基于规划求解的水泥粉煤灰混合料配合比设计方法

为提高水泥粉煤灰混合料的设计质量，提出了基于规划求解的水泥粉煤灰混合料配合比设计方法。利用规划求解的方式，通过试验确定粉煤灰和水泥掺量对混合料无侧限抗压强度、干密度、含水量的影响，最终确定水泥与粉煤灰的配合比。试验结果表明：当粉煤灰的掺量为11%,水泥的掺量为5.5%时，水泥粉煤灰混合料的无侧限抗压强度达到了最高值，并且混合料的干密度和含水量也满足标准要求，水泥粉煤灰混合料设计配合比为5.5∶11,施工配合比为6∶11.5时混合料的性能表现最佳。     

粉煤灰作铁路路基填料的应用研究

在室内和现场试验基础上，对粉煤灰作铁路路基填料进行全面分析，得出了粉煤灰的物理力学性质，提出了粉煤灰填筑铁路路基的设计方案和施工过程中的工程技术措施，从而为粉煤灰作公路路基填料提供依据。     

引水隧道混凝土衬砌中粉煤灰含量对抗压强度的影响

水工工程大量使用粉煤灰取代水泥，使用粉煤灰配制混凝土的性能严重影响施工效果，因此研究引水隧道混凝土衬砌中粉煤灰含量对抗压强度的影响有重要意义。本研究通过调整粉煤灰含量，分别制备了15%、25%与35%等3种粉煤灰含量的混凝土试件，并改变养护温度，调整粉煤灰细度，分别验证这些影响因素下掺合粉煤灰混凝土的抗压强度。考虑到引水隧道衬砌所处的实际环境，还研究了自然环境对于粉煤灰混凝土抗压强度的影响。研究结果表明：含量为25%的粉煤灰具有更加良好的抗压强度，同时将温度控制在22℃时，选择45 mm的方孔筛且筛余量为25%的粉煤灰细度，更能提升混凝土的抗压强度；粉煤灰会与酸性物质发生反应，所以粉煤灰掺量过多会降低混凝土的抗压强度。     

少熟料早强粉煤灰矿渣复合水泥

０　前言粉煤灰是燃煤电厂排放的废渣，大量利用粉煤灰生产水泥，既可以化废为宝，产生很好的环境效益，又可以较大幅度降低水泥生产成本，产生很好的经济效益。国家为了鼓励大量综合利用粉煤灰，制定了特殊的政策，其用量在３０％以上时，可享受免税优惠。但因粉煤灰活性较低，掺入硅酸盐水泥后，水泥强度下降较快，尤其早期强度下降更明显，限制了粉煤灰利用率的提高。国标允许在“粉煤灰水泥”中粉煤灰掺量为２０～４０％，生产实际中掺量一般仅为２０％左右，所制成的４２５＃粉煤灰水泥尽管熟料用量高达７０％左右，而早期强度仍偏低，…     

粉煤灰细度对水泥胶砂性能的影响

本文探讨了粉煤灰的细度对水泥胶砂的部分性能如需水量、强度、干缩以及抗硫酸盐侵蚀性能的影响。除了选用的原状粉煤灰外．利用筛分和分离技术，本文还配制了另外五种粉煤灰，试验过程中粉煤灰替代水泥的用量为40％。试验结果表明，腔砂强度与粉煤灰的细度有直接关系，粉煤灰越细，胶砂试件的抗压强度越高；使用细度小的粉煤灰后。胶砂试件的干缩应变变小，由于粉煤灰中粗颗粒需水量大，因此细粉煤灰有助于改善干缩性能；除粒径最粗粉煤灰外，掺入粉煤灰可以改善抗硫酸盐侵蚀性能。以上试验说明，较细的粉煤灰具备更好的活性，也更能改善胶砂试件的力学性能。     

粉煤灰烧结机理探讨

发展全粉煤灰烧结砖是大量利用原状粉煤灰最有效的途径之一。本文通过试验对粉煤灰烧结机理进行了探讨，为全粉煤灰烧结砖的烧结控制提供了理论依据     

三峡工程Ⅰ级粉煤灰质量标准的现场有效控制

三峡二期工程混凝土总量约1700万方，使用Ⅰ级粉煤灰约75万t，由于粉煤灰量大，供货厂家多，为防止劣质产品的混入，制定了TGPS04－1998“用于水泥混凝土中的粉煤灰”Ⅰ级粉煤灰质量控制标准，为三峡工程统一质量标准提供了可靠的依据。     

简讯：

6月6日，南京市发展和改革委员会、南京市质量技术监督局联合发出了《关于加强商品粉煤灰质量监督管理的通知》。有鉴于外地已经发生由于利用假粉煤灰造成的重大影响事件，为进一步加强全市商品粉煤灰生产、使用的监督管理，确保建材产品和建筑工程质量安全，要求全市范围内粉煤灰综合利用企业，必须依法使用经质量检测合格的商品粉煤灰，并以此作为年终审核、认定粉煤灰综合利用企业和享受减免税、减免养路费等粉煤灰综合利用优惠政策的重要依据。     

以粉煤灰为改性组份的石膏粉煤灰胶结材研究

在石膏体系中掺入适量粉煤灰，通过对粉煤灰活性的充分激发，可显著改善石膏建材的微结构与耐水性。研究了石膏粉煤灰胶结材（以下简称ＧＦＢ）的配制原理与方法，胶结材性能及应用，分析了胶结材水化硬化特点及粉煤灰的改性作用。为同时利用两种废渣、扩大粉煤灰在建材工业中的应用提供了一条新途径。     

适应生产需要改革水泥厂掺灰工艺

本文介绍了粉煤灰作水泥混合材的使用情况以及旧厂设施如何改造更适于掺用粉煤灰，为同类企业改加粉煤灰提供了参改依据     

Effects of particle size on microstructure and mechanical strength of a fly ash based ceramic membrane

Recycling fly ash for ceramic membrane fabrication not only reduces solid waste discharge, but also decreases the membrane cost. Now, fly ash is becoming a promising substitute material for ceramic membrane preparation. A significant difference between fly ashes from different plants is the particle size, which makes performances of fly ash membranes unpredictable. The novelty of this work is to clarify the effects of the particle size of fly ash on ceramic membranes, thereby giving practical suggestions on fly ash selection for ceramic membrane preparation. Ceramic membranes were fabricated with different sizes of fly ashes. Effects of particle size on porosity, pore size, microstructure, mechanical strength and gas permeability of the membrane were investigated. Results indicate that a broader particle size distribution of fly ash leads to a denser structure of membrane with a lower porosity. Pore size and gas permeability of membrane increase while bending strength decreases with the particle size increasing. Bending strength of a fly ash membrane is largely determined by large particles in the fly ash because the large particles lead to cracks in the membrane. This work provides experimental bases for developing high performance ceramic membranes from fly ash.     

Hydration of fly ash cement

It is necessary to establish the material design system for the utilization of large amounts of fly ash as blended cement instead of disposing of it as a waste. Cement blended with fly ash is also required as a countermeasure to reduce the amount of CO₂ generation. In this study, the influences of the glass content and the basicity of glass phase on the hydration of fly ash cement were clarified and hydration over a long curing time was characterized. Two kinds of fly ash with different glass content, one with 38.2% and another with 76.6%, were used. The hydration ratio of fly ash was increased by increasing the glass content in fly ash in the specimens cured for 270 days. When the glass content of fly ash is low, the basicity of glass phase tends to decrease. Reactivity of fly ash is controlled by the basicity of the glass phase in fly ash during a period from 28 to 270 days. However, at an age of 360 days, the reaction ratios of fly ash show almost identical values with different glass contents. Fly ash also affected the hydration of cement clinker minerals in fly ash cement. While the hydration of alite was accelerated, that of belite was retarded at a late stage.     

Influence of fly ash fineness on strength, drying shrinkage and sulfate resistance of blended cement mortar

In this paper, the influence of fineness of fly ash on water demand and some of the properties of hardened mortar are examined. In addition to the original fly ash (OFA), five different fineness values of fly ash were obtained by sieving and by using an air separator. Two sieves, Nos. 200 and 325, were used to obtain two lots of graded fine fly ash. For the classification using air separator, the OFA was separated into fine, medium and coarse portions. The fly ash dosage of 40% by weight of binder was used throughout the experiment. From the tests, it was found that the compressive strength of mortar depended on the fineness of fly ash. The strength of mortar containing fine fly ash was better than that of OFA mortar at all ages with the very fine fly ash giving the highest strength. The use of all fly ashes resulted in significant improvement in drying shrinkage with the coarse fly ash showing the least improvement owing primarily to the high water to binder ratio (W/B) of the mix. Significant improvement of resistance to sulfate expansion was obtained for all fineness values except for the coarse fly ash where greater expansion was observed. The resistance to sulfuric acid attack was also improved with the incorporation of all fly ashes. In this case the coarse fly ash gave the best performance with the lowest rate of the weight loss owing probably to the better bonding of the coarse fly ash particles to the cement matrix and less hydration products. It is suggested that the fine fly ash is more reactive and its use resulted in a denser cement matrix and better mechanical properties of mortar.     

我国粉煤灰利用研究的进展

评述了近几年来粉煤灰基础研究的有关进展，介绍了粉煤灰在高性能混凝土（ＨＰＣ）、新型胶凝材料、建筑制品方面的应用及粉煤灰的特殊用途，在此基础上，提出了今后利用粉煤灰的意见     

浅析中国粉煤灰的综合利用现状

粉煤灰是火力发电厂煤粉在锅炉中燃烧后排出的灰色粉状废弃物。随着对煤炭资源需求的持续增加,粉煤灰排放量也与日俱增。适当加工和利用粉煤灰,减少环境污染,已成为越来越多人关注的问题。阐述了粉煤灰的理化性质,介绍了粉煤灰在建材、农业、化工和环境保护中的应用,并针对中国粉煤灰的综合利用提出了建议。     

飞灰快速水化团聚颗粒的热态磨耗研究

利用热态磨耗实验台研究快速水化团聚颗粒在流化床中热态条件下的磨耗特征.研究表明,飞灰团聚用水量、添加剂用量和流化速度是影响飞灰团聚颗粒磨耗速率大小的关键因素.随着流化速度的降低和添加剂用量的提高,团聚颗粒的磨耗速率降低.飞灰团聚用水量在40%左右时,团聚颗粒磨耗速率最低.亦即在上述条件下团聚颗粒在流化床中停留时间相对较长,进而飞灰碳降低的幅度和自由氧化钙的利用率可能较大.     

粉煤灰回收氧化铝工艺研究进展

粉煤灰是火力发电行业煤炭燃烧工业的副产品,是中国固体废弃物污染的主要来源。粉煤灰富含氧化铝,所以又是潜在的铝土矿的替代品。从粉煤灰中提取氧化铝不仅可以减少粉煤灰对环境的污染,而且能缓解中国铝土资源短缺的问题。对粉煤灰性质、危害、粉煤灰利用现状以及中国铝土资源现状做了分析,论证了粉煤灰提取氧化铝的必要性;详细介绍了石灰石烧结法、硫酸铵烧结法和一步酸溶法的工艺路线、建设生产情况及各工艺的优缺点,为粉煤灰提取氧化铝的发展提出建议,并呼吁加强粉煤灰提取铝工艺方法的研究力度。     

Influence of fly ash and its mean particle size on certain engineering properties of cement composite mortars

An experimental investigation on the effects of incorporating large volumes of fly ash on the early engineering properties and long-term strength of masonry mortars is reported. The effect of fly ash and its mean particle size (PD) on the variation of workability and strength has been studied. It was found that fly ash and its mean particle size play a very significant role on the strength of masonry mortars. It has been observed that the early-term strength, except the mortars incorporating coarse fly ash (CFA), was slightly influenced by the replacement with fly ash. The long-term strength (both the bond strength and the compressive strength) will significantly increase, especially for the bond strength of mortars incorporating coarse fly ash. It was also found that the bond strength significantly increased as the mean particle size of fly ash decreases after 28 days curing. However, the 7-day strength was little influenced by fly ash particle size. The fluidity of composite mortar enhanced due to replace cement and lime with fly ash, and the mean PD of fly ash significantly influenced the workability.     

粉煤灰高附加值利用研究进展

粉煤灰是火电厂燃煤过程中产生的固体残渣, 其成分复杂, 具有毒性, 若处理不当会对环境造成危害。因此, 粉煤灰的高附加值利用迫在眉睫。然而, 粉煤灰的品质是制约其高附加值利用的主要因素。目前, 中国粉煤灰品质参差不齐, 缺少完善的品质评价体系, 由此造成粉煤灰利用领域的局限性。针对上述问题, 首先分析了中国粉煤灰的资源化特性, 总结了粉煤灰的品质评价方法, 并重点阐述了适用于粉煤灰高附加值利用的品质评价方法;其次, 详细介绍了粉煤灰高附加值利用技术（高附加值提取技术、高附加值材料制备技术）;最后, 对粉煤灰高附加值利用的发展趋势做出了展望。     

粉煤灰脱炭研究进展及展望

为了提高粉煤灰质量,实现粉煤灰的高效脱炭技术发展,促进粉煤灰资源可回收利用,介绍了粉煤灰脱炭的3种方法,即浮选法、重选法和电选法,其中,浮选法主要依据矿物的表面性质对粉煤灰进行脱炭;重选法依据矿物密度性质的差异对粉煤灰进行脱炭分离;电选法则依据矿物摩擦带电性质的不同进行分选。同时,对粉煤灰脱炭方法的发展趋势进行了展望,建议未来应深入研究粉煤灰性质,将脱炭方法与新型选矿设备相结合进行工业化生产,创新结合方式,如采取活性油泡与旋流静态微泡浮选柱结合的方式对粉煤灰进行脱炭处理。