纤维水泥及制品_2020_《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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纤维水泥及制品

合成纤维混凝土弯曲韧性研究

王金辉1，葛晨2，谈永泉3，俞君宝2

2020年第11期

摘要

引用本文

摘要：通过聚丙烯腈（PAN）纤维混凝土和聚乙烯醇（PVA）纤维混凝土的三点弯曲切口梁试验，研究了合成纤维掺量和弹性模量对混凝土弯曲韧性的影响，探究了纤维混凝土跨中挠度（δ）和裂缝张开口位移（CMOD）与纤维掺量的关系。结果表明：针对混凝土弯曲韧性而言，PAN纤维与PVA纤维的合适掺量范围分别为1.5~1.8 kg/m3和1.3~1.5 kg/m3；δ与CMOD之间存在线性关系，可以用纤维掺量与CMOD预测δ。 Abstract: The influence of the content and elastic modulus of synthetic fiber on the flexural toughness of polyacrylonitrile (PAN) fiber concrete and polyvinyl alcohol (PVA) fiber concrete was studied by the three-point bending notch beam test. The relationship between midspan deflection (δ) and crack tensioning displacement (CMOD) and fiber content of fiber concrete was investigated. The results show that the optimal content range of PAN fiber and PVA fiber are 1.5~1.8 kg/m3 and 1.3~1.5 kg/m3, respectively. There is a linear relationship between δ and CMOD, the fiber content and CMOD can be used to predict δ.

王金辉,葛晨,谈永泉,等.合成纤维混凝土弯曲韧性研究[J].混凝土与水泥制品,2020(11):61-65. WANG J H,GE C,TAN Y Q,et al.Study on Flexural Toughness of Synthetic Fiber Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(11):61-65.

混杂纤维混凝土抗Cl-渗透性能试验研究

张克纯1,2，余江滔3，刘柯柯3

2020年第11期

摘要

引用本文

摘要：采用改进的干湿循环浸泡法，对比研究了PE纤维混凝土、钢纤维混凝土和混杂纤维（PE纤维+钢纤维）混凝土的抗Cl-渗透性能。结果表明，纤维混凝土的抗Cl-渗透性与纤维总表面积之间存在线性相关性，纤维总表面积越大，混凝土抗Cl-渗透性能越差；PE纤维和混杂纤维混凝土的抗Cl-渗透性能低于普通混凝土，钢纤维混凝土的抗Cl-渗透性能高于普通混凝土；在混杂纤维总体积掺量不变的情况下，PE纤维的掺量越多，混杂纤维混凝土的Cl-渗透系数越大，抗Cl-渗透能力越差。 Abstract: The resistance of PE fiber concrete, steel fiber concrete and hybrid fiber(PE fiber + steel fiber) concrete to chloride ion penetration was studied by the improved dry-wet cyclic immersion test. The results show that there is a linear correlation between the resistance to chloride ion penetration of fiber concrete and the total surface area of fiber in concrete. The resistance to chloride ion penetration of PE fiber concrete and hybrid fiber concrete is lower than that of ordinary concrete, while the resistance to chloride ion penetration of steel fiber concrete is slightly higher than that of ordinary concrete. Under the condition that the total volume of hybrid fiber remains unchanged, the more the content of PE fiber, the greater the permeability coefficient of chloride ion and the worse the permeability of chloride ion.

张克纯,余江滔,刘柯柯.混杂纤维混凝土抗Cl-渗透性能试验研究[J].混凝土与水泥制品,2020(11):57-60,65. ZHANG K C,YU J T,LIU K K.Experimental Study on Resistance to Chloride Ion Penetration of Hybrid Fiber Reinforced Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(11): 57-60,65.

混杂纤维自密实混凝土冻融性能试验研究

吕圆芳，杨永东

2020年第十一期

摘要

引用本文

摘要：研究了PP纤维、镀铜钢纤维和钢-PP混杂纤维对自密实混凝土工作性及冻融前后力学性能的影响，并探讨了冻融作用对纤维混杂增强效应系数的影响。结果表明：PP纤维对自密实混凝土工作性的影响大于钢纤维；未掺纤维的空白组经300次冻融后，其质量损失率及相对动弹性模量损失分别达到4.23%、34.8%，表观质量劣化严重；冻融作用对试件抗折强度影响最大，其次是动弹性模量和抗压强度；纤维的掺入能有效提高混凝土的抗冻性能，但钢纤维对表观质量的改善作用小于PP纤维；混杂纤维抗冻融能力明显高于单掺纤维组和空白组，纤维混杂增强效应随冻融循环次数的增加而降低。 Abstract: The effects of polypropylene fiber(PP), ultrafine steel fiber and steel-PP hybrid fiber on the workability and mechanical properties of self compacting concrete(SCC) before and after freeze-thaw were studied, and the influence of freeze-thaw on fiber hybrid reinforcement effect coefficient was discussed. The results show that PP fiber has greater influence on the workability of SCC than steel fiber. After 300 freeze-thaw cycles, the mass loss rate and relative dynamic elastic modulus loss of the SCC without fiber reach 4.23% and 34.8%, respectively, and the apparent quality deteriorate seriously. The freeze-thaw effect has the greatest influence on the flexural strength of the specimen, followed by the dynamic elastic modulus and compressive strength. The addition of fiber can effectively improve the frost resistance of SCC, but the improvement effect of steel fiber on the apparent quality is less than that of PP fiber. The freeze-thaw resistance of the hybrid fiber specimens is significantly higher than that of the single-blend fiber group and the blank group, and the fiber hybrid reinforcement effect coefficient decreases with the increase of freeze-thaw cycles.

吕圆芳,杨永东.混杂纤维自密实混凝土冻融性能试验研究[J].混凝土与水泥制品,2020(11):52-56. LYU Y F,YANG Y D.Experimental Study on Freeze-thaw Performance of Hybrid Fiber Reinforced Self-compacting Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(11):52-56.

关于我国纤维水泥制品发展现状与技术创新的思考

冯立平1，章建阳2

2020年第11期

摘要

引用本文

摘要：阐述了现阶段我国纤维水泥制品的种类、生产企业分布、技术装备和应用情况，分析了我国纤维水泥制品行业目前存在的主要问题，如智能化水平不高、工业化和信息化融合程度较低、产品多样性不足、安全生产及绿色环保理念落后、科研投入不足、产业链不健全等，并结合我国的政策要求和技术水平对纤维水泥制品行业的可持续发展进行了展望。 Abstract: The product types, production enterprise distribution, technical equipment and applications of Chinese fiber cement products industry at this stage are explained, and the main problems existing in Chinese fiber cement products industry are analyzed, such as low level of intelligence, low degree of integration of industrialization and informatization, lack of product diversity, backward concept of safety production and green environmental protection, insufficient investment in scientific research, and imperfect industrial chain, etc. Combined with Chinese policy requirements and technical level, the sustainable development of the fiber cement products industry is prospected.

冯立平,章建阳.关于我国纤维水泥制品发展现状与技术创新的思考[J].混凝土与水泥制品,2020(11):48-51. FENG L P,ZHANG J Y.Thoughts on the Development Status and Technological Innovation of Fiber Cement Products in China[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(11):48-51.

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