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Effects of GH Admixture on the Early Strength of fly ash concrete and Mortar

Journal of Wuhan University of Technology(Materials Science) 2008年第5期23卷 755-760页

作者：亢景付 School of Civil Engineering Tianjin University

The enhancement effects of GH admixture on the early strengths of fly ash concrete and mortar were studied, and the mechanism was analyzed by X-ray diffraction （XRD） and scanning electro microscope （SEM）. Experimental results show that, by the incorporation of GH admixture, both of cement hydration and pozzolanic reaction of fly ash are accelerated, the strengths of fly ash concrete and mortar are enhanced noticeably, especially the early strength. With a mixture design of 200 kg/m^3 OPC （Ordinary Portland Cement ）, 200 kg/m^3 fly ash and 50 kg/m^3 GH admixture, the strength of concrete at 1 d, 3 d and 28 d reaches 25 MPa, 50 MPa and 70 MPa respectively.

关键词： building materials fly ash concrete GH admixture strength microstructure

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BOND PERFORMANCE EXPERIMENT FOR fly ash concrete AND STEEL BAR

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Transactions of Nanjing University of Aeronautics and Astronautics 2012年第3期29卷 302-306页

作者：王倩吴瑾南京航空航天大学航空宇航学院

The impact of fly ash content on bond performance of steel bars and their surrounding concrete is studied by means of sticking strain gauges on steel bars. The average bond stress-slip curves, the steel strain-anchor location curves, and the bond stress-anchor position curves of the pullout specimens with various fly ash contents are obtained. Results indicate that the bond performance of concrete and steel bars can be improved and the distribution of steel strain along the anchorage length tends to be more uniform by adding fly ash in concrete specimens, and both ultimate bond stress and ultimate slip deformation increase the most when 20% of specimens′ content is fly ash.

关键词： fly ash concrete bond performance fly ash content bond stress distribution

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High-Volume fly ash concrete-A Relevant Step to Sustainable Development

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Journal of Environmental Science and Engineering(A) 2014年第5期3卷 257-267页

作者： Malgorzata Lelusz Faculty of Civil and Environmental Engineering Bialystok University of Technology Bialystok 15-351 Poland

HVFA （high-volume fly ash） concrete could be a sustainable way for by-product utilization to conserve natural resources and protect environment. HVFA concrete can play the role of a high-performance material that may be comparable to the conventional Portland cement concrete. The results of the research programme concerning the relationships between the composition of concrete （w/b ratio, fly ash content and type of cement） and their physical and mechanical properties are presented and discussed in the paper. It is found that the introduction of high-volume fly ash into concrete has caused a decrease in compressive strength at the early age of storage. The significant increase in strength was observed between 28 days and 90 days of curing. The high-volume fly ash concretes were characterized with lower water absorbability and sorptivity than control concrete.

关键词： fly ash concrete high-volume fly ash strength development.

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Effect of CSH Crystal Nucleus on Steam-Free Cured fly ash Precast concrete Components

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Journal of Renewable Materials 2023年第9期11卷 3485-3500页

作者： Ruyi Luo Yanyan Hu Tingshu He Xiaodong Ma Yongdong Xu College of Materials Science and Engineering Xi’an University of Architecture&TechnologyXi’an710055China

The measures of steam curing and early-strengthening agents to promote the precast components to reach the target strength quickly can bring different degrees of damage to the *** on this,the new nanomaterial CSH-the hydration product of cement effectively solves these measures’disadvantages,such as excessive energy consumption,thermal stress damage,and the introduction of external *** this paper,the effect of CSH on the early strength of precast fly ash concrete components was investigated in terms of setting time,workability,and mechanical properties and analyzed at the microscopic level using hydration temperature,XRD,and *** results showed that under the same workability,CSH could significantly reduce the amount of admixture,shorten the final setting time,almost not affect the initial setting time,and accelerate the hydration of *** the optimum dose of 5%,the mechanical properties of the specimens were improved by more than 98%within 12 h of hydration,resulting in an earlier release time of 12 h and no risk of strength inversion *** results of this paper give theoretical support to the behavior of precast components under steam-free curing.

关键词： fly ash concrete prefabricated components steam-free curing CSH crystal nucleus tobermorite

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THE REALIZATION OF fly ash concrete EXPERT SYSTEM

THE REALIZATION OF FLY ASH CONCRETE EXPERT SYSTEM

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第五届水泥与混凝土国际会议

作者： Yang Qian-rong,Zhang Ling-yi,Wu Xue-li (School of Materials Science and Engineering,Tongji University,Shanghai 200092,China Shanghai Jinqian Network Corp. ,Shanghai 200040,China)

In this paper, the aurthors describe the elements and realization of fly ash cncrete expert system. The functions and the characteristics of software designing of SHFACES are also presented.

关键词： fly ash concrete expert system knowledge base inference engine rule

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兰州市粉煤灰混凝土的应用研究

兰州市粉煤灰混凝土的应用研究

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全国高强与高性能混凝土及其应用专题研讨会

作者：刘翠兰张风臣陈拥军兰州理工大学土木工程学院

＜正＞粉煤灰作为一种宝贵资源,世界各国都很重视它的利用,一些发达国家粉煤灰资源化率相当高,如荷兰达到100%,意大利为92%,丹麦为90%。我国已成为粉煤灰排放第一大国,年排放量超过1.6亿吨,年利用率仅40%左右。在国家政策的指导下,我国... 详细信息

＜正＞粉煤灰作为一种宝贵资源,世界各国都很重视它的利用,一些发达国家粉煤灰资源化率相当高,如荷兰达到100%,意大利为92%,丹麦为90%。我国已成为粉煤灰排放第一大国,年排放量超过1.6亿吨,年利用率仅40%左右。在国家政策的指导下,我国粉煤灰综合利用率不断提高,但各个省市的利用率差别相当大,甘肃省的粉煤灰的利用处于落后的水平。在所有粉煤灰的应用中,用在混凝土中的量相当大,已成为混凝土必不可少的成分,正如一些学者认为,必须把粉煤灰作为除水、水泥、集料外的第四组分。在兰州大力推广应用粉煤灰混凝土是提高粉煤灰资源化率的有效途径之一。

关键词： fly ash concrete fly ash content Optimization of concrete mixes Strength Shrinkage

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