材料的选择包括水泥的品质、集料粒径、集料强度、颗粒形状和质地、化学外加剂、矿物掺合料等。
Selection of materials include characteristics of cement, particle size, intrinsic strength, shape and texture of aggregate, chemical admixtures and mineral admixtures, etc.
结果表明，高强次轻混凝土梁比轻集料混凝土梁的抗剪承载力有较大的提高，且比普通混凝土梁的抗剪强度大；
The tests indicated that the ultimate shear strength of it was a little larger than normal-weight concrete beam's, and larger than lightweight concrete beam.
纯弯段无腹筋的高强轻集料钢筋混凝土梁在破坏时表现出较强的脆性，延性要比同一强度等级普通混凝土梁略差。
And reinforced high-strength lightweight concrete beam is less ductile as compared with the normal-weight concrete beam of the same concrete strength.
结果表明，掺加上述微细集料可以有效地改善混凝土中水泥浆及界面结构，显著提高混凝土强度。
The results show that the addition of composite micro-aggregates to concrete can improve the structure of the mortar and interface, and greatly increase the compressive strength of concrete.
本文研究了粗集料的最大粒径、级配和压碎指标值等对路面混凝土抗折强度的影响。
The effect of maximum diameter, grading distribution and crushing index of coarse aggregate on flexural strength of concrete is investigated through experiments.
研究分析了再生粗集料不同取代率对再生混凝土各种强度指标的影响。
The influence of different recycled coarse aggregate (RCA) replacement ratios on the strength of recycled concrete was investigated.
采用再生粗集料配制混凝土时，强度和抗冻性均良好，但收缩较大。
When coarse reclaimed aggregate is used to prepare concrete, the concrete is good in strength and frost resistance and its shrinkage is rather great.
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.
目前国内生产的轻集料普遍存在强度偏低、吸水率偏高的质量问题。
At present domestic produced lightweight aggregate of lower strength and higher absorption of water is common.
和天然集料相比较，再生骨料具有强度低、表面粗糙、吸水率大并及含有结晶水等特点。
In contrast with natural aggregate, The feature of recycled aggregate is low intensity, Roughness surface, large absorbing water, Including crystal water and so on.
结果表明，用粉煤灰陶粒所配制的轻集料混凝土强度较高，干表现密度和热性能均能满足设计要求，而且更经济。
Study results show that sintered fly ash aggregate concrete is relatively high in strength and more economical in use, and its dry density and thermal properties can meet design requirements.
本项研究用混合型集料配制出了表观密度等级为1800，抗压强度等级为CL50的优质轻混凝土。
In this study, quality light aggregate concrete with 1800 grade of apparent density and CL50 grade of compressive strength was obtained, using mixed type aggregate.
集料对混凝土强度的影响是一个悬而未决的难题，许多学者一直致力于这方面的研究，并取得一定的成果。
The effect of aggregate on concrete still be a pending difficulty, therefore, numerous researcher study it constantly, and have made some achievements.
最后，针对再生粗集料取代率为100%的C20 ~C40再生混凝土主要强度指标的取值提出了建议。
Finally, some basic strength indexes of C20 ~ C40 recycled concrete with 100% RCA are proposed.
本文系统研究了粉煤灰掺量与品质、水泥剂量、集料级配等因素对材料强度的影响。
This manuscript studies elements such as content and quality of fly-ash, the cement content and aggregate's gradation influencing the material's strength.
结果表明，集料级配对二灰碎石的抗压强度有显著影响；
The result indicated that the aggregate gradation has a remarkable effect on the compression strength.
通常柔性是由以下内容来实现的：成比例的非连续级配集料混合物、高强度的沥青水泥用量以及有助于降低混合物稳定性的各种因素。
Generally, flexibility is enhanced by relatively open-graded aggregate mixtures and high asphalt cement contents, factors which contribute to a lower mixture stability.
研究了细集料种类、粒径大小及分布对低孔隙率砂浆强度性能的影响。
Influences of nature Particle, size and distyibution of micro-aggregates on the mechanical properties of very low porosity mortar were investigated.
根据室内试验的结果，采用直观分析和方差分析方法分析了集料级配对二灰碎石混合料不同龄期抗压强度的影响。
The effects of aggregate gradation on lime-fly ash bound macadam "s compression strength in varied ages were analyzed. The direct-vision and variance analysis were adopted in indoor tests."
通过与石灰石集料的对比研究发现，辉绿岩作集料配制出的混凝土无论在坍落度，还是在强度等方面均优于石灰石混凝土。
It "s discovered that the diabase aggregate concrete is better than the limestone aggregate concrete on the slump and the intensity of concrete."
通过与石灰石集料的对比研究发现，辉绿岩作集料配制出的混凝土无论在坍落度，还是在强度等方面均优于石灰石混凝土。
It "s discovered that the diabase aggregate concrete is better than the limestone aggregate concrete on the slump and the intensity of concrete."
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