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

被引：35

作者：

Maruyama, I. ^{[1
]}

Kanematsu, M. ^{[1
]}

Noguchi, T. ^{[1
]}

Iikura, H. ^{[1
]}

Teramoto, A. ^{[1
]}

Hayano, H. ^{[1
]}

机构：

[1] Nagoya Univ, Grad Sch Environm Studies, Chikusa Ku, Nagoya, Aichi 4648601, Japan

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2009年 / 605卷 / 1-2期

关键词：

Neutron radiography; Water transfer; Lightweight aggregate; High-strength concrete; HIGH-STRENGTH CONCRETE; AUTOGENOUS SHRINKAGE;

D O I：

10.1016/j.nima.2009.01.138

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

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. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：159 / 162

页数：4

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