Modeling of early age behavior of blast furnace slag concrete based on micro-physical properties
Modeling of early age behavior of blast furnace slag concrete based on micro-physical properties
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DOI：
10.1016/j.cemconres.2011.06.005
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发表时间：
2011-12
影响因子：
11.4
通讯作者：
T. Ishida;Y. Luan;T. Sagawa;T. Nawa
中科院分区：
文献类型：
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作者：
T. Ishida;Y. Luan;T. Sagawa;T. Nawa
增强了名为 DuCOM 的多尺度系统来模拟高炉矿渣 (BFS) 混凝土的行为。对BFS混凝土和硅酸盐水泥混凝土的强度和微湿物理性能进行了测试。目前的模型被发现低估了 BFS 混凝土后期的强度，因为低估了 C-S-H 凝胶孔内的含水量。为了解决这个问题，提出了增强的孔隙率建模，可以正确模拟 BFS 糊剂基质的孔隙率，并在后期发展出更高的强度。此外，基于增强的孔隙率模型，研究了BFS糊料基质的水分损失和孔径分布。发现模型中后期的孔径分布比测试更粗糙，导致水分损失的估计过高。因此，孔径分布也得到增强，从而可以模拟 BFS 基质的更精细的孔隙结构。最后，验证表明，增强模型可以更好地预测水解吸、水分损失和干燥收缩行为。
A multi-scale system called DuCOM was enhanced to model behaviors of blast furnace slag (BFS) concrete. Tests on the strength and micro–hygro–physical properties of BFS concrete and Portland cement concrete were conducted. The current model was found to underestimate the strength of BFS concrete at later ages owing to underestimation of the water content inside C–S–H gel pores. To remedy this, enhanced modeling of porosity allowing proper simulation of the porosity of the BFS paste matrix and higher strength development at later ages is proposed. Furthermore, based on the enhanced porosity model, the moisture loss and pore size distribution of the BFS paste matrix were investigated. The pore size distribution was found to be coarser than the test at later ages in the model, resulting in overestimation of moisture loss. Hence, the pore size distribution was enhanced as well, allowing simulation of a finer pore structure of the BFS matrix. Finally, verifications showed that the enhanced model better predicts water desorption, moisture loss and drying shrinkage behaviors.