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論文

Evaluation of water transfer from saturated lightweight aggregate to cement paste matrix by neutron radiography

丸山 一平*; 兼松 学*; 野口 貴文*; 飯倉 寛; 寺本 篤史*; 早野 博幸*

Nuclear Instruments and Methods in Physics Research A, 605(1-2), p.159 - 162, 2009/06

 被引用回数:30 パーセンタイル:88.62(Instruments & Instrumentation)

In high-strength concrete with low water-cement ratio, self-desiccation occurs due to cement hydration and causes shrinkage and an increased risk of cracking. While high-strength concrete has a denser matrix than normal-strength concrete, resulting in lower permeability, early-age cracks would cancel out this advantage. For the mitigation of this self-desiccation and resultant shrinkage, water saturated porous aggregate, such as artificial lightweight aggregate, may be used in high-strength concrete. In this contribution, for the purpose of clarification of the volume change of high-strength concrete containing water-saturated lightweight aggregate, water transfer from the lightweight aggregate to cement paste matrix is visualized by neutron radiography. As a result, it is clear that water was supplied to the cement paste matrix in the range 3-8 mm from the surface of the aggregate, and the osmotic forces may yield water transfer around lightweight aggregate in a few hours after mixing.

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