Abstract
Ultra High Performance Fiber Reinforced Concrete (UHPFRC) is a cement-based material, which behaves like a low-porosity ceramic material with excellent mechanical performance. This work was aimed to study soft cast (flowable at casting time) UHPFRC s and, in particular, the time development of compressive strength, flexural strength and elastic modulus was monitored for UHPFRC prepared by varying the water to cement ratio from 0.20 to 0.32. Silica fume, steel fibers and acrylic-based superplasticizer were employed to prepare the UHPFRC mixtures. Optimum workability and mechanical performance were obtained with a water to cement ratio of 0.24. Thermal conductivity was determined for the same UHPFRC, in the presence and in the absence of steel fibers. The scope was to eva luate the effect of steel fibers on the thermal conductivity coefficient, in order to predict the UHPFRC capacity for heat loss. This information as well as its drilling characteristics, in order to test its suitability to be machined, could be essential for possible fields of application such as in mechanical engineering, where UHPFRC materials can be employed as high abrasion-resistant dies in the molding process of metal and polymer products.
_ 2011 Elsevier Ltd. All rights reserved.

Keywords Machine workability Mechanical performance UHPFRC
超高性能纖維混凝土(UHPFRC)是一種水泥基材料，它的行為就像一個(gè)低孔隙度的陶瓷材料，具有優(yōu)良的機(jī)械性能。這項(xiàng)工作是為了研究研究UHPFRC軟鑄造年代(澆筑時(shí)刻流動(dòng))，特別是時(shí)代發(fā)展的壓縮強(qiáng)度、抗彎強(qiáng)度和彈性模量進(jìn)行了UHPFRC準(zhǔn)備，通過(guò)改變水灰比在0.20 ~ 0.32之間。硅灰、鋼纖維和acrylic-based增塑劑用來(lái)準(zhǔn)備UHPFRC的混合物。工作性和力•學(xué)性能最佳得到水灰比為0.24。導(dǎo)熱系數(shù)確定了一樣UHPFRC，存在著沒(méi)有鋼纖維。范圍的影響是評(píng)價(jià)鋼纖維導(dǎo)熱系數(shù)上，以預(yù)測(cè)UHPFRC介紹評(píng)價(jià)鋼纖維導(dǎo)熱系數(shù)上,以預(yù)測(cè)能力UHPFRC熱量損失。這它的鉆探信息特征，旨在測(cè)試的適用性加工，有可能必不可少的可能應(yīng)用領(lǐng)域如在機(jī)械工程，在那里UHPFRC材料可采用高耐磨模具成型工藝的金屬和聚合物產(chǎn)品。
2011年教育部博士點(diǎn)基金有限公司版權(quán)所有


關(guān)鍵詞: 機(jī)性能 力學(xué)性能 UHPFRC 硅灰 導(dǎo)熱系數(shù)