西安建筑科技大学学报(自然科学版)

为了研究水胶比对混凝土强度的影响规律,本文自主设计并配制了强度等级为C50、C60型号高强度混凝土,建立了水胶比与混凝土7 d龄期和28 d龄期抗压强度之间的函数关系式,并分析了强度增量随水胶比变化的原因.结果表明,随着水胶比增加,混凝土抗压强度呈降低趋势,符合一次线性函数关系; 7 d后强度增量和相对增长率随着水胶比增长而减小,基本呈直线下降.因此,水胶比将直接影响混凝土性能,若要获得高强度的混凝土,设计合理的水胶比是关键.经综合分析评价,高强度混凝土的水胶比存在着一个合适范围,当水胶比为0.29时,混凝土的性能最优.

In order to study the influence of water-binder ratio on the strength of concrete, the strength grade of C50 and C60 type of high strength concrete were designed and prepared independently, where the functional relationship between water to binder ratio and compressive strength of concrete at seven and twenty-eight days of age were established. The reason why the strength increment varies with the ratio of water to binder was analyzed. Results show that the compressive strength of concrete decreases with the increase of water to binder ratio, which accords with the primary linear function relation, and the strength increment and relative growth rate decrease with the increase of water to binder ratio after 7 days, and nearly decrease in a straight line. Therefore, the water-binder ratio will directly affect the performance of concrete, and if we want to obtain high strength concrete, the design of reasonable water-glue ratio is the key. After comprehensive analysis and evaluation, there is a suitable range for the water-binder ratio of high strength concrete, and the performance of concrete is optimal when the water-binder ratio is 0.29.

引言
1 实验材料和方法
2 结果与分析
3 结语

表1 高强度混凝土各原材料用量和配比<br/>Tab.1 Content and proportion of raw materials in high strength concrete

表1 高强度混凝土各原材料用量和配比
Tab.1 Content and proportion of raw materials in high strength concrete

图1 混凝土强度测试系统<br/>Fig.1 Concrete strength test system

图1 混凝土强度测试系统
Fig.1 Concrete strength test system

表2 实验用高强度混凝土性能<br/>Tab.2 Performance of high strength concrete for experiment

表2 实验用高强度混凝土性能
Tab.2 Performance of high strength concrete for experiment

图2 配制的两种高强度混凝土实测强度与标准强度的比值<br/>Fig.2 The ratio of the measured strength to the standard strength of the two prepared high-strength concrete

图2 配制的两种高强度混凝土实测强度与标准强度的比值
Fig.2 The ratio of the measured strength to the standard strength of the two prepared high-strength concrete

图3 高强度混凝土水胶比与7 d抗压强度的关系<br/>Fig.3 Relationship between water-binder ratio of high strength concrete and compressive strength for 7 days

图3 高强度混凝土水胶比与7 d抗压强度的关系
Fig.3 Relationship between water-binder ratio of high strength concrete and compressive strength for 7 days

图4 高强度混凝土水胶比与28 d抗压强度的关系<br/>Fig.4 Relationship between water-binder ratio and 28-day compressive strength of high strength concrete

图4 高强度混凝土水胶比与28 d抗压强度的关系
Fig.4 Relationship between water-binder ratio and 28-day compressive strength of high strength concrete

图5 水胶比与高强度混凝土7 d后强度增量的关系<br/>Fig.5 Relationship between water-binder ratio and strength increment of high strength concrete after 7 days

图5 水胶比与高强度混凝土7 d后强度增量的关系
Fig.5 Relationship between water-binder ratio and strength increment of high strength concrete after 7 days

图6 高强度混凝土水胶比与7 d后强度增长率的关系<br/>Fig.6 The relationship between cement ratio of high-strength concrete and the growth rate of strength after 7 days

图6 高强度混凝土水胶比与7 d后强度增长率的关系
Fig.6 The relationship between cement ratio of high-strength concrete and the growth rate of strength after 7 days

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备注

引言

1 实验材料和方法

2 结果与分析

3 结语

期刊信息