本文研究了普通混凝土在硬化初期受到一次冻结或反复冻融后对质量的影响。
In this article, it has made a research of the quality of an early-stage setting ordinary concrete undergoing a freezing test or repeated freezing and thawing test.
本文实验研究了低温养护对普通混凝土和高性能混凝土的抗压强度的影响。
This paper experimental studies the effect of low temperature reservation on ordinary concrete and high performance concrete.
用试验与数值计算方法研究了普通方钢管混凝土柱的轴压承载能力。
The enhancement of the axial bearing capacity of ordinary square concrete-filled steel tubes was investigated experimentally and numerically.
对18根不同长细比和含钢率的钢管轻集料混凝土长柱进行轴压试验，研究了钢管轻集料混凝土长柱在轴心压力下的受力性能，并与钢管普通混凝土进行了对比。
Based on axial compression tests of 18 lightweight aggregate concrete-filled steel tube (LACFST) long columns, the behavior of LACFST long columns was studied and compared with that of normal CFST.
首先总结了前人的工作，研究了超声波在钢管和混凝土内部的传播机制，证实了超声波与普通声波的异同点。
This thesis has summarized formerly people's work and researched the spreading principle, then similarities and differences between the ultrasonic wave and ordinary wave.
研究了石屑用于普通混凝土的可行性及配合比设计方法。用石屑取代河砂50%，并通过粉煤灰、河砂、石屑和石子等混凝土各组成成分之间的相互填充来实现密级配。
The feasibility of using attle in ordinary concrete is studied. 50% sand replaced with attle, a dense-grading system is obtained with fly ash, sand, attle and stone.
在实验室研究了普通水泥混凝土和掺粉煤灰水泥混凝土在自然条件下的碳化规律，历时10年。
An experimental study on the regularity of carbonation for cement concrete and con-crete admixed with fly ash in natural condition has been carried out in laboratory for 10years.
在实验室研究了普通水泥混凝土和掺粉煤灰水泥混凝土在自然条件下的碳化规律，历时10年。
An experimental study on the regularity of carbonation for cement concrete and con-crete admixed with fly ash in natural condition has been carried out in laboratory for 10years.
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