| 杨 珊,许发俊,陈 娇,吴福飞,何昱瑶,谢 琰,胡宏寅.低气压养护下水泥掺量对水泥土物理性能的影响*[J].水泥工程,2024,37(5):19-23 |
| 低气压养护下水泥掺量对水泥土物理性能的影响* |
| Effect of cement admixture on the physical properties of cement soil under low-pressure curing |
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| DOI： |
| 中文关键词: 水泥土,低气压养护,耐久性,无侧限抗压强度 |
| 英文关键词: cement soil, hypobaric curing, durability, unconfined compressive strength |
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| 中文摘要: |
| 为了探究低气压养护环境下不同水泥掺量对水泥土物理性能的影响，通过自制低气压试验箱模拟高海拔地区水泥土的养护条件，研究了7 d和28 d不同低气压梯度（100 kPa、70 kPa、40 kPa）养护下，水泥掺量（12%、15%、18%）对水泥土密度、吸水率、孔隙率及无侧限抗压强度的影响规律。结果表明：低气压养护对水泥土密度、吸水率、孔隙率及抗压强度影响效果显著。水泥掺入量为12%时，不同低气压养护和不同龄期条件下水泥土密度最高。在7 d，同一低气压下水泥土吸水率随水泥掺量的增加而降低。对于孔隙率，适当的水泥掺量能促使水泥土孔隙率变小，而低气压养护和龄期的延长会导致水泥土孔隙率增加。低气压养护下，降低水泥用量可以增大水泥土抗压强度，节约成本的同时还能增强水泥土力学性能。 |
| 英文摘要: |
| In order to investigate the effect of different cement contents on the physical properties of cement soil under low-pressure curing environment, a self-made low-pressure test chamber was used to simulate the curing conditions of cement soil in high-altitude areas. The influence of cement content (12%, 15%, 18%) on the density, water absorption rate, porosity and unconfined compressive strength of cement soil under different low-pressure gradients (100 kPa, 70 kPa, 40 kPa) curing for 7 d and 28 d was studied. The results indicate that low-pressure curing has a significant effect on the density, water absorption, porosity, and compressive strength of cement soil. When the cement content is 12%, the cement soil density is highest under different low-pressure curing and different age conditions. At 7 d, the water absorption rate of cement soil decreases with the increase of cement content under the same low pressure. For porosity, appropriate cement dosage can promote a decrease in porosity of cement soil, while low-pressure curing and prolonged aging can lead to an increase in porosity of cement soil. Under low-pressure curing, reducing the amount of cement can increase the compressive strength of cement soil, save costs, and enhance the mechanical properties of cement soil. |
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