| 吴欣珂,金凌志.养护制度对活性粉末混凝土承载力的影响研究[J].井冈山大学自然版,2024,45(1):101-106 |
| 养护制度对活性粉末混凝土承载力的影响研究 |
| EFFECTS OF CONSERVATION SYSTEM ON THE CARRYING CAPACITY OF REACTIVE POWDER CONCRETE |
| 投稿时间：2023-06-05 修订日期：2023-10-19 |
| DOI：10.3969/j.issn.1674-8085.2024.01.001 |
| 中文关键词: 活性粉末混凝土 养护制度 抗压强度 |
| 英文关键词: reactive powder concrete curing system compressive strength |
| 基金项目:国家自然科学基金项目(51368013)；广西岩土力学与工程重点实验室资助课题项目（11-cx-04) |
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| 中文摘要: |
| 为了研究活性粉末混凝土在不同养护制度条件下对承载能力的影响，制作了30个活性粉末混凝土试块和2根HRB500级钢筋活性粉末混凝土简支梁，进行抗压、抗折和抗弯承载力研究试验，分析试块与试验梁的承载力大小随温度的变化情况，利用扫描电镜研究了在不同养护制度下活性粉末混凝土内部结构变化。研究结果表明：（1）当试件养护温度在[常温 ~ 180 ℃]范围内，活性粉末混凝土（RPC）质量损失很小；（2）当温度低于180 ℃时，随着温度升高，水泥水化反应加剧，RPC微观结构得到改善，抗压强度提高；（3）当温度达到设定值后，继续保持设定温度养护较非恒定温养护的抗压强度高；（4）当养护温度达到180 ℃时，RPC基体中仍存在未水化颗粒，由此可以假定养护温度仍可以提高。 |
| 英文摘要: |
| In order to study the influence of reactive powder concrete on the bearing capacity under different curing regimes, 30 reactive powder concrete test blocks and 2 HRB500 grade steel reactive powder concrete simply supported beams were fabricated for compressive, flexural, and bending bearing capacity studies. The variation of the bearing capacity of the test blocks and test beams with temperature was analyzed, and the internal structural changes of reactive powder concrete under different curing regimes were investigated using scanning electron microscopy. Research structure shows that: (1) When the curing temperature of the test specimen is within the range of [normal temperature-180℃], the mass loss of RPC is very small; (2) When the temperature is below 180℃, the hydration reaction of cement intensifies as the temperature rises, the microstructure of RPC improves, and the compressive strength increases; (3) When the temperature reaches the set value, the compressive strength of the concrete cured at the set temperature is slightly higher than that of the concrete cured at non-constant temperature; (4) When the curing temperature reaches 180 ℃, there are still unhydrated particles in the RPC matrix, which suggests that the curing temperature can be further increased. |
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