New testing technology for large-diameter cast-in-situ pile integrity based on temperature measurement of hydration heat of concrete
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摘要: 现有的大直径灌注桩的完整性检测技术存在一定的不足与缺陷。提出了基于混凝土水化热的大直径灌注桩桩身完整性检测新技术。无论何种桩身缺陷,同正常混凝土的相比,在水化、凝结、硬化过程中,释放热量普遍偏少。桩身夹泥等缺陷体甚至不释放热量。同时,缺陷体对热量的传导能力普遍较差。可以通过精确测量大直径灌注桩混凝土水化热而产生的温度梯度,进而判定桩身完整性。通过现场试验验证了该技术的可行性,值得深入研究与进一步推广应用。Abstract: There is certain lack in the current integrity tests on large-diameter cast-in-situ piles. A new technology is proposed based on the hydration heat of concrete. Compared with the normal concrete, no matter what kind of pile defects, the release of the heat is generally on the low side in the hydration, setting and hardening process. Mud and other pile defects do not even release heat. Meanwhile, the thermal conductivity of pile defects is generally poor. Concrete hydration heat and the resulting temperature gradient of the large-diameter cast-in-situ piles can be measured accurately, and thus the pile integrity is determined. The technical feasibility is demonstrated by field trials, which is worth of application and extension based on next thoroughgoing research.
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