应用消石灰提高沥青路面的水稳定性

在沥青混合料中添加消石灰能有效地提高抗水损害能力，提高路面的耐久性。虽然消石灰以稀浆加入效果较好，但以替代矿粉的方式使用，更现实可行。     

消石灰对温拌沥青混合料水稳定性的影响研究

采用间接拉伸强度试验方法,评估了不同掺量的消石灰(0~2%)对温拌沥青混合料水敏感性的影响。结果表明,提高消石灰的掺量降低了密级配温拌沥青混合料(WMA)的水敏感性,对未掺加消石灰的聚合物改性沥青间断级配(SMA)试件,其抗拉强度比(TSR)满足AASHTO规范大于80%的要求。     

沥青混合料水稳定性改善研究

水损坏是沥青路面早期破损的主要原因之一,直接关系到路面的使用性能.本研究对不同消石灰掺量的沥青混合料开展水稳定性试验,确定最佳消石灰掺量为1.3％;对采用基质沥青、掺加抗剥落剂的沥青进行黏附性试验对比分析,发现掺加抗剥落剂的沥青与集料的黏附性更佳.在条件允许的情况下,建议采用掺入消石灰和抗剥落剂的双重措施来保证含酸性集...     

改性沥青的紫外老化研究

我国大部分地区尤其是西部地区日照时间长,太阳光谱中紫外线比例高,而紫外辐射同样也会导致沥青的老化。对传统基质沥青和SBS、消石灰、反应型三元共聚物(RET)及多聚磷酸(PPA)改性沥青的紫外老化特性进行了研究。试样的降解使用傅里叶变换红外光谱和热分析进行了分析,从红外光谱结果可以看出,当紫外老化200 h时,SBS、多聚磷酸(PPA)和消石灰改性沥青与传统基质沥青相比表现出更高的耐光降解能力。SBS改性沥青和消石灰改性沥青,老化后最大降解率的温度和降解终止温度增加。     

掺加消石灰的沥青混合料抗水损害性能试验研究

结合盐通高速公路实际情况，采用冻融劈裂试验方法，对中上面层沥青混合料中添加消石灰、液体抗剥落剂进行了水稳定性试验比较，比较结果表明掺加消石灰后对改善沥青混合料的水稳定性有很明显的效果。根据研究结论，在盐通高速公路中下面层全线进行了推广，其长期应用效果将继续跟踪观测。     

臭氧氧化协同半干法同时脱硫脱硝在烧结机烟气工业的应用

以70×10~4 m~3/h烧结烟气为例,研究了工程实际应用中O_3对烟气的氧化和半干法对NO_x的吸收等问题。试验结果表明,O_3与烟气中NO的反应速率快。O_3氧化的关键因素是提高O_3在烟道内的分布,增加O_3的利用率。温度对半干法吸收NO_x有显著影响。随着脱硫塔温度的升高,NO_x的吸收效率持续降低,当温度高于95℃时,脱硝效率为0。通过增加消石灰量和增加O_3用量可提高脱硝效率。从工艺运行情况来看,该工艺脱硝成本不高,值得进一步推广应用。     

使用消石灰对沥青混合料性能的影响

沥青路面水损害的根本原因是沥青从集料上发生了剥落.试验表明,用消石灰取代部分矿粉,可以有效地增强沥青抗剥落性能,同时还可以改善沥青混合料的抗车辙能力、抗疲劳能力以及抗老化能力.     

冬用压延机油缩短生产周期的经验

压延机油是我国铜铁工业不可缺少的润滑脂,我厂已往生产周期较长,产量低,根据当前我国工农业生产大跃进的发展速度看来,如不改变操作条件,则很难满足需要。为此,我工段全体职工,在党的正确领导下大闹技术革命,苦鑽苦研,摸索出了一些操作经验,其主要方面是: 1.加消石灰皂化时间短,大开汽使水分蒸发     

环氧装置废水预处理工艺流程改造

环氧装置废水预处理系统废水排放量大,废水中悬浮物含量高,控制不稳定。通过工艺流程改造,使得一次澄清水与二次澄清水、压滤机滤液进行分离,减少废水中悬浮物的含量。悬浮物含量少的一次澄清水直接用于配制消石灰和废水机泵密封水、地面冲洗水。一次澄清水经过循环水冷却后,也可以用于压滤机滤布清洗水。这样,可以达到节水减排、降低废水悬浮物含量的目的。     

石油沥青 2003年目次索引(括号内数字为期数·页数)

·综　　述·我国沥青生产形势和品种结构调整　陈惠敏 ( 1 .1 )……………………………………………对我国五省乳化沥青技术应用情况的调查分析　牛润莲 ( 2 .1 )……………………………………………聚合物改性沥青的储存稳定性　钱　科　傅大放　刘举正 ( 3 .1 )………………………关于沥青针入度指数　陈惠敏 ( 4 .1 )……………………………………………·试验与研究·应用消石灰提高沥青路面的水稳性　郑晓光　吕伟民 ( 1 .7)…………………………………大空隙沥青混合料配合比设计　刘红瑛 ( 1 .1 0 )…………………………………………     

THE INFLUENCE OF METAL-CONTAINING COMPOUNDS ON ENHANCEMENT AND INHIBITION OF ASPHALT OXIDATION

Addition of lime to paving asphalts is known to inhibit oxidative aging of pavements. The mechanism of the action of lime in retarding oxidation is not known. In this work, an asphalt was mixed with a vanadium chelate that is known to strongly promote oxidation in asphalts. This enhancement of oxidation was largely neutralized when the mixtures were combined with hydrated lime. It is possible that lime acts by suppressing the catalytic activity of naturally occurring vanadium compounds that occur in almost all asphalts, although other mechanisms for the action of lime are also possible. The use of vanadium compounds in asphalt aging tests also is discussed.     

A STUDY OF RHEOLOGICAL PROPERTIES OF LIME TREATED PAVING ASPHALTS AGED AT 60°C IN A PRESSURE AGING VESSEL

Abstract

The oxidation and age-hardening propensities of eight widely varying petroleum asphalts used for paving were studied with and without hydrated lime, and with inert particulate matter in place of lime. The results show that oxidation of sulfides to sulfoxides and benzyl carbon to ketone is affected very little by the presence of lime. However, the addition of lime does inhibit age-hardening in asphalt whereas the inert particulate matter in the same amount and particle size has little effect other than the filler effect exhibited by the lime and the inert particulate.

The principal inhibition of age-hardening of asphalt by hydrated time occurs at high pavement temperatures (> 60°C). At low and moderate temperatures (<50°C), age-hardening is very slow and typically not a major problem in pavement.

It is speculated elsewhere in detailed aging studies that the high temperature age-hardening of paving asphalts results from formation of multimolecular, three dimensional matrices in asphalt formed among polar molecules. Hydrated lime appears to interfere with this type of matrix formation, probably by chemical reaction with carboxylic and other acids, to reduce the sizes and/or strengths of the matrices. As a practical result, lime reduces the rate of hardening of asphalt hence prolonging the expected lifetime of a roadway.     

THE INFLUENCE OF METAL-CONTAINING COMPOUNDS ON ENHANCEMENT AND INHIBITION OF ASPHALT OXIDATION

ABSTRACT

Addition of lime to paving asphalts is known to inhibit oxidative aging of pavements. The mechanism of the action of lime in retarding oxidation is not known. In this work, an asphalt was mixed with a vanadium chelate that is known to strongly promote oxidation in asphalts. This enhancement of oxidation was largely neutralized when the mixtures were combined with hydrated lime. It is possible that lime acts by suppressing the catalytic activity of naturally occurring vanadium compounds that occur in almost all asphalts, although other mechanisms for the action of lime are also possible. The use of vanadium compounds in asphalt aging tests also is discussed.     

The Effect of Hydrated Lime on the Bond Between Asphalt and Recycled Concrete Aggregates

In this investigation, rolling bottle tests and boiling water tests were performed to evaluate the effect of hydrated lime on the adhesion between recycled concrete aggregates (RCA) and the asphalt binder. RCA from construction and demolition waste (C&DW) were used in this investigation. To generalize the findings, three asphalt penetration grades were analyzed: B40/50, B60/70, and B150/200. The results indicate that the use of hydrated lime does not improve the RCA-aggregate bond. Additionally, the results indicate that a higher asphalt-aggregate adhesion correlates to a lower asphalt penetration grade.     

Rheological properties of hydroxide and calcium oxide nanoparticles in asphalt binder

The authors aimed to study the incorporation of calcium hydroxide (hydrated lime) and calcium oxide (lime virgin) in nanodimensions in order to increase the durability of pavements and reduce permanent deformation damage. In this research the authors included, in order to achieve the proposed objectives, information contained in the current literature as well as laboratory tests. These results demonstrate that the addition of nanoparticulate agents to asphalt binder is effective alternative in an attempt to improve the properties thereof for use in paving, with calcium oxide or quicklime in a 5% strength modifier, which showed significant enhancements.     

页岩气热解油基钻屑残渣路基填料的制备及其性能研究

目的为探索页岩气热解油基钻屑残渣路基填料的可行性,采用石灰和粉煤灰作为复合材料,进行油基钻屑改性研究。 方法比较不同矿物材料复配比例及掺量对改良残渣无侧限抗压强度和污染物浸出特性的影响效果,探究了残渣替代天然土的比例对改性路基填料击实特性和CBR值的影响规律。 结果残渣固化后的无侧限抗压强度(7天)、CBR值分别可达3.93 MPa和15.5%,浸出液污染物均达到GB 8978-1996《污水综合排放标准》要求。 结论复合矿物材料水化生成的水化硅酸钙、水化铝酸钙、氢氧化钙、碳酸钙和矿物材料自身均对重金属离子具有固化稳定作用,因此,对污染物可实施有效封堵和吸附,从而抑制污染物的浸出,同时可使固化体结构致密化,承载力得以提高,该体系具有良好的应用前景。 