第四期_2021_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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第四期

矸石电厂粉煤灰的活化及应用技术 ——评《矸石电厂粉煤灰的活化及应用》

冯月娥

2021年第4期

摘要

引用本文

我国混凝土工程建设飞速发展，水泥用量与日俱增。而生产水泥需要消耗大量能源，这与国家的绿色环保政策背道而驰。矸石电厂用的煤矸石燃烧后灰分较高，粉煤灰的产出量是燃煤电厂的2倍左右，产出的粉煤灰含碳量高，理化特性与燃煤电厂粉煤灰差别较大，且造成了严重的环境污染和土地资源浪费。矸石电厂粉煤灰的循环利用已逐渐引起了学术界的关注，成为了研究热点。陈杰编著的《矸石电厂粉煤灰的活化及应用》一书通过对矸石电厂粉煤灰的形貌特征、化学成分、矿物组成等进行分析，采用化学、物理和物理化学活化技术对粉煤灰-水泥胶砂体系进行激活，得出了合理的活化方案；此外，以矸石电厂粉煤灰取代水泥制造粉煤灰基膏体充填材料，实现废物循环利用。笔者通过学习，认为该书具有较强的实用性，对于实现循环经济具有一定的指导意义，现简要总结重点内容。

冯月娥.矸石电厂粉煤灰的活化及应用技术——评《矸石电厂粉煤灰的活化及应用》[J].混凝土与水泥制品,2021(4):103.

掺锂渣再生混凝土细观结构与抗压强度关系研究

陈洁静，秦拥军，卢义

2021年第4期

摘要

引用本文

摘要：基于计算机图像处理技术，从掺锂渣再生混凝土的CT图像中提取出孔隙结构，利用IPP和FractalFox软件对不同再生粗骨料取代率和不同锂渣掺量立方体试件的孔隙率、分形维数、形状因子进行了计算与统计，并对孔隙特征与立方体抗压强度进行了关联性研究。结果表明：掺锂渣再生混凝土的孔隙率与立方体抗压强度满足三次方程关系；一定范围内，孔隙形状因子与抗压强度之间的关联性良好。 Abstract: Based on the computer image processing technology, the pore structure from CT images of recycled concrete with lithium slag was extracted. The porosity, fractal dimension and shape factor of cube specimens with different recycled coarse aggregate replacement rate and different lithium slag content were calculated and counted by IPP and FractalFox software, and the relationship between the three factors and cube compressive strength was studied. The results show that the porosity and compressive strength of recycled concrete with lithium slag satisfy the cubic equation relationship. There is a good correlation between the pore shape factor and compressive strength within a certain range.

陈洁静,秦拥军,卢义.掺锂渣再生混凝土细观结构与抗压强度关系研究[J].混凝土与水泥制品,2021(4):88-93. CHEN J J,QIN Y J,LU Y.Study on the Relationship Between Microstructure and Compressive Strength of Recycled Concrete with Lithium Slag[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):88-93.

掺粉煤灰再生混凝土声发射检测试验研究

张仕桦1,2，刘京红1，刘婷3，周双双4，刘子倩5

2021年第4期

摘要

引用本文

摘要：为了研究再生混凝土内部损伤随应力变化的演变规律，基于声发射技术对龄期为14 d、28 d、60 d的不同再生粗骨料替代率和不同粉煤灰掺量的混凝土进行了动态检测，获得了表征掺粉煤灰再生混凝土损伤演化过程的典型能量-应力图、撞击累计数-应力曲线以及声发射损伤定位图，探究了再生粗骨料替代率、粉煤灰掺量和龄期对声发射参数的影响，揭示了各应力阶段与内部损伤情况的关系。结果表明：再生粗骨料替代率越高，压密阶段占整个应力上升阶段的时间越长，由1/5上升到1/2，且各阶段的划分不突出，应力破坏阶段相应提前；掺加适量的粉煤灰可以密实再生混凝土内部的初始缺陷，但是，当粉煤灰掺量为30%时，试块在塑性阶段的撞击累计数开始出现剧增现象，使得捕捉材料破坏的预兆信息提前；不同龄期对再生混凝土的内部初始缺陷有一定影响，尤其体现在压密阶段和破坏阶段的撞击累计数上。 Abstract: In order to study the evolvement rule of the internal damage of recycled concrete with the change of stress caused by the initial defect, based on acoustic emission technology, dynamic monitoring was conducted for concrete with different recycled coarse aggregate replacement rate and different fly ash content with ages of 14 d, 28 d and 60 d. The typical energy-strain impact cumulative stress curve and acoustic emission damage location diagram representing the damage evolution process of recycled concrete with fly ash were obtained. The influence of recycled coarse aggregate replacement rate, fly ash content and age on acoustic emission parameters was explored, and the relationship between each stress stage and internal damage was revealed. The results show that the higher the recycled coarse aggregate replacement rate, the longer the compaction stage takes up in the whole stress rising stage, from 1/5 to 1/2, and the division of each stage is not convex, and the stress failure stage is corresponding to the premise. Adding appropriate amount of fly ash can compact the internal defects of recycled concrete. However, when the fly ash content is 30%, the cumulative number of impacts of test block in the plastic phase begins to increase dramatically, which leads to the advance of capturing the foreshadowing information of material failure. Different ages have a certain influence on the internal initial defects of recycled concrete, especially in the cumulative impact of compaction stage and failure stage.

张仕桦,刘京红,刘婷,等.掺粉煤灰再生混凝土声发射检测试验研究[J].混凝土与水泥制品,2021(4):94-98. ZHANG S H,LIU J H,LIU T,et al.Acoustic Emission Detection Experimental Study on Recycled Concrete with Fly Ash[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):94-98.

GRC再生混凝土装饰挂板的研制

肖建庄1，侯逸青1，张宝贵2，李云利2

2021年第4期

摘要

引用本文

摘要：利用再生骨料制备再生混凝土作为玻璃纤维增强水泥（GRC）挂板的装饰层，分别从挂板的组成、物理性能和力学性能方面进行了试验和分析。结果表明：与传统挂板相比，GRC再生混凝土装饰挂板更加轻薄，具有优良的物理性能和力学性能。 Abstract: The decorative layer of the glass fiber reinforced cement (GRC) panel was made of recycled aggregate concrete, and the composition, physical and mechanical properties of the panel were tested and analyzed. The results show that compared with the traditional panel, GRC recycled concrete decorative panel is lighter and thinner, and has excellent physical and mechanical properties.

肖建庄,侯逸青,张宝贵,等.GRC再生混凝土装饰挂板的研制[J].混凝土与水泥制品,2021(4):99-102. XIAO J Z,HOU Y Q,ZHANG B G,et al.Development of GRC Recycled Concrete Decorative Panels[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):99-102.

不同裂缝尺度下无机轻骨料砂浆外墙外保温系统温度场分析

田静静1，袁克龙1，熊厚仁2，郑豪2

2021年第4期

摘要

引用本文

摘要：研究了不同裂缝尺度下无机轻骨料砂浆外墙外保温系统的温度场变化情况，对含预制裂缝宽度为0.05 mm、0.10 mm、0.20 mm、0.30 mm、0.40 mm和0.50 mm的试件进行了160次热雨循环试验，测量了不同裂缝尺度下试件的温度值，分析了各阶段的温度场变化规律。结果表明：与无裂缝情况下相比，试件预制裂缝对基墙温度的变化有一定影响；系统的热物理性能随热雨循环次数的增加而逐渐劣化，裂缝宽度对保温层温度的变化影响很小，仅会对基墙的温度造成一定影响；当裂缝较宽时，基墙将在升温阶段达到较高的温度。 Abstract: The temperature change in the external thermal insulation composite systems of inorganic lightweight aggregate mortar (ETICS-ILAM) containing different crack scales was studied. 160 times of hot rain cycles were carried out on ETICS-ILAM specimens with prefabricated crack widths of 0.05 mm, 0.10 mm, 0.20 mm, 0.30 mm, 0.40 mm and 0.50 mm. The temperature values of the specimens with different crack sizes were measured, and the variation law of the temperature field in each stage was analyzed. The results show that the prefabricated cracks in the specimens have a certain influence on the temperature change in the base-wall. The thermal physical properties of the system gradually deteriorate with the increase of the number of heat-rain cycles. The crack width has little influence on the temperature change in the insulation layer, but has noticeable influence on the temperature in the base-wall. When the crack has a relatively bigger width, the temperature in the base-wall can reach a relatively higher value during the temperature increasing stage.

田静静,袁克龙,熊厚仁,等.不同裂缝尺度下无机轻骨料砂浆外墙外保温系统温度场分析[J].混凝土与水泥制品,2021(4):69-73. TIAN J J,YUAN K L,XIONG H R,et al.Analysis on Temperature Field of External Thermal Insulation Composite Systems of Inorganic Lightweight Aggregate Mortar with Different Crack Scales[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):69-73.

自密实陶粒泡沫混凝土墙板生产试验研究

张珍杰1，王东明1，王可2，邹定华1

2021年第4期

摘要

引用本文

摘要：为了获得合适的陶粒泡沫混凝土墙板生产工艺参数，进行了自密实陶粒泡沫混凝土墙板工厂生产试验。结果表明：混凝土的坍落扩展度是生产中的关键参数，当其达到SF1级自密实混凝土性能要求时，所生产墙板的完整性好，但是表面缺陷较多；而达到SF2级自密实混凝土性能要求时，所生产墙板的质量好，表面缺陷少；混凝土的工作性越好，累计破泡率越小。 Abstract: In order to obtain appropriate production technology parameters of ceramist foam concrete wall panels, the factory production tests of self-compacting ceramsite foam concrete wall panels in production were carried out. The results show that the slump flow of concrete is the key parameter in production, and when it meets the requirement of class SF1 self-compacting concrete, the integrity of wall panels is good, but there are many surface defects. When it meets the requirement of class SF2 self-compacting concrete, the quality of wall panels is good and the surface defects are less. The better the workability of concrete, the smaller the cumulative bubble breaking rate.

张珍杰,王东明,王可,等.自密实陶粒泡沫混凝土墙板生产试验研究[J].混凝土与水泥制品,2021(4):74-77. ZHANG Z J,WANG D M,WANG K,et al.Research on Production Test of Self-compacting Ceramist Foam Concrete Wall Panels[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):74-77.

CFRP板加固高强混凝土梁试验研究

韩艳，王龙龙

2021年第4期

摘要

引用本文

摘要：通过三点弯曲试验，并利用CCD相机及数字散斑分析技术研究了CFRP板裂缝扩展至破坏的全过程。结果表明：各因素对试件承载力的影响程度从大到小依次为CFRP板厚、加载速率、裂缝深度、混凝土强度；粘贴CFRP板的高强混凝土试件破坏是由混凝土剪切破坏引起的CFRP板粘贴胶层与混凝土之间的界面剥离破坏，其从裂缝开始扩展到完全破坏的时间明显长于未粘贴CFRP板的试件；黏结界面仍是外粘CFRP板加固高强混凝土构件的薄弱部位。 Abstract: The whole process of the specimens from crack propagation to destruction was studied through the three-point bending test, and the CCD camera observation system and digital speckle analysis technology were used. The test results show that the order of influence factors on the bearing capacity of the high-strength concrete specimens is CFRP plate thickness, loading rate, depth of the pre-crack and the concrete strength. The failure of high-strength concrete specimens reinforced with external CFRP plates is the interface peeling damage between the CFRP plates adhesive layer and the concrete caused by the shear failure of the concrete, and the time from crack propagation to complete failure is significantly longer than that of the specimens without CFRP reinforcement. The bonding interface is still the weak part of the high-strength concrete members reinforced by externally bonding CFRP plates.

韩艳,王龙龙.CFRP板加固高强混凝土梁试验研究[J].混凝土与水泥制品,2021(4):78-82. HAN Y,WANG L L.Experimental Study on Strengthening High-strength Concrete Beam with CFRP Plates[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):78-82.

国外蒸压加气混凝土板式承重墙研究现状

李欣忆1，王昊2，任宝双2，初明进1，陈国尧1，李祥宾1

2021年第4期

摘要

引用本文

摘要：与蒸压加气混凝土砌块墙相比，蒸压加气混凝土配筋墙板对低层建筑可不设置构造柱，混凝土现场浇筑量小、构件尺寸大的特点使其组装更高效。本文介绍了蒸压加气混凝土板式承重墙结构在国外的应用情况，结合已有研究成果和相关技术规范对该结构的力学性能进行了说明，并展望了该结构体系的应用前景。研究表明：蒸压加气混凝土板式承重墙的抗震性能良好，结构在设防烈度下可以保持预屈服状态，在大震作用下具有充分的强度储备。 Abstract: Compared with autoclaved aerated concrete block wall, autoclaved aerated concrete panel wall of low-rise buildings has no need to composite with constructional column. Small quantity of concrete pouring and large component size make its assembly more efficient. The application of autoclaved aerated concrete load bearing panel wall structure abroad is introduced, and the mechanical properties of the structure according to the research results and relevant design codes are reviewed. Researches indicate that autoclaved aerated concrete load bearing panel wall has good seismic performance. The wall behaves in its pre-yield region under the seismic fortification intensity, and has sufficient strength reservation in strong earthquake. In conclusion, the application of autoclaved aerated concrete load bearing panel wall structure is prospected.

李欣忆,王昊,任宝双,等.国外蒸压加气混凝土板式承重墙研究现状[J].混凝土与水泥制品,2021(4):83-87. LI X Y,WANG H,REN B S,et al.Research Status in Autoclaved Aerated Concrete Load Bearing Panel Walls Abroad[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):83-87.

高温后PVA纤维增强水泥基复合材料力学性能试验研究

杨珊1，李祚1，彭林欣1,2，罗月静3,4，滕晓丹1,2,5

2021年第4期

摘要

引用本文

摘要：对经过100 ℃、200 ℃、400 ℃、600 ℃高温处理后的聚乙烯醇纤维增强水泥基复合材料（PVA-ECC）进行了单轴压缩试验、单轴拉伸试验、剪切试验和四点弯曲试验，对不同温度下的试验结果进行了对比分析，拟合了高温后PVA-ECC各项性能的退化曲线，并通过扫描电镜观察了微观结构。结果表明：PVA-ECC在常温下能够表现出良好的变形能力；当温度由常温升至100 ℃时，抗压强度大幅下降，继续升至200 ℃时则有一定提高；当温度超过200 ℃以后，抗压强度、抗拉强度和极限拉应变均降低，试件由延性破坏变为脆性破坏；常温下，PVA-ECC试件表面密实完整，经过400 ℃高温处理后，试件呈现出稀疏多孔结构，温度超过600 ℃时，试件表面呈片状、海绵状形态。 Abstract： Uniaxial compression, uniaxial tensile, shearing and four-point bending tests were carried out on polyvinyl alcohol fiber reinforced cement-based composite materials (PVA-ECC) after high temperature treatment at 100 ℃, 200 ℃, 400 ℃ and 600 ℃. The test results at different temperatures were compared and analyzed, the degradation curves of various properties of PVA-ECC after high temperature were deduced, and the microstructure was observed by scanning electron microscope. The results show that PVA-ECC has good deformation capacity at room temperature. When the temperature rises from room temperature to 100 ℃, the compressive strength decreases greatly, and then increases to a certain extent when it continues to rise to 200 ℃. When the temperature exceeds 200 ℃, the compressive strength, tensile strength and ultimate tensile strain of PVA-ECC are reduced, and the specimen changes from ductile failure to brittle failure. At room temperature, the surface of PVA-ECC is dense and complete. After being treated at 400 ℃, the specimen exhibits a sparse porous structure. When the temperature exceeds 600 °C, the surface of the specimen becomes flake and sponge.

杨珊,李祚,彭林欣,等.高温后PVA纤维增强水泥基复合材料力学性能试验研究[J].混凝土与水泥制品,2021(4):49-54. YANG S,LI Z,PENG L X,et al.Study on Mechanical Properties of PVA-ECC Composites After Elevated Temperature[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):49-54.

混杂纤维轻骨料混凝土力学与导热性能研究

黄晓雯，庞建勇，王凤瑶，沈恒祥，刘宜思

2021年第4期

摘要

引用本文

摘要：采用正交试验对钢-植物混杂纤维轻骨料混凝土（Steel-plant Fibre Hybrid Lightweight Aggregate Concrete，SPFLC）的抗压强度、抗拉强度、抗剪强度和导热性能进行了研究，并使用Matlab软件进行了多元线性回归分析，得到了SPFLC力学性能与导热性能的预测模型。结果表明：陶粒掺量对SPFLC的抗压强度、抗拉强度、抗剪强度和导热性能均有高度显著影响，对抗拉强度的贡献率最大为67.48%；陶砂掺量对SPFLC的抗拉强度几乎无影响，对抗压强度的贡献率最大为49.72%；钢纤维掺量对SPFLC的抗压强度和抗剪强度有高度显著影响，对抗剪强度的贡献率最大为42.36%；植物纤维掺量对SPFLC的力学性能和导热性能均有高度显著影响，对抗拉强度的贡献率最大为26.61%，且随着植物纤维掺量的增加，导热系数最大下降了23.7%；建立的SPFLC力学性能与导热性能预测模型的精度较高。 Abstract: The compressive strength, tensile strength, shear strength and thermal conductivity of steel-plant hybrid fiber lightweight aggregate concrete(SPFLC) were studied by orthogonal tests. The prediction model of mechanical properties and thermal conductivity of SPFLC were obtained by multiple linear regression analysis with Matlab software. The results show that the ceramsite content has a highly significant influence on the compressive strength, tensile strength, shear strength and thermal conductivity of SPFLC, and the maximum contribution rate to tensile strength is 67.48%. The content of ceramic sand has almost no influence on the tensile strength of SPFLC, and the maximum contribution rate to compressive strength is 49.72%. The steel fiber content has a highly significant influence on the compressive strength and shear strength of SPFLC, and the maximum contribution rate to shear strength is 42.36%. The plant fiber content has a highly significant influence on the mechanical and thermal properties of SPFLC, among which the contribution rate to tensile strength is up to 26.61%, and the thermal conductivity decreases by 23.7% with the increase of plant fiber content. The prediction models of mechanical properties and thermal conductivity of SPFLC have a high accuracy.

黄晓雯,庞建勇,王凤瑶,等.混杂纤维轻骨料混凝土力学与导热性能研究[J].混凝土与水泥制品,2021(4):55-59. HUANG X W,PANG J Y,WANG F Y,et al.Study on Mechanical and Thermal Conductivity of Hybrid Fiber Lightweight Aggregate Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):55-59.

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