The aim of this work is to develop new-generation ultra-high-performance fiber self-compacting concretes (SCCs) by introducing pyrophyllite rock powder as a cement substitute and assess its effects on the fresh and hardened properties. Three series of concretes were developed. The first series of reference fiber SCCs without pyrophyllite contained 1% adherent steel fibers or 1% slippery polymeric polypropylene fibers or a mixture of 0.5% steel and 0.5% polypropylene fibers. The second and the third series contained fibers and 10 or 20% pyrophyllite. The results showed that incorporation of pyrophyllite generates good fluidity, satisfactory stability without any risk of segregation and an ability to flow in a confined environment without risk of blocking of the fiber SCC. Moreover, the ultrasonic velocity, elastic dynamic modulus and rebound hammer number increase with increasing pyrophyllite rate. Also, a gain in compressive and flexural strengths was obtained at 28 days and the fiber SCCs were judged to be of good quality. The best formulation is the one containing steel fibers and 10% pyrophyllite. This additive has shown its potential to be used as a substitute for cement and its beneficial effect in protecting the environment.

中文翻译：

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基于叶蜡石的新一代纤维自密实混凝土

这项工作的目的是通过引入叶蜡石岩粉作为水泥替代品来开发新一代超高性能纤维自密实混凝土（SCC），并评估其对新鲜和硬化性能的影响。开发了三个系列的混凝土。没有叶蜡石的第一系列参考纤维SCC包含1％的粘附钢纤维或1％的光滑聚合聚丙烯纤维或0.5％的钢和0.5％的聚丙烯纤维的混合物。第二和第三系列包含纤维和10％或20％的叶蜡石。结果表明，叶蜡石的掺入产生良好的流动性，令人满意的稳定性而没有任何分离的风险，并且能够在密闭的环境中流动而没有阻塞纤维SCC的风险。而且，超声波速度 随着叶蜡石速率的增加，弹性动态模量和回弹锤数增加。另外，在28天时获得了抗压强度和抗弯强度的增加，并且认为纤维SCC具有良好的品质。最好的配方是含有钢纤维和10％叶蜡石的配方。该添加剂已显示出其潜力，可以用作水泥的替代品，并且在保护环境方面具有有益的作用。