本研究探討ASAHI Carbon Co., LTD.所生產的商品級碳黑顆粒(ASAHI-020)在波特蘭I型和II型硬化水泥漿體中的力學、熱學和電學性質，由於碳黑具有良好的導熱與導電性質，因此碳黑顆粒對於增加水泥整體導熱和導電性具有較佳的潛在效益。在整個研究過程中，水灰比設定為0.5，碳黑替代水泥的百分比選擇為0%、5%、7.5%和10% (水灰 比=0.5、0.526、0.54和0.556)。利用鐘擺式黏彈性頻譜儀和共振超聲波頻譜儀，通過實驗確定了相應變形模式的楊氏模量、剪切模量和損耗角正切。還研究了硬化漿體的抗壓強度。我們發現I 型和II 型波特蘭水泥對碳黑顆粒的反應無法區別。發現由於碳黑顆粒的吸水性，隨著碳黑百分比的增加，抗壓強度降低。對於28天齡期的10%碳黑替代試體，我們發現抗壓強度降低了62%，模量降低了22-47%。損耗角正切降低了10%。在本研究中，由於碳黑顆粒水泥的可加工性問題，顆粒濃度越高的樣品，水灰比越大。因此，試體力學性能的降低是由於兩個相互競爭的機制。一是水灰比高，二是碳黑顆粒的存在。需要進一步的研究來定量地闡明這些機制的影響。至於電導率和熱導率，它們隨著碳黑含量的增加而增加。對於10%的碳黑取代，我們發現導熱係數提高了78%，導電率提高了66-85%。為了保持或改善碳黑矽酸鹽水泥的機械性能，我們建議使用超細研磨碳黑顆粒來減小其孔徑，從而限制其吸水能力。可以預見，在不久的將來，具有高導電性和導熱性的矽酸鹽水泥將廣泛應用於智能混凝土中，用於健康監測和能量收集。

Effects of commercial grade carbon black particles (ASAHI-020), from ASAHI Carbon Co., LTD., in Type-I and Type-II Portland hardened cement paste were studied for their potential benefits in increasing overall thermal and electric conductivity. Throughout the research process, the water-cement ratio was set to 0.5, and the substitution percentage of carbon black to cement was selected as 0%, 5%, 7.5%, and 10% (W/C=0.5, 0.526, 0.54 and 0.556). Using pendulum viscoelastic spectrometer and resonance ultrasonic spectrometer, the Young’s modulus, shear modulus and loss tangent of the corresponding deformation mode were determined through experiments. The compressive strength of the hardened paste was also studied. We found that the reactions of Type I and Type II Portland cement to carbon black particles are indistinguishable. It is found that due to the water absorption of carbon black particles, as the percentage of carbon black increases, the compressive strength decreases. For the 28-day-old 10% carbon black replacement, we found that the compressive strength was reduced by 62%, and the modulus was reduced by 22-47%. The loss tangent is reduced by 10%. In this research, due to workability issue in cement with carbon black particles, larger water/cement ratios were adopted for samples with higher concentration of the particles. Therefore, the reduction of the mechanical properties of the samples are due to two competing mechanisms. One is the high water/cement ratio and the other the presence of carbon black particles. Further research is needed for quantitatively clarify effects of the mechanisms. As for electrical conductivity and thermal conductivity, they increase as the carbon black content increases. For 10% carbon black replacement, we found that the thermal conductivity increased by 78%, and the electrical conductivity increased by 66-85%. In order to maintain or improve the mechanical properties of carbon black Portland cement, we recommend using ultra-fine ground carbon black particles to reduce its pore size, thereby limiting its water absorption capacity. It is foreseeable that in the near future, Portland cement with high electrical and thermal conductivity will be widely used in smart concrete for health monitoring and energy harvesting.

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