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Experimental Shrinkage Testing on Concrete Masonry Units and Walls with Different Curing Conditions

机译：不同养护条件下混凝土砌块和墙体的收缩试验

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This paper reports on an experimental program for measuring shrinkage of concrete masonry units and walls. Tests were carried out on blocks of 4.5, 8.0 and 14.0N/mm~2 strengths (with respect to gross area); different suppliers and curing procedures including air curing and moist or steam curing were investigated. The shrinkage tests on the blocks were carried out as recommended in ASTM C426, using the whole block as the specimen and with gauge measuring points (discs) attached to its sides. Three variations of this configuration were also tested: a face-shell prism cut from a whole block with gauge discs attached to the sides, the same specimen with gauge discs attached to the top and bottom and whole blocks with gauge discs attached to the top and bottom. For the case of gauge discs attached to the sides, a Humboldt strain gauge was used to measure deformation. In the case of the gauge discs being attached to the top and bottom, a comparator gauge was used. Small walls, 120 to 100cm, were built inside the laboratory were gauge discs were attached at several points. The deformations between vertical and horizontal lines were measured for at least one year. Also, deformation on control blocks left inside the laboratory in front of each wall, submitted to the same environmental conditions of the wall, were also controlled. The results of the concrete block shrinkage tests were hardly influenced by the type of initial three-day cure, although different shrinkage values were observed in the control blocks for each cure type. Regarding the test procedures, only small differences in the results were obtained with whole blocks or the face shell-prisms, when readings were taken on the sides of the specimen. The use of whole blocks with gauge discs on the top and bottom was shown to be inadequate. However, it may be possible to use top and bottom gauge discs on face-shell prisms, but more investigation into this test procedure is needed to improve results. The influence of initial cure on the wall specimens was noted in that the total shrinkage was nearly equal to that measured on control blocks. The total shrinkage measured after one year is reported for each wall.
机译：本文报告了一个测量混凝土砌体单元和墙壁收缩率的实验程序。在4.5、8.0和14.0N / mm〜2强度（相对于总面积）的块上进行测试；研究了不同的供应商和固化程序，包括空气固化和湿法或蒸汽固化。按照ASTM C426的建议，对块体进行收缩测试，使用整个块体作为样品，并在其侧面连接量规测量点（圆盘）。还测试了此配置的三个变体：从整块切割而成的面壳棱镜，在其侧面上装有量规盘，同一样品在其顶部和底部都装有量规盘，而整个标本都在其顶部和底部装有量规盘。底部。对于安装在侧面的量规盘，使用洪堡应变仪测量变形。如果量规盘安装在顶部和底部，则使用比较器量规。实验室内部建有120至100厘米的小墙，量规盘固定在几个点上。测量垂直线和水平线之间的变形至少一年。同样，还可以控制实验室内部留在每堵墙前面的控制块的变形，使其经受与墙相同的环境条件。混凝土块收缩测试的结果几乎不受初始三天固化类型的影响，尽管每种固化类型在对照块中观察到不同的收缩值。关于测试程序，当在试样侧面进行读数时，使用整块或面壳棱镜只能得到很小的结果差异。结果表明，使用顶部和底部带有量规盘的整体块是不合适的。但是，可以在面壳棱镜上使用顶部和底部标度盘，但是需要对该测试过程进行更多研究以改善结果。注意到初始固化对墙样品的影响，因为总收缩率几乎与对照块上的收缩率相等。记录一年后每堵墙的总收缩率。

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