使用石灰石水泥之混凝土和砂漿之性質研究

Abstract

近年來，地球暖化和氣候變遷帶來了嚴重威脅，迫切需要採取節能減碳措施來保護地球。國際社會對減少碳排放做出了努力，特別是水泥產業，作為全球碳排放的主要來源之一，正積極尋找解決方案。為此，需要研究和改進水泥生產過程，尋找更環保的生產方法，開發新型材料，並採用節能技術以減少碳排放。 本研究旨在使用石灰石水泥來減少碳排放，生產石灰石混合水泥來取代卜特蘭水泥，這是目前國際上一個有效的減碳方法。本研究考慮了不同配比對材料性能的影響，研究不同石灰石水泥規格、礦物摻料及粒料的影響，並進行新拌性質、力學性質、耐久性及絕熱溫升等試驗。通過深入研究混凝土和水泥砂漿，可以全面了解不同因素對材料性能的影響，並為配比設計提供更科學的基礎，從而提高混凝土的性能表現，增強混凝土結構的品質和耐久性。 根據實驗結果，不同石灰石水泥規格、礦物摻料及粒料的配比透過添加適量的藥劑，可以成功控制混凝土的工作性，確保其性能達到標準要求。石灰石混合水泥與卜特蘭I型水泥在新拌性質方面表現相似。在力學性能方面，在添加不同礦物摻料和使用不同粒料的情況下，石灰石水泥在早期硬固階段表現出較高的抗壓強度，但隨著齡期的增加，抗壓強度開始下降，最終強度與I型水泥無明顯差異。石灰石水泥在抗氯離子能力方面稍具優勢，但在抗硫酸鹽侵蝕方面需要透過增加礦物摻料來提升其耐久性。

In recent years, global warming and climate change have posed significant threats, necessitating urgent energy-saving and carbon-reduction measures to protect our planet. The international community has made efforts to reduce carbon emissions, particularly in the cement industry, which is one of the major sources of global carbon emissions. This has led to research and improvements in the cement production process, the search for more environmentally friendly production methods, the development of new materials, and the adoption of energy-saving technologies to reduce carbon emissions. This study aims to reduce carbon emissions by using limestone cement, producing limestone blended cement to replace Portland cement, which is currently an effective carbon reduction method internationally. The study considers the effects of different mix proportions on material performance, investigating the impact of different limestone cement specifications, mineral admixtures, and aggregates. Tests on fresh properties, mechanical properties, durability, and adiabatic temperature rise were conducted. Through in-depth research on concrete and cement mortar, a comprehensive understanding of the effects of different factors on material performance can be achieved, providing a more scientific basis for mix design, thereby improving concrete performance and enhancing the quality and durability of concrete structures. According to the experimental results, the workability of concrete can be successfully controlled by adding appropriate additives to different proportions of limestone cement specifications, mineral admixtures, and aggregates, ensuring that the performance meets the standard requirements. Limestone blended cement and Portland Type I cement exhibited similar fresh properties. In terms of mechanical properties, when different mineral admixtures and aggregates are used, limestone cement demonstrated higher compressive strength during the early hardening stage. However, as the age increased, the compressive strength began to decline, and the final strength showed no significant difference compared to Type I cement. Limestone cement showed a slight advantage in chloride ion resistance but required the addition of mineral admixtures to enhance its durability against sulfate attack.