6成型机和ＲＴ 6全自动生产线 ,在鄂东南利用粉煤灰和钢渣成功开发了混凝土路面砖的生产 ,工业废渣掺量达 30 %以上 ,产品强度等级达Ｃｃ30～Ｃｃ60。一、原材料1 粉煤灰选用鄂州电厂干排灰 ,化学成份见表 1:　　表 1　粉煤灰废钢渣化学成份 (% )品　种 ＳｉＯ2 Ａｌ2 Ｏ2 ＣａＯ Ｆｅ2 Ｏ3 ＭｇＯ 烧失量粉煤灰废钢渣45 5 42 4 343 6 43 2 14 8416 6 62 3 82 6 172 2 6 3 2 9 15 8 987 88…     

《预应力非煅烧粉煤灰轻骨料空心板》标准图集的编制与研究

<正> 1、概述 预应力非煅烧粉煤灰轻骨料空心板(简称预应力轻砼空心板)是以非煅烧粉煤灰轻骨料(简称轻骨料)为粗集料,中砂为细集料,水泥为胶结料、冷拨低碳钢丝为预应力筋,经加工,制作而成的一种轻质砼制品。它适用于工业与民用建筑工程。     

对轻集料粒型的思考

从我国对轻集料的研究发展以来,除天然轻集料（例如浮石、火山渣等）和工业废料轻集料（例如自燃煤矸石等）为碎石型轻集料外,大多数人造轻集料（例如黏土陶粒、页岩陶粒和粉煤灰陶粒）均为圆球型轻集料。虽然《轻集料混凝土技术规程》 ＪＧＪ１５－９０把轻粗集料分为圆球型、普通型和碎石型,但其主要是按生产工艺进行的划分,而这里不考虑生产工艺,只按颗粒形状分为碎石型和圆球型。而国外大多采用碎石型轻集料。这固然和我国轻集料的生产工艺有关,但两种粒型哪种对轻集料混凝土的性能特别是商品混凝土的泵送性能更为有利,目前我国…     

优先开发和发展粉煤灰轻集料

系统介绍了国内外粉煤灰轻集料的生产方法和主要指标，并与粘土陶粒进行了比较，认为粉煤灰轻集料的生产、应用和发展前景更好，经数年调整、开发和市场竞争，必将成为我国人造轻集料市场的主导产品。     

优先开发和发展粉煤灰轻集料

本文系统介绍了国内外粉煤灰轻集料的生产方法和主要指标，并与粘土陶粒，页岩陶粒进行比较。分析认为，粉煤灰轻集料生产应用前景良好，必将成为我国人造轻集料市场的主导产品。     

优先开发和发展粉煤灰轻集料

本文系统介绍了国内外粉煤灰轻集料的生产方法和主要指标，并与粘土陶粒、页岩陶粒进行比较。分析认为，粉煤灰较集料生产应用前景良好，必将成为我国人造轻集料市场的主导产品。     

工业废渣混凝土多孔砖试制经验

工业废渣混凝土多孔砖是以粉煤灰、炉渣及其它废渣、水泥、各种轻集料、外加剂、水等为主要成分拌和制成的小型混凝土多孔砖,其中粉煤灰和各种废渣掺量不低于70%。本文介绍该类产品的原材料配制与处理要求、工艺流程与生产操作控制等。     

Determinants of atmospheric mercury concentrations in Reno, Nevada, U.S.A.

Concentrations of gaseous elemental mercury (GEM), gaseous oxidized mercury (GOM) and particulate-bound mercury (PBM) were measured along with ancillary variables 9 km east of downtown Reno, Nevada, U.S.A. from November 2006 through March 2009. Mean two-year (February 2007 through January 2009) GEM, GOM, and PBM concentrations were 2.0 ± 0.7 ng m^− 3 (± standard deviation), 18 ± 22 pg m^− 3, and 7 ± 7 pg m^− 3, respectively. Data collected were compared with observations made at another location just north of the city at 169 m higher elevation. At both locations higher concentrations of GEM and PBM occurred in periods with little atmospheric mixing, indicating that local sources were important for enhancing GEM and PBM concentrations in Reno above that considered continental background. Concentrations of GOM were higher (maximum of 177 pg m^− 3) during periods with higher temperature and lower dew point. Higher GOM concentrations at the higher elevation site with less urban impact relative to the valley site, along with other data trends, support the hypothesis that in northern Nevada subsiding dry air from the free troposphere is a source of GOM to the surface.     

Construction of underground works in Shanghai, P.R.C.

For nearly thirty years, Shanghai has been constructing underground works designed to improve the city's infrastructure. A number of projects were undertaken using shield tunnelling method in order to determine whether this method could be used successfully in Shanghai's geology, which is characterized by silt and silty or puddly clay. These underground projects have included subway tunnels, sewage and water supply tunnels, road tunnels, and offshore discharge tunnels. This paper describes eight subsurface projects in Shanghai that have used the shield tunnelling method successfully.