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Effect of mineral additives and permeability reducing admixtures having different action mechanisms on

《结构与土木工程前沿（英文）》 2021年第15卷第5期页码 1277-1291 doi: 10.1007/s11709-021-1752-2

摘要： In this paper, the effect of usage of the permeability reducing admixture (PRA) having different action mechanisms on hardened state properties of cementitious systems containing mineral additives is examined. For this aim, three commercial PRAs were used during investigation. The effective parameters in the first and third PRAs were air-entraining and high-rate air-entraining, respectively. The second one contained the insoluble calcium carbonate residue and had a small amount of the air-entraining property. Mortar mixes with binary and ternary cementitious systems were prepared by partially replacing cement with fly ash and metakaolin. The hardened state properties of mortar mixtures such as compressive strength, ultrasonic pulse velocity, water absorption, drying shrinkage and freeze–thaw resistance were investigated. The ternary cement-based mixture having both fly ash and metakaolin was selected as the most successful mineral-additive bearing mix in regard to hardened state properties. In this sense, PRA-B, with both insoluble residues and a small amount of air-entraining properties, showed the best performance among the mixtures containing PRA. The combined use of mineral additive and PRA had a more positive effect on the properties of the mixes.

关键词： cementitious system mineral additive permeability reducing admixture mechanical properties durability performance

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Effect of nonionic side chain length of polycarboxylate-ether-based high-range water-reducing admixture

Süleyman ÖZEN, Muhammet Gökhan ALTUN, Ali MARDANI-AGHABAGLOU, Kambiz RAMYAR

《结构与土木工程前沿（英文）》 2020年第14卷第6期页码 1573-1582 doi: 10.1007/s11709-020-0680-x

摘要： Despite the large variations in the behaviors of water-reducing admixtures upon changes in their structures, most previous reports on the cement-admixture compatibility did not provide sufficient information on the structure of the admixture. Hence, the evaluation and generalization of the reports on the cement-admixture compatibility are challenging. In this study, three different polycarboxylate-ether-based water-reducing admixtures with the same free nonionic content, anionic/nonionic molar ratio, and main chain length and different side chain lengths were produced. The compatibility of these admixtures with a CEM I 42.5R-type cement was investigated. In addition, an analysis of variance was performed on the experiment results to evaluate the contributions of the admixture type, admixture/cement ratio, and elapsing time to the Marsh funnel flow time, mini-slump, slump flow, and compressive strength. The water-reducing admixtures having long or short side chains reduced the initial flow characteristics of the cementitious systems. However, the admixture having the shortest side chain was better with regard to flow retention. The side chain length of the admixture did not have significant effects on the compressive strength and water absorption capacity of the mortar mixtures and mini-slump performances of the cement paste mixtures. Regarding the behaviors of the admixtures in the cementitious systems, an optimal admixture side chain molecular weight is proposed.

关键词： water-reducing admixture side chain length cement paste fluidity compressive strength

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Feasibility of crack free reinforced concrete bridge deck from materials composition perspective: a state of the art review

Mahdi AREZOUMANDI

《结构与土木工程前沿（英文）》 2015年第9卷第1期页码 91-103 doi: 10.1007/s11709-015-0274-1

摘要： Early age cracking on bridge deck has been the subject of many studies for years. Cracking is a major concern because it leads to premature deterioration of structures. Millions of dollars spent to repair the cracked bridge decks each year. To design an appropriate mixture for crack free bridge deck, it is important to study previous researches. This paper presents a comprehensive literature review of the performance of different materials compositions as well as methods have been used to reduce and control bridge deck cracks. Different material compositions and methods are discussed in terms of their performances as well as advantages and disadvantages.

关键词： bridge deck crack fiber shrinkage shrinkage reducing admixture

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聚羧酸系减水剂在客运专线工程中的应用研究

黄直久

《中国工程科学》 2009年第11卷第1期页码 75-80

摘要：

介绍聚羧酸系减水剂在满足铁路客运专线高性能混凝土综合性能方面的能力和特点，分析了工程应用中使用聚羧酸系减水剂存在的一些问题。提出解决聚羧酸系减水剂与水泥的相容性问题以及保持聚羧酸系减水剂本身质量稳定性是目前该减水剂应用的关键。

关键词：聚羧酸系减水剂水泥的相容性质量稳定性高性能混凝土

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Degradation of permeability resistance of high strength concrete after combustion

LI Min, QIAN Chunxiang, KAO Hongtao

《结构与土木工程前沿（英文）》 2008年第2卷第3期页码 281-287 doi: 10.1007/s11709-008-0031-9

摘要： To evaluate the remaining durability of concrete materials after combustion, the permeability of high strength concrete (HSC) after combustion was studied. The transport behavior of chloride ion, water and air in concrete after combustion and the effect of temperature, strength grade, and aggregation on the permeability of HSC after combustion are investigated by chloride ion permeability coefficient (), water permeability coefficient () and air permeability coefficient (). The experiment results show that all three permeability coefficients commendably reflect changes of permeability. The permeability coefficient increases with the evaluation temperature. After the same temperature, the permeability coefficient of HSC is lower than that of normal strength concrete (NSC). However, the degree of degradation of permeability coefficient of HSC is greater than that of NSC. The permeability resistance of HSC containing limestone is better than that of HSC containing basalt. Combining changes of compressive strength and permeability, the remaining durability of concrete materials after combustion is appropriately evaluated.

关键词： transport behavior limestone durability permeability HSC

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Analyzing the characterization of pore structures and permeability of diesel contaminated clays under

《结构与土木工程前沿（英文）》页码 1264-1280 doi: 10.1007/s11709-023-0921-x

摘要： In this study, mercury intrusion porosimetry (MIP) and X-ray micro-computed tomography (XRμCT) were used to characterize the pore structures and investigate the permeability characteristics of clay after aging and contamination with diesel. The results of the MIP tests showed that aging leads to reductions in porosity and average diameter, as well as an increase in tortuosity. The XRμCT analysis yielded consistent results; it showed that aging renders pores more spherical and isotropic and pore surfaces smoother. This weakens the pore connectivity. Micromorphological analysis revealed that aging led to the rearrangement of soil particles, tighter interparticle overlapping, and a reduction in pore space. The combination of MIP and XRμCT provided a comprehensive and reliable characterization of the soil pore structure. An increased diesel content increased the porosity and average diameter and reduced the tortuosity of the pores. Mechanistic analysis showed that aging weakens interparticle cohesion; this causes large agglomerates to break down into smaller agglomerates, resulting in a tighter arrangement and a subsequent reduction in porosity. An increase in diesel content increases the number of large agglomerates and pore spaces between agglomerates, resulting in increased porosity. Both aging and diesel content can weaken the permeation characteristics of soil.

关键词： MIP XRμCT aging diesel content pore structure permeability characteristics

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Predictive calculations of gas solubility and permeability in glassy polymeric membranes: An overview

Matteo Minelli, Maria Grazia De Angelis, Giulio C. Sarti

《化学科学与工程前沿（英文）》 2017年第11卷第3期页码 405-413 doi: 10.1007/s11705-017-1615-5

摘要： The possibility to evaluate in a predictive way the relevant transport properties of low molecular weight species, both gases and vapors, in glassy polymeric membranes is inspected in detail, with particular attention to the methods recently developed based on solid thermodynamic basis. The solubility of pure and mixed gases, diffusivity and permeability of single gases in polymer glasses are examined, considering in particular poly(2,6-dimethyl-1,4-phenylene oxide) as a relevant test case. The procedure clearly indicates what are the relevant physical properties of the polymer matrix and of the penetrants required by the calculations, which can be obtained experimentally through independent measurements. For gas and vapor solubility, the comparison with direct experimental data for mixed gases points out also the ability to account for the significant variations that solubility-selectivity experiences upon variations of pressure and/or feed composition. For gas and vapor permeability, the comparison with direct experimental data shows the possibility to account for the various different trends observed experimentally as penetrant pressure is increased, including the so-called plasticization behavior. The procedure followed for permeability calculations leads also to clear correlations between permeability and physical properties of both polymer and penetrant, based on which pure predictive calculations are reliably made.

关键词： solubility permeability glassy polymers NELF model diffusion

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三维编织锥体织物的减纱技术

朱建勋

《中国工程科学》 2006年第8卷第3期页码 66-69

摘要：

研究了由大端直径开始编织三维锥体织物的减纱技术，包括列向、环向减锭减纱、减细纤维束减纱等多种减纱技术及其组合；分析比较了各种减纱技术对织物结构完整性、操作简便性、机械化编织等方面的影响。减细纤维束减纱技术是特殊的环向减锭技术，具有保持织物结构整体完整、工艺操作简便、纱锭运动可实现机械化等优点，但不同纱束直径纤维编织使织物单元结构构造变得复杂多变。

关键词：三维编织锥体织物减锭减纱减细纤维束减纱单元构造

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宏观裂缝混凝土中表观气体渗透率的测定 Article

Pierre Rossi

《工程（英文）》 2022年第17卷第10期页码 93-98 doi: 10.1016/j.eng.2020.11.008

摘要：

本文报道了一项旨在测定开裂混凝土表观气体渗透率的实验研究分析。由于难以对气体渗透率进行可靠的实验测试，国际文献中缺乏对这一问题的研究。本研究的主要目的是提供新颖可靠的实验结果，并提出表观裂缝渗透率演化与表观裂缝张开度之间的解析函数。考虑Poiseuille 定律，这些函数似乎是相关的。

关键词：混凝土宏观裂缝气体传输渗透率

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Preparation and permeability of ZSM-35 zeolite membranes on porous stainless steel tubes

ZHU Gang, WANG Jinqu, ZHANG Yan, LU Jinming, XIU Jinghai

《化学科学与工程前沿（英文）》 2007年第1卷第3期页码 217-220 doi: 10.1007/s11705-007-0039-z

摘要： ZSM-35 zeolite membranes were prepared on porous stainless steel tubes with silica sol and tetraethoxysilane as silica source, and with 1-butylamine and ethylenediamine as templates, respectively. The characterization of X-ray diffraction (XRD) and scanning electron microscopy (SEM) showed that the membranes prepared with ethylenediamine as the template displayed growth orientation with their crystal planes (h00) parallel to the support surface. The single-component permeability tests of H, N and CH showed that the membranes synthesized with ethylenediamine as the template, compared with those with 1-butylamine as the template, showed relatively higher permeation rates and ideal separation factors, and above their corresponding ideal Knudsen diffusion factors, which might be attributed to the different growth orientation of zeolite membranes synthesized with different templates.

关键词： single-component permeability diffusion different permeation orientation

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Uncoupled state space solution to layered poroelastic medium with anisotropic permeability and compressible

Zhiyong AI, Wenze ZENG, Yichong CHENG, Chao WU

《结构与土木工程前沿（英文）》 2011年第5卷第2期页码 171-179 doi: 10.1007/s11709-011-0103-0

摘要： This paper presents an uncoupled state space solution to three-dimensional consolidation of layered poroelastic medium with anisotropic permeability and compressible pore fluid. Starting from the basic equations of poroelastic medium, and introducing intermediate variables, the state space equation usually comprising eight coupled state vectors is uncoupled into two sets of equations of six and two state vectors in the Laplace-Fourier transform domain. Combined with the continuity conditions between adjacent layers and boundary conditions, the uncoupled state space solution of a layered poroelastic medium is obtained by using the transfer matrix method. Numerical results show that the anisotropy of permeability and the compressibility of pore fluid have remarkable influence on the consolidation behavior of poroelastic medium.

关键词： uncoupled state space solution layered poroelastic medium three-dimensional consolidation anisotropic permeability compressible pore fluid

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Removal of Cu(II) and Fe(III) from aqueous solutions by dead sulfate reducing bacteria

Hong’en QUAN, He BAI, Yang HAN, Yong KANG, Jiao SUN

《化学科学与工程前沿（英文）》 2013年第7卷第2期页码 177-184 doi: 10.1007/s11705-013-1324-7

摘要： The biosorption properties of dead sulfate reducing bacteria (SRB) for the removal of Cu(II) and Fe(III) from aqueous solutions was studied. The effects of the biosorbent concentration, the initial pH value and the temperature on the biosorption of Cu(II) and Fe(III) by the SRB were investigated. FTIR analysis verified that the hydroxyl, carbonyl and amine functional groups of the SRB biosorbent were involved in the biosorption process. For both Cu(II) and Fe(III), an increase in the SRB biosorbent concentration resulted in an increase in the removal percentage but a decrease in the amount of specific metal biosorption. The maximum specific metal biosorption was 93.25 mg?g at pH 4.5 for Cu(II) and 88.29 mg?g at pH 3.5 for Fe(III). The temperature did not have a significant effect on biosorption. In a binary metal system, the specific biosorption capacity for the target metal decreased when another metal ion was added. For both the single metal and binary metal systems, the biosorption of Cu(II) and Fe(III) onto a SRB biosorbent was better represented by a Langmuir model than by a Freundlich model.

关键词： sulfate reducing bacteria biosorption Cu(II) Fe(III)

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Permeability testing of drilling core sample from pavement

WANG Suda, TANG Zhengguang, NING Xiaojun, WU Peiguan, XING Pingyi

《结构与土木工程前沿（英文）》 2008年第2卷第4期页码 391-394 doi: 10.1007/s11709-008-0045-3

摘要： The permeability coefficient of pavement material is a very important parameter in designing the drainage of pavement structures and is also used to evaluate the quality of road construction. New equipment is used to measure the permeability coefficient of the pavement drilling core sample and relevant testing methods are introduced. Testing drilling core samples from a certain highway of Yunnan province has been proven to be feasible. The test results are also analyzed.

关键词： province material feasible permeability coefficient equipment

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关于我国地铁建设降低投资问题

施仲衡

《中国工程科学》 2001年第3卷第1期页码 36-39

摘要：

文章本着技术先进，安全可靠，经济实用的原则，对降低地铁造价的可能性进行分析，提出了如下初步设想：充分作好前期准备工作；重视客流预测；考虑提高行车密度；选择合理的车站结构型式和埋深；合理确定车站设备用房和管理用房的面积；重视换乘站的设计；采用合理的车站间距；做好地下线与高架线的选择；隧道埋深、结构尺寸及施工方案的优化；切实贯彻设备国产化政策。

关键词：地铁建设投资降低

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中国低渗透油气的现状与未来

胡文瑞

《中国工程科学》 2009年第11卷第8期页码 29-37

摘要：

中国低渗透油气资源丰富，具有很大的勘探开发潜力。近20年来，在低渗透砂岩、海相碳酸盐岩、火山岩勘探方面取得了很大发现，形成了国际一流的开发配套技术，实现了低渗透油气藏的规模有效开发，低渗透油气产量持续上升，其在产量构成中所占比例逐年增加。无论从近几年新增探明储量还是从剩余油气资源量看，低渗透油气都是今后勘探开发的主要对象，低渗透油气是中国未来油气工业的勘探开发主流，对保障国家能源安全具有重要的战略意义。

关键词：低渗透油气勘探开发主流现状未来技术