介绍了一套高性能混凝土的约束收缩试验方法。
A test method for restrained shrinkage of high performance concrete is introduced.
自由收缩对混凝土并无不良影响，约束收缩是混凝土开裂的源动力。
Restrained shrinkage of concrete is a main source of cracks in concrete.
为实现这一目的，作者研究了砂浆的自由收缩规律与混凝土的环形约束收缩规律。
On this purpose, the performence of free shrinkage of mortar and restrained shrinkage of concrete were studied.
在自密实混凝土与老混凝土约束收缩试验的基础上，本文采用大型有限元软件ABAQUS进行了新老混凝土粘结的约束收缩模拟，并与试验结果进行比较，以验证有限元模型的可行性。
Based on the test results of adherence of self-compacting concrete to old concrete, the restrained shrinkage of adhesion between new and old concrete is simulated by finite element program ABAQUS.
首次利用约束热处理结合热机械训练获得了加热伸长、冷却收缩的双向记忆效应弹簧，其伸长率达60%。
A TWSME extension spring, which can extend upon heating and contract upon cooling was obtained using constrained annealing and thermo-mechanical training, the elongation can reach 60%.
本文应用板式混凝土早期收缩开裂试验架成型约束状态的混凝土大板，并在大板的中心位置、对角线位置和十字区域取芯制取试件。
Concrete plates under restrained condition were prepared using special plate molds and specimens drilled in the central position, diagonal position and crisscross position of the concrete plates.
江津观音岩长江大桥为结合梁桥，为防止桥面板湿接缝在约束条件下产生裂缝，该桥面板湿接缝要求采用微膨胀混凝土，以补偿混凝土的收缩、徐变。
In order to prevent the cracks that would be likely caused by restricted conditions of the wet-joint, the wet-joint demands using expansive concrete to compensate the shrinkage and creep.
温度变形和自生收缩变形等受约束形成的拉应力，是引起混凝土早期开裂的主要驱动力；
The tensile stress induced by restrained thermal and autogenous shrinkage deformations was the main driving force of cracking in concrete at early age.
本文提出一个求解约束工程设计问题的新的混合算法—与可行基规则相结合的局部收缩微粒群算法。
This paper the hybrid local constriction particle swarm optimization (HLPSO) with a feasibility-based rule is proposed to solve constrained engineering design problems.
自由收缩值不能直接用于评价混凝土的抗裂性能，试验必须在约束条件下进行。
It has been proved that shrinkage can't be used as the indicator of crack resistance of concrete and the evaluation experiments should be carried out under restrained conditions.
阐述了砼结构体表比和约束比对温度和收缩应变和裂缝的影响程度，推导出R．C结构在四周无变位边界约束条件下的温度和收缩应变、应力及裂缝宽度计算公式和运用实例。
The formula of strain and crack width of temperature and contraction with no varying place constraint con detion are deduced, capale be design basis for crack control of R. C structure.
另一方面由于混凝土的收缩受到土的约束，底板会产生拉应力。
On the other hand, the tensile stress will appear due to the concrete's shrinkage restricted by the earth.
自由收缩值不能直接用于评价水泥基材料的抗裂性能，试验必须在约束条件下进行。
It had been proved that the free shrinkage can't be used to evaluate crack resistance of concrete directly and the evaluation experiments should be carried out under restrained circumstance.
自由收缩值不能直接用于评价水泥基材料的抗裂性能，试验必须在约束条件下进行。
It had been proved that the free shrinkage can't be used to evaluate crack resistance of concrete directly and the evaluation experiments should be carried out under restrained circumstance.
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