We usually measure the strength of concrete at 28 days after it has been cast.
我们通常在混凝土灌注后二十八天测 定其强度。
The test results indicated that the strength of concrete could be estimated by supersonic velocity values.
结果表明由超声波测试得到的声速值可以方便地估算出混凝土的强度。
Used in production, it will decrease the cost, improve the strength of concrete and the capacity of mixer.
该工艺的应用可降低生产成本，提高混凝土的强度和生产率。
Selected the optimal combination. (4) BP neural network used to predict the strength of concrete strength.
选出了最优组合。（4）采用BP神经网络对混凝土强度进行强度预测。
The special structure of zeolite increase the strength of concrete with a large amount of zeolite after one year.
沸石的独特结构使大掺量沸石粉的混凝土强度增幅较大。
The influence of different cooling conditions and different heating loading paths on the strength of concrete is presented.
不同降温方式、升温-加载途径对混凝土强度的影响；
For the concrete which losing water is little at early-age, strengthen curing, the strength of concrete will be compensated.
对早期失水较少的混凝土，加强湿养护，混凝土强度能得到较大的补偿。
It is often believed that the higher the strength of concrete, the lower of its permeability, and the better of its durability.
一般认为，混凝土的强度越高，其渗透性越低，以及耐久性越好。
Such as testing the strength of concrete, not of the same age and some of the effects of phase mixing on the impact of the test.
如混凝土强度的检测范围，不同龄期的影响及部分掺加剂对测试的影响等。
In this paper, the effects of fly ash, ground slag and composite admixture of them on the strength of concrete were investigated.
研究了单掺粉煤灰、磨细矿渣及它们复合后的复合掺合料对混凝土强度的影响。
In addition, the promoting of glucose-acid Na added with the super plasticizers into HPC can highly improves the strength of concrete.
另外，在高性能混凝土中，葡萄糖酸钠与高效减水剂复配，还可提高混凝土的后期强度。
The linear relationship between the strength of concrete and the point load to crush the small concrete cores has been determined by experiments.
本文通过试验得出了砼强度与砼小芯样的横劈荷载值间的线性关系。
And the Stone Enveloped with Cement can meliorate distinctly the structure of the transition zone of interface, thus the strength of concrete is improved.
“净浆裹石”搅拌工艺可以大大改善界面过渡区结构，从而提高混凝土的强度。
Such as sand not clean (mud high content), sand the fineness modulus too high or too low, also can make the strength of concrete is reduced, and the water increased.
如砂石不干净(泥含量较大)、砂的细度模数过高或过低等，也会使混凝土强度降低、泌水性增加。
Studies for the mechanical properties of concrete are very important to increase the strength of concrete material, improve design level and reduce the construction cost.
其力学特性的研究对充分发挥材料的强度，提高设计水平和降低工程造价具有十分重要的意义。
The strength of concrete and steel decrease a lot after exposure to fire. As a result, the seismic performance of concrete-filled steel tubular (CFST) columns may be changed.
火灾后组成钢管混凝土的钢材和混凝土力学性能的降低，可能造成钢管混凝土柱抗震性能的改变。
It was studied that the effect of the quantity of steel slag and silica fume on concrete strength and fluidity as well as the rule of the strength of concrete with steel slag and silica fume.
研究了钢渣、硅粉掺量对混凝土强度与流动性的影响以及钢渣、硅粉混凝土强度规律。
With high dispersity and high activity, silica fume is a specific additive for cement and concrete, capable of distinctly improving the performance of concrete and upgrading the strength of concrete.
作为高分散度和高活性材料，硅粉是一种特效的水泥、混凝土掺合料，它能明显地改善混凝土的性能，提高混凝土的强度。
It is with the strength of these emotions, as well as the concrete, glass and steel that is brought in day by day, that we will build on the footprints of the past the foundation of the future.
正是因为这些情感的力量，以及一天天堆积起来的混凝土、玻璃和钢筋，我们在过去的脚印上重新出发，为未来铺平道路。
The vaulting gives the house plenty of structural strength but does away with the need for energy-intensive materials such as reinforced concrete.
拱形结构为房屋提供了足够的结构强度而无需混凝土这样的能源密集型材料。
The strength of the real-estate market directly affects the construction, steel, concrete, power and appliance industries.
房地产市场景气与否直接影响到建筑、钢铁、水泥、电力和家电行业。
It is very important for concrete designer and for concrete construction to know the time of the concrete grows this critical strength.
找到达到这个强度所需的时间，对于指导混凝土配合比设计和混凝土施工有着重要的意义。
Effect of fly ash on the workability, strength and hydration heat of high belite cement and concrete.
粉煤灰对高贝利特水泥和混凝土的工作性、强度及水化热的影响。
In the conservation process, the control should be in favor of hardening concrete strength and growth temperature environments.
在养护过程中，应控制混凝土在有利于硬化及强度增长的温度环境中。
The primary advantage of vibrating is that it permits the use of a drier concrete, which has a higher strength because of the reduced water content.
该振动的主要优点是它允许一个干燥混凝土，其中有一个因减少水的使用量较高的强度。
The proper evaluation of concrete strength is the principal part of the acceptance of concrete work.
混凝土强度的正确评定是混凝土分项工程质量验收与评定的主要组成部分。
The law shows that, along with the static pre-load increasing, the dynamical bending strength of concrete would go up to a peak value and then move downward to the static strength.
计算结果显示，不同细观骨料模型具有相似的规律，即随预静载增大，混凝土动弯拉强度上升，至一定峰值后回归到静载强度。
The results show that the dry density, bending strength and compressive strength of foam concrete block decreased with the increasing of the amount of foam.
研究结果表明：泡沫加入量增加，泡沫混凝土砌块的干密度逐步减小，抗折和抗压强度递减。
The results show that the dry density, bending strength and compressive strength of foam concrete block decreased with the increasing of the amount of foam.
研究结果表明：泡沫加入量增加，泡沫混凝土砌块的干密度逐步减小，抗折和抗压强度递减。
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