由于施工程序的原因，进行超声检测的基桩混凝土龄期往往不足28天。
Due to the process of the construction, the life-span of the stake-base concrete being detected by the ultra-sound is usually less than 28 days .
利用概率的方法，确定开裂概率和临界开裂风险来评价混凝土结构的早龄期开裂的可能性大小，并在混凝土挡土墙工程中应用。
The probability of concrete structure cracking at early age is estimated by cracking probability and critical cracking risk with probabilistic method for a real case of concrete wall.
利用概率的方法，建立分析早龄期混凝土开裂的数学模型，并利用一实际的混凝土挡土墙工程观测结果进行验证。
A mathematic model is set up by probabilistic method for analyzing concrete crack in early age, which is tested by the observation results of a concrete retaining wall case.
不同加载龄期混凝土的徐变规律。
减水率达25%，坍落度损失低，各龄期混凝土抗压强度都有较大提高。
And water reducing ratio of concrete is 25%, slump lose a little. Its every age compressive strength has increased obviously.
与有限元软件一起使用，等效龄期方法还可以运用于混凝土结构的温度裂缝预测与控制中；
The equivalent age method is extended successfully to the concrete cracking control in structures through the use of the finite element program ANSYS.
温度变形和自生变形是硬化混凝土在初龄期两种最主要的变形。
Temperature deformation and autogenous deformation are the two major forms of deformation of hardening concrete in early age.
因此，对混凝土﹑水泥砂浆建议在7天龄期后进行测试，对环氧树脂砂浆建议在3天龄期后进行试验。
So the suggestions of the concrete and mortar to be tested after 7 days and the epoxy resin mortar to be tested after 3 days are given.
对一批不同龄期的掺粉煤灰或矿渣的钢纤维混凝土试件进行了超声波检测及抗压强度试验。
The steel fiber concrete with fly ash and slag of different ages by ultrasonic detection and compression strength were tested.
利用直流双电极法研究了碳纤维砂浆（CFRM）和碳纤维混凝土（CFRC）的导电性能与其龄期之间的关系。
The relationships between DC resistance of carbon fiber reinforced mortar (CFRM) and carbon fiber reinforced concrete (CFRC) and curing age were studied by using the two-probe method.
经工程实践验证了该曲线的测试精度，建议可作为郑州市早龄期磨细矿渣混凝土回弹法的专用测强曲线。
The accuracy of the curve is tested and verified by the practical engineering, and the curve can be used as the curve for early-age ground slag concrete strength by rebound method in Zhengzhou.
文章对未达到设计龄期的混凝土刚度取值进行了探讨，并将计算结果与现场实测结果进行对比分析。
In this paper, the stiffness value which does not meet the design age of the concrete are discussed.
研究表明，早龄期混凝土致裂应力主要与徐变和内外约束有关。
The results showed that the concrete cracking stress at the early age was associated with the creep and internal and external constraints directly.
低龄期混凝土表面开裂问题已成为工程界普遍关注的问题。
The cracking problem of early age concrete surface has aroused general concern in engineering circles.
由于沥青混凝土可快速修补，修补后没有龄期要求即可蓄水，因此采用沥青混凝土护面具有一定的优越性。
Because the asphalt concrete can be repaired quickly and it can impound water immediately after repairing, the adoption of asphalt concrete facing has certain advantage.
基体的强度和弹性模量从零开始增加，到一定龄期后接近集料分散相，对于轻集料混凝土，基体的强度和刚度在一定龄期还将超过集料分散相。
The strength and modulus of elasticity of matrix increase from almost zero, then at a certain age up to those of the coarse aggregate, and even exceed for lightweight concrete.
早龄期时混凝土结构内应力的计算为优化混凝土材料的组成提供了依据，尽可能减少混凝土结构的开裂。
The optimization of mix composition of concrete according the calculation of inner stress at early age may reduce the cracking risk of concrete structure.
由于混凝土的力学特性随施工龄期变化，导致响应的时变性，如弹性模量。
Because the changes of the concrete structure dynamics properties will happen during pouring process, the responses are the transient responses. For example, the elastic modules.
采用有限差分方法，建立了基于混凝土绝热温升试验的早龄期混凝土温度场计算模型。
A finite difference model for predicting temperature fields in early age concrete is presented based on adiabatic test on concrete.
分析结果表明：无论哪种龄期，PVA纤维混凝土梁的韧性要比普通混凝土梁高，且随纤维含量的增加而增大；
The result indicates:the toughness of PVA fiber concrete beams is higher than common concrete in any concrete ages, and increasing with PVA fiber volume ratios increasing.
最终运用本模型对加载龄期和粗骨料、水泥砂浆比参数进行了分析，给出了粉煤灰混凝土徐变的规律。
Finally using the model loading age and coarse aggregate, cement ratio parameters were analyzed, and the laws of fly ash concrete creep are present.
初龄期混凝土犹如刚出生的婴儿一样，需要给予细心的呵护。
Concrete at early age behaves as just born baby, it needs pay attention to protect.
载体能参予多孔混凝土中的胶凝材料的水化过程，故该种多孔混凝土的强度和性能随着龄期增长而提高和改善。
The carrier can participate in the hydration of the binding material in the porous concrete, so the strength and behaviour of this kind of porous concrete are improved with the age.
固结波速在混凝土7天龄期内变化尤为显著，这弥补了现有的混凝土无损检测技术不能应用于检测早龄期(特别是7天龄期以前)混凝土强度这一空白。
The consolidating wave speed changes distinctly in 7 days, so it makes up the loss that in being non-destructive testing technology couldn't be used to test the fresh concrete strength.
试验研究了水泥用量、矿物掺合料、龄期对高性能混凝土收缩、徐变的影响规律。
The laws of influences from usage amount of cement, mineral admixtures and concrete age on shrinkage and creep of high performance concrete are studied through tests.
采用热-结构耦合分析的方法对水化热引起的空心薄壁墩的温度效应进行分析，计算中考虑了混凝土弹性模量随龄期的变化。
This paper obtained the temperature effect caused by heat of hydration in hollow thin pier by thermal-stress analysis, considering the change of elastic modulus followed by time.
早龄期混凝土的水化、凝结过程对混凝土的后期强度、耐久性是非常重要的。
The process of hydration and solidification of young concrete have a significant influence on the long term strength and durability of concrete.
水胶比相同时，不同龄期的混凝土强度与粉煤灰掺量呈二次曲线关系。
The comparative studies of the different fly ash concrete has been carried.
地震前已浇筑的未达龄期混凝土的处置是地震后在建工程项目复工的必要条件。
Treatment of early age concrete poured before earthquake is necessary condition for continuing construction in process after earthquake.
地震前已浇筑的未达龄期混凝土的处置是地震后在建工程项目复工的必要条件。
Treatment of early age concrete poured before earthquake is necessary condition for continuing construction in process after earthquake.
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