A Study on Hot Weather Concrete in High Temperature Ambience

高温环境下高温混凝土的研究

• 批准号: 01550444
• 负责人: OHKUBO Takaaki
• 金额: $ 1.41万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550444/
• 关键词: Hot Weather; Hot Weather Concrete; Ambient Temperature; Humidity; Temperature Distribution; Vaporized Water; Hydration Heat; Heat Loss due to Vaporization; 養生; コンクリ-ト

In order to establish an acceptable quality standard of the hot weather concrete, it is essential that such problems are at first analyzed and evaluated and then the sources of the respective problems are identified.In this study, the crack occurrence in the early time in the concrete placed in a hot weather environment was discussed from the viewpoint of the temperature distribution in the specimens.For the experiments, mortar specimens were prepared under various environmental conditions, being subjected to regular measurement of their internally distributed temperatures for 24 hours in order to exhibit how the both ambient air temperature over the period and end-of-mixing temperature of mortar specimen affect such internal temperature distribution. This was designed to allow us to quantitatively evaluate ambient temperature effects on crack occurrence, reflecting the fact that the hot weather concrete intrinsically relates to high ambient temperatures. Through a series of experiments it was brought to light that the relation between the ambient and end-of-mixing temperatures, heat gain due to hydration and heat loss due to vaporization significantly affected the temperature distribution in the specimens.

为了建立一个可接受的高温混凝土质量标准，首先要对这些问题进行分析和评价，然后找出问题的根源。本研究从试件温度分布的角度讨论了高温环境下混凝土早期裂缝的发生。在试验中，制备了不同环境条件下的砂浆试件，并对其内部温度进行了24小时的定期测量，以揭示环境温度和砂浆试件的拌和结束温度对混凝土内部温度分布的影响。这是为了让我们能够定量地评估环境温度对裂缝发生的影响，反映出高温混凝土本质上与环境温度高有关的事实。通过一系列实验发现，环境温度和混合结束温度、水化热增量和汽化热损失之间的关系对样品中的温度分布有显著影响。

项目成果

Matsufuji yasunori et al: "A study on estimating method of fresh concrete temperature mixed and agitated in hot weather ambience" Summaries of Technical Papers of Annual Meeting, Architectural Institute of Japan. (1990)

Matsufuji yasunori等人：“炎热天气环境下混合搅拌新拌混凝土温度估算方法的研究”日本建筑学会年会技术论文摘要。

松藤 泰典: "An Experimental Study on Temperature Distribution inside Mortar Specimens Placed in High Tomperature Ambience" 日本建築学会構造系論文報告集. No.422. (1991)

Yasunori Matsufuji：“高温环境下砂浆样本内部温度分布的实验研究”日本建筑研究所结构科学论文报告第 422 号。（1991 年）

松藤 泰典: "暑中環境下で打設されるコンクリ-トの初期ひびわれに関する研究 (その2)外気温が変動しない場合(温度分布に関する解析)" 日本建築学会大会学術講演梗概集. A. 277-278 (1990)

松藤康典：“室外温度不波动时，在炎热的夏季环境中放置的混凝土的初始开裂的研究（第2部分）（温度分布分析）”日本建筑学会会议学术讲座摘要A.277。 - 278 (1990)

Matsufuji yasunori et al: "A study on estimating method of fresh concrete temperature mixed and agitated in hot weather ambience" Technical report of AIJ Kyushu branch. 8-1. (1991)

松藤康典等人：《炎热天气环境下新拌混凝土温度估算方法的研究》AIJ九州分会技术报告。

松藤 泰典: "暑中環境下で打設されるコンクリ-トの初期ひびわれに関する研究 (その1)外気温が変動しない場合(温度分布に関する実験)" 日本建築学会大会学術講演梗概集. A. 275-276 (1990)

松藤康典：“在炎热的夏季环境中放置的混凝土的初始开裂的研究（第1部分）当外界温度不波动时（温度分布实验）”日本建筑学会会议学术讲座摘要A.275。 - 276 (1990)