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发布时间:2020-01-06 00:00:00
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纤维水泥制品

玄武岩纤维和外加剂对混凝土力学和抗裂性能的影响
玄武岩纤维和外加剂对混凝土力学和抗裂性能的影响
  • 夏艳晴1,2,种 娜1,林 燕1,钟 文1,王 宁1,2
2023年第2期
摘要
引用本文
摘   要:研究了玄武岩纤维(BF)、可再分散乳胶粉、羟乙基甲基纤维素醚(HEMC)、UEA膨胀剂和十二烷基硫酸钠(K12)对混凝土力学性能和抗裂性能的影响。结果表明:随着可再分散乳胶粉掺量的增加,混凝土的抗压强度和劈裂抗拉强度基本呈降低趋势,拉压比先减小后增大;随着BF掺量的增加,混凝土的抗压强度和劈裂抗拉强度先增大后减小,拉压比基本呈增大趋势,抗裂性能提升;复掺BF、可再分散乳胶粉、HEMC、UEA膨胀剂和K12 时,混凝土的抗压强度和劈裂抗拉强度较复掺BF、可再分散乳胶粉、HEMC和UEA膨胀剂时有所降低,但拉压比增大,抗裂性能显著提升。 Abstract: The effects of basalt fiber(BF), redispersible latex powder, hydroxyethyl methyl cellulose ether (HEMC), UEA expansion agent and sodium dodecyl sulfate (K12) on the mechanical properties and crack resistance of concrete were studied. The results show that the compressive strength and splitting tensile strength of concrete basically decrease with the increase of redispersible latex powder content, and the tensile compression ratio decreases first and then increases. With the increase of BF content, the compressive strength and splitting tensile strength of concrete first increase and then decrease, the tension compression ratio basically increases, and the crack resistance is improved. When mixed with BF, redispersible latex powder, HEMC, UEA expansion agent and K12, the compressive strength and splitting tensile strength of concrete are lower than those of mixed with BF, redispersible latex powder, HEMC and UEA expansion agent, but the tensile compression ratio is increased, and the crack resistance is significantly improved.
夏艳晴,种娜,林燕,等.玄武岩纤维和外加剂对混凝土力学和抗裂性能的影响[J].混凝土与水泥制品,2023(2):51-54,59. XIA Y Q,CHONG N,LIN Y,et al.Effect of Basalt Fiber and Admixture on Mechanical Properties and Crack Resistance of Concrete[J].China Concrete and Cement Products,2023(2):51-54,59.
不同PVA纤维增强水泥基复合材料性能试验研究
不同PVA纤维增强水泥基复合材料性能试验研究
  • 刘军宏1,郑银林2,3,马锋玲2,刘艳霞2,王利娜2
2023年第2期
摘要
引用本文
摘   要:对比研究了日本PVA纤维(J-PVA纤维)和国产PVA纤维(C-PVA、S-PVA纤维)对工程水泥基复合材料(ECC)性能影响的差异。结果表明:在纤维体积掺量为2.0%的条件下,掺J-PVA纤维的ECC能够完全实现多点开裂,应变硬化特征显著,28 d极限拉应变在3.7%以上;掺C-PVA纤维ECC的28 d极限拉应变在2.1%以上,增韧效果良好,且具有明显的价格优势,在实际工程应用中具有较强的竞争力;S-PVA纤维对ECC性能的改善效果不如J-PVA纤维和C-PVA纤维,工程应用中应注意优选甄别。     Abstract: The effects of Japanese PVA fiber(J-PVA fiber) and domestic PVA fiber(C-PVA、S-PVA fiber) on engineering cementitious composites(ECC) properties were compared. The results show that when the fiber volume fraction is 2.0%, the ECC mixed with J-PVA fiber can fully realize multi-point cracking, and the strain hardening characteristics are significant, and the 28 d ultimate tensile strain is above 3.7%. The 28 d ultimate tensile strain of ECC mixed with C-PVA fiber is more than 2.1%, which shows that the toughening effect is good, and it has obvious price advantage, and has strong competitiveness in practical engineering applications. The improvement effect of S-PVA fiber on ECC performance is not as good as that of J-PVA fiber and C-PVA fiber, and the attention should be paid to the selection and discrimination in engineering application.
刘军宏,郑银林,马锋玲,等.不同PVA纤维增强水泥基复合材料性能试验研究[J].混凝土与水泥制品,2023(2):55-59. LIU J H,ZHENG Y L,MA F L,et al.Experimental Study on Properties of Different PVA Fiber Reinforced Cementitious Composites[J].China Concrete and Cement Products,2023(2):55-59.
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