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Influence of Thermally Treated Flue Gas Desulfurization(FGD) Gypsum on Performance of the slag powder Concrete

Journal of Wuhan University of Technology(Materials Science) 2013年第6期28卷 1122-1127页

作者： GUO Xiaolu SHI Huisheng Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education Tongji University Environmental Materials Institute

The feasibility of flue gas desulphurization （FGD） as concrete admixture was studied. A combined concrete admixture of the thermally-treated FGD gypsum and slag powder was explored. The FGD gypsum was roasted at 200℃ for 60 min and then mixed with the slag powder to form FGD gypsum-slag powder combined admixture in which the SO3 content was 3.5wt%. Cement was partially and equivalently replaced by slag powder alone or FGD gypsum-slag powder, at concentration of 25wt%, 40wt%, and 50wt%, respectively. The setting times, hydration products, total porosity and pore size distributions of the paste were determined. The compressive strength and drying shrinkage of cement mortar and concrete were also tested. The experimental results show that, in the presence of FGD gypsum, the setting times are much slower than those of pastes in the absence of FGD gypsum. The combination of FGD gypsum and slag powder provides synergistic benefits above that of slag powder alone. The addition of FGD gypsum provides benefit by promoting ettringite formation and forms a compact microstructure, increasing the compressive strength and reduces the drying shrinkage of cement mortar and concrete.

关键词： flue gas desulfurization (FGD) gypsum slag powder compressive strength drying shrinkage mortar concrete

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Mechanical Properties and Microcosmic Properties of Self-Compacting Concrete Modified by Compound Admixtures

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Journal of Renewable Materials 2022年第4期10卷 897-908页

作者： Song Yang Bing Qi Zubin Ai Zhensheng Cao Shiqin He Lijun Li Power China Roadbridge Group Co. Ltd.Beijing100048China College of Civil Engineering North China University of TechnologyBeijing100043China Sichuan Tieke New Building Materials Co. Ltd.Chengdu610000China

It has become a research hotspot to explore raw material substitutes of *** is important to research the mechanical properties of self-compacting concrete(SCC)with slag powder(SP)and rubber particle(RP)replacing cement and coarse aggregate,respectively.12 kinds of composite modified self-compacting concrete(CMSCC)specimens were prepared by using 10%,20%and 30%SP and 30%,40%,50%and 60%*** rheological properties,mechanical properties and microstructure of the CMSCC were *** indicate that the workability,compressive strength,splitting tensile strength and flexural strength of CMSCC prepared by 20%SP and less than 40%RP are *** order to maximize the utilization of waste materials,20%SP and 40%RP can be used as the optimal ratio of the combined *** microstructure shows that the addition of proper amount of SP is conducive to the formation of increasingly more uniform C-S-H gel.C-SH gel can fill the internal pores of the sample and enhance the adhesion between the aggregate,thus improving the mechanical properties of *** has a rougher surface and lower density and stiffness,which inhibits the workability and mechanical properties of *** above research results have important theoretical and practical significance for the selection of raw materials of self-compacting concrete and the rational use of industrial wastes.

关键词： Self-compacting concrete slag powder rubber particle mechanical properties microstructure

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Analysis on Pore Structure of Non-Dispersible Underwater Concrete in Saline Soil Area

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Journal of Renewable Materials 2021年第4期9卷 723-742页

作者： Fang Liu Baomin Wang Mengsai Wang Xiaosa Yuan Shaanxi Key Laboratory of Safety and Durability of Concrete Structures Xijing UniversityXi’an710123China School of Civil Engineering Dalian University of TechnologyDalian116023China

In this paper,mercury intrusion porosimetry(MIP)is used to test the pore structure of non-dispersible underwater concrete so as to study the influence of pouring and curing environment,age and slag powder on the pore characteristics of concrete,analyze the pore characteristics,porosity and pore distribution of concrete in different hydration stages,and reveal the relationship between pore structure and permeability of *** results show that the pore-size distribution of concrete in fresh water condition is better than that in sulfate environment and mixed salt environment,and therefore,sulfate as well as mixed salt are not conducive to the development of pore structure of non-dispersible underwater concrete;chlorine salt has little effect on the pore structure of nondispersible underwater concrete;under the three conditions of sulfate,chlorine and mixed salt,the porosity of concrete mixed with slag powder is lower than that of concrete without slag *** results indicate that the addition of slag powder can ameliorate the pore size distribution of non-dispersed underwater concrete,reduce the porosity,and make the concrete structure more compact,which is beneficial to improve the permeability resistance of concrete at the macro level.

关键词： Non-dispersible underwater concrete slag powder saline soil mercury intrusion porosimetry(mip) pore structure

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粉煤灰矿粉双掺混凝土试验研究

粉煤灰矿粉双掺混凝土试验研究

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第六届全国高强与高性能混凝土学术交流会

作者：姜福香赵铁军张纪刚万小梅张鹏青岛理工大学土木工程学院青岛理工大学校长办公室青岛理工大学土木工程学院青岛理工大学土木工程学院青岛理工大学土木工程学院

＜正＞一、前言混凝土结构的耐久性不足已经成为困扰土木工程界的世界性难题。采用活性混合材取代部分水泥,从而使混凝土材料高性能化,是提高混凝土耐久性的最佳方法。而粉煤灰和磨细矿粉现已作为最经济的活性混合材广泛地应用于生产中... 详细信息

＜正＞一、前言混凝土结构的耐久性不足已经成为困扰土木工程界的世界性难题。采用活性混合材取代部分水泥,从而使混凝土材料高性能化,是提高混凝土耐久性的最佳方法。而粉煤灰和磨细矿粉现已作为最经济的活性混合材广泛地应用于生产中,成为有效改善混凝土力学和耐久性能的第六组分。采用粉煤灰和矿粉代替部分水泥,不但能改善新拌混凝土的流动性、提

关键词： concrete fly ash slag powder durability experimental study

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