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4.1 For a given concrete and a given test apparatus, pullout strengths can be related to compressive strength test results. Such strength relationships are affected by the configuration of the embedded insert, bearing ring dimensions, depth of embedment, and the type of aggregate (lightweight or normal weight). Before use, the relationships must be established for each test system and each new concrete mixture. Such relationships are more reliable if both pullout test specimens and compressive strength test specimens are of similar size, consolidated to similar density, and cured under similar conditions.
4.2 Pullout tests are used to determine whether the in-place strength of concrete has reached a specified level so that, for example:
In addition, post-installed pullout tests may be used to estimate the strength of concrete in existing constructions.
4.3 When planning pullout tests and analyzing test results, consideration should be given to the normally expected decrease of concrete strength with increasing height within a given concrete placement in a structural element.
4.4 The measured pullout strength is indicative of the strength of concrete within the region represented by the conic frustum defined by the insert head and bearing ring. For typical surface installations, pullout strengths are indicative of the quality of the outer zone of concrete members and can be of benefit in evaluating the cover zone of reinforced concrete members.
SmartRock2在混凝土浇筑之前装在混凝土模板或绑扎在钢筋上,每隔30分钟测量一次温度值并记录在传感器内存中,使用智能手机上免费的app应用软件,可在智能手机上实时显示温度和强度。这些无线传感器提供更精确的读数和预估强度,完全符合成熟度有关的ASTM C1074 标准,以及ACI、CSA和DoT规范。结果证实比现场圆柱体破坏测试更精确。...
提高含水量或添加化学外加剂将增加混凝土的和易性。水分过多则会造成表面渗水增加或骨料偏析,进而导致混凝土质量降低。使用不良等级的骨料会导致拌合物干硬性较高,坍落度较小,并且要想通过加入适量的水来改善其和易性也很不容易实现。和易性可以通过混凝土坍落度试验测定,这是测试新拌混凝土塑性的简化措施,执行标准为ASTM C 143或EN 12350-2。...
点击蓝字 关注我们混凝土作为用途最为广泛的建筑材料,其质量与建筑物结构安全关系重大。各国在混凝土性能测试测定和评价方面都做了大量研究,并制定了相应的试验标准。美国标准ASTM C39《圆柱型混凝土试样抗压强度的标准试验方法》;欧洲标准EN 12390《硬化混凝土试验》系列标准。GB/T50081-2019《混凝土物理力学性能试验方法标准》是我国主要的混凝土力学性能测试方法。...
混凝土温度强度监测仪Giatec的SmartRock无线混凝土温度和强度传感器可以监测混凝土从新拌到硬化过程中的温度变化,也可根据成熟度的概念来预测混凝土的强度,以防止裂缝的发生。...
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