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compressive strength of concrete     
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  混凝土抗压强度
     Visual Basic-based data processing system for compressive strength of concrete detected by rebound method
     基于Visual Basic的回弹法检测混凝土抗压强度数据处理系统
短句来源
     With the same amount of cementitious material, compressive strength of AAS concrete is 2~4 times and the permeability is 1/3~1/5 times comparison with normal concrete, and the compressive strength of concrete is able to exceed 100 MPa under the condition of steam curing for 8 hours at 85 ℃.
     在同样胶材用量下 ,AAS混凝土抗压强度为普通混凝土的 2~ 4倍 ,渗透性为普通混凝土的 1/ 3~ 1/ 5。 在 85℃、8h蒸养条件下 ,混凝土制品抗压强度可超过 10 0 MPa
短句来源
     Experimental study about effect of coarse aggregate strength on compressive strength of concrete
     粗集料强度对混凝土抗压强度影响的试验研究
短句来源
     The compressive tests of concrete specimens suffering 0、25、50、75 and 100 cycles of freezing and thawing respectively in 3.5% sodium chloride solution imitated seawater were completed,using the large static-dynamic triaxial test system for concrete. The influence of cycles of freezing and thawing on the compressive strength of concrete,elastic modulus and stress-strain relationship is tested,and the concise mathematics formula is established.
     采用快速冻融方法,对模仿海水的3 5%NaCl溶液中的混凝土进行0、25、50、75、100次冻融循环,利用大型混凝土静、动三轴试验系统,检测了冻融循环对海水中混凝土抗压强度、弹性模量及应力-应变关系的影响,建立了简明的数学表达式。
短句来源
     This paper introduces the ultrasonic-rebound comprehensive testing method used for determination of concrete strength, analyzes the relationship be tween the strength obtained by using ultrasonic-rebound comprehensive testing m ethod and the compressive strength of concrete, and also analyzes the influence of the water ratio, steel ratio and other factors on the strength obtained by us ing ultrasonic-rebound comprehensive testing method.
     介绍了超声回弹综合法测混凝土抗压强度的研究方法,分析了超声回弹综合法测强度与混凝土抗压强度之间的关系,并就含水率、钢筋含量等因素对超声回弹综合法强度的影响进行了分析。
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  砼抗压强度
     Study on the coarse asgregate from a sandpit, Beijing shows that compressive strength of concrete containing the agsregate was decreased 10 to 20 MPa when unit alkali content of concrete was 6. 0kg/m3. And the strength was decreased 25 MPa when unitalkali Content was 9. 0/m3. Micro-analysis illustrates there existed the characteristics of alkali-aggregate reaction inner aggreggate and in the edge of the aggregate of above concrete specimeus
     对北京某砂石场的粗集料研究表明,当单位碱含量达6.0kg/m3时,砼抗压强度降低10~20MPa; 碱含量为9.0kg/m3时,抗压强度降低25MPa左右.微观分析表明.上述砼试件中,部分粗集料内部和边界存在碱-集料反应特征.
短句来源
     On the basis of experimental observation and analysis of taxial stress-strain curves of normal and high strength concrete,we can know:the higher the compressive strength of concrete,the larger the elasticity modules of concrets.
     通过对普通和高强混凝土在单轴受压时的应力、应变分析发现:混凝土的弹性模量随砼抗压强度的提高而提高,混凝土弹性段的范围随混凝土强度的提高而增大;
短句来源
  混凝土立方体抗压强度
     Based on the theoretical model of carbonation and analysis on plenty of spot data and weather data, the model of predicting average carbonation depth is proposed This model takes the compressive strength of concrete as the main parameter, and considers influence of temperature, moisture , and concentration of carbon dioxide Taking into account the randomicity of the carbonated process, the random model of predicting the carbonated concrete depth is presented in the basis of the preceding model At last, this random model is validated by spot date
     从碳化理论模型出发,利用大量工程实测结果和气象调查资料,建立了以混凝土立方体抗压强度标准值为主要参数,考虑环境影响(环境温湿度)和CO2浓度影响的平均碳化深度预测模型,进一步考虑碳化过程的随机性,提出了预测混凝土碳化深度的随机模型。 最后,用工程实测数据对模型进行了验证分析。
短句来源
     Two types of core samples with dimension of  100 mm and  70 mm in diameter are prepared,which were cored from high strength concrete of 50~90 MPa compressive strength. Then,their compressive strength were measured and compared with cubic compressive strength of concrete under same curing conditions.
     针对采用不同粗骨料配制的50~90 MPa混凝土,分别钻取尺寸为100 mm和70 mm两种芯样,测定其抗压强度,并与同条件养护的混凝土立方体抗压强度进行比较。
短句来源
  对混凝土抗压强度
     Experimental study about effect of coarse aggregate strength on compressive strength of concrete
     粗集料强度对混凝土抗压强度影响的试验研究
短句来源
     Study on Effect of Coarse Aggregates on Compressive Strength of Concrete
     粗集料对混凝土抗压强度影响的研究
短句来源
     Influence of Recycled Coarse Aggregate Replacement Percentages on Compressive Strength of Concrete
     再生粗骨料取代率对混凝土抗压强度的影响
短句来源
     Effect of High Temperature Curing on Compressive Strength of Concrete
     早期高温养护对混凝土抗压强度的影响
短句来源
     Compressive strength of concrete was also influenced by the orientation of steel fibers.
     钢纤维分布形式的不同对混凝土抗压强度也有一定影响。
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      compressive strength of concrete
    Passively confined tests of axial dynamic compressive strength of concrete
          
    Currently, there is no single method for nondestructive determination of compressive strength of concrete.
          
    The aggregate content mainly acts as a filler but also influences the compressive strength of concrete.
          
    The compressive strength of concrete for the first group of six columns was about 40 MPa, whereas concrete with a compressive strength of about 60 MPa was used in the other six columns.
          
    The experimentally obtained average compressive strength of concrete was 30?MPa.
          
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    Presented in this paper are results of experimental studies of the effect of water-reduclng retarder 3FG—2on the setting time of concrete and cement paste as well as the effect on“peak time”(time to reach maximum temperature)of job concrete. Through the use of the water-reduclng retarder 3FG—2 in a small scale concrete job it was shown that water content of concrete might be reduced as much as about 15 per cent and compressive strength of concrete increased about 30 per cent at age of 28 days or cement...

    Presented in this paper are results of experimental studies of the effect of water-reduclng retarder 3FG—2on the setting time of concrete and cement paste as well as the effect on“peak time”(time to reach maximum temperature)of job concrete. Through the use of the water-reduclng retarder 3FG—2 in a small scale concrete job it was shown that water content of concrete might be reduced as much as about 15 per cent and compressive strength of concrete increased about 30 per cent at age of 28 days or cement cont- ent of concrete might be reduced about 15 per cent without affecting the compressive strength of concrete. Continuous experimental work both in laboratory and in field on water-reduclng retarder 3FG—2 resulst a further helpful knowledge con- cerning it and raises the confidence of its use on the job.Significant advantages are obtaind with the use of this water-reducing retarder in job concrete particulary in warm weather.

    本文介绍以制糖及烤胶工业的废渣所制取的新型混凝土减水缓凝剂3FG-2的特性及其对水泥混凝土性能的影响,以及用于大化水也站工程的初步效果。

    In this paper the optimum design of the temperature control for mass concrete dams has been researched by using the non-linear programme. The optimum design is considering the minimum relative construction costs as the principle, taking x1 (the compressive strength of concrete) ,x2 (drop placing temperature by adding ice to mix water),x3 ( drop placing temperature by precooling aggregate of concrete),x4 (drop temperature of concrete by initial cooling) ,x5 ( number of concrete blocks...

    In this paper the optimum design of the temperature control for mass concrete dams has been researched by using the non-linear programme. The optimum design is considering the minimum relative construction costs as the principle, taking x1 (the compressive strength of concrete) ,x2 (drop placing temperature by adding ice to mix water),x3 ( drop placing temperature by precooling aggregate of concrete),x4 (drop temperature of concrete by initial cooling) ,x5 ( number of concrete blocks ) and x6 ( the lift thickness of placing)as variables. For some variables are integeral and discontinuous, the problems were solved by mesh method and complex method. FORTRAN-IV computer programs have been made and examples of their application in engineering are given. The program may be widely used in designs and constructions.

    本文应用非线性规划理论,研究了混凝土坝浇筑块基础温差的合理选择问题。文中按相对造价最低为原则,以混凝土标号X_1、加冰降温值X_2、予冷骨料降温值X_3、一期水管冷却降温值X_4、分块数目X_5和分层厚度X_6等六个因素为设计变量。由于某些变量的整型要求和其不连续性,问题的求解采用了网格法和复形法,并用FORTRAN-Ⅳ语言编制了计算机程序,给出了工程计算实例,可广泛应用于设计和施工中。

    In this paper, several factors that influenced the cross-sectional ductility (such as the rate of steel content and the ratio of axial force to the compressive strength of concrete etc.) are studied here through the experiments of 38 reinforced ceramite concrete beams and columns. The relation between the moment-curvature and the load-displacement of the reinforced ceramite concrete members during the stage from cracking to failure have been tested and the results are being discussed here....

    In this paper, several factors that influenced the cross-sectional ductility (such as the rate of steel content and the ratio of axial force to the compressive strength of concrete etc.) are studied here through the experiments of 38 reinforced ceramite concrete beams and columns. The relation between the moment-curvature and the load-displacement of the reinforced ceramite concrete members during the stage from cracking to failure have been tested and the results are being discussed here. According to the experiment results, the empirical formulas of the ductility ratio of the displacement of the reinforced ceramite concrete members by the action of bending moment or the bending moment combined with axial force are concluded here. The complete moment-curvature curves are obtained from theoretical analysis by using electronic computer, and they are almost in agreement with the experimental curves.

    本文通过38根钢筋陶粒混凝土梁、柱的试验,探讨了配筋率和轴压比等因素对梁柱截面延性的影响。研究了铜筋陶粒混凝土构件从开裂到破坏各阶段的弯矩—曲率和荷载—位移关系。根据试验结果归纳出钢筋陶粒混凝土构件在弯矩及弯矩和轴力联合作用下位移延性比的经验公式。利用电子计算机对弯矩—曲率曲线全过程作了理论分析,并与试验结果进行了比较,两者比较接近。

     
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