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    何   蕾

          （首都醫(yī)科大學(xué)附屬北京友誼醫(yī)院 ，北京 100050)

摘   要 ：為提高高層建筑筏板基礎(chǔ)粉煤灰混凝土的性能 ，設(shè)計(jì)了四種粉煤灰摻量的混凝土試件 ，對(duì)其抗壓 強(qiáng)度 、抗氯離子滲透 、抗碳化以及循環(huán)試驗(yàn)（凍融循環(huán)和干濕循環(huán)） 下的損傷特性進(jìn)行分析。結(jié)果表明： 粉煤 灰摻量為 30% 的混凝土試件在 56 d 齡期時(shí)抗壓強(qiáng)度達(dá)到最高 ，為 78 . 5  MPa;  在 60 d 浸泡時(shí)間下的電通量增長幅 度最小 ，從 642 C 增加至 964 C ,  表現(xiàn)出最佳的抗氯離子滲透能力 ；同時(shí) ，在 60 d 碳化周期下的碳化深度保持最 低 ，為 9. 7 mm ,  展現(xiàn)出優(yōu)異的抗碳化性能。因此 ，粉煤灰摻量為 30% 的混凝土試件在抗壓強(qiáng)度 、抗氯離子滲透 和抗碳化方面均表現(xiàn)出顯著優(yōu)勢(shì) ，可以為類似工程提供參考。

關(guān)鍵詞：高層建筑 ；筏板基礎(chǔ) ；粉煤灰 ；混凝土 ；損傷特性 ；抗碳化 ；循環(huán)試驗(yàn) ；電通量

中圖分類號(hào)：TU528           文獻(xiàn)標(biāo)志碼：A            

文章編號(hào)： 1005- 8249   (2025)  03- 0058- 06 

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .03 .011

HE Lei

（Beijing Friendship Hospital，Capital Medical University, Beijing 100050,China）

Abstract: To gain a deeper understanding of the hydrothermal characteristics of low heat Portland cement, the thermodynamic properties and crack resistance of low heat Portland cement were analyzed based on the fly ash content and curing conditions. Prepare concrete test blocks using low heat Portland cement as the base material. Detect the heat release rate, total heat release, and adiabatic temperature rise of the test blocks, and analyze the effects of different curing environments and water cement ratios on the cracking performance of each test block. The results showed that compared with the test blocks prepared with ordinary cement, the test blocks prepared with fly ash combined with low heat Portland cement exhibited significant thermodynamic properties, lower heating rate and first rising and then falling, slower hydration reaction, lower heat release, much lower adiabatic temperature rise than ordinary cement, and better thermodynamic properties. Low-heat Portland cement specimens cured in a constant temperature and humidity environment are less prone to cracking, and specimens with a water cement ratio of 0.6 are also less prone to cracking. Therefore, fly ash composite low heat Portland cement can significantly improve hydration heat performance and suppress cracking under optimized curing conditions and water cement ratio, making it suitable for engineering fields with strict temperature control such as large volume concrete.

Key words: low-heat portland cement; thermodynamics; crack resistance; water-binder ratio

作者簡介： 何    蕾  (1985—) ,   女 ，本科 ，工程師 ，研究方

向 ：建筑相關(guān)。

收稿日期：2024 - 12 - 31