Study on Improving Performance of Concrete Subjected to Acid Rain and Deicers

提高酸雨和除冰剂混凝土性能的研究

• 批准号: 05660269
• 负责人: FUJII Takashi
• 金额: $ 1.34万
• 依托单位: Tokyo University of Agriculture and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05660269/
• 关键词: Acid rain; Deicer; Fiber-reinforcement; Ground granulated blast furnace slag; Cement composite; Calcium hydroxide leach; Coefficient of permeability; Freeze-thaw resistance; 炭素繊維; アラミド繊維; コンクリート; 融氷剤(路面凍結防止剤); 微小硬度

Cement composites incorporating ground granulated blast furnace slag, whch were reinforced with carbon fibers or aramid fibers, were investigated to develop material for protecting concrete surface. The cement composites were immersed in combined solutions of sulfuric acid and deicing chemicals such as NaCl and calcium magnesium acetate (CMA). The residual amounts of calcium hydroxide decreased with increasing in immersion period in the combined solutions. The lowest value in microhardness was observed on any specimen immersed in the mixed solution of acid and CMA.It is found that the combined action of the sulfuric acid and the deicer solution is more deleterious to the cement composite materials than the action of solely sulfuric acid solution. Permeability and freeze-thaw resistance of the cement composites were investigated against acid and deicer solutions. Coefficient of permeability was calculated on the basis of the measured weight of permeated solution by using a centrifuge. Freeze-thaw tests were performed for the specimens which were immersed in the specified solutions. The coefficient of permeability decreases with increasing in the slag replacement ratio and the freeze-thaw resistance increases, although the freeze-thaw resistance decreases in the case of the slag replacement ratio of 70%. Although the coefficient of permeability increases with increasing in the fiber volume fraction, the freeze-thaw resistance become remarkably higher.

研究了碳纤维和芳纶纤维增强矿渣水泥基复合材料的表面防护性能。将水泥复合材料浸入硫酸和除冰化学品如NaCl和醋酸钙镁（CMA）的组合溶液中。氢氧化钙的残留量随着浸泡时间的延长而减少。在酸和CMA混合溶液中浸泡的试样显微硬度最低，硫酸和除冰液的共同作用比单独硫酸溶液对水泥复合材料的危害更大。水泥复合材料的渗透性和抗冻融性进行了研究，对酸和除冰溶液。渗透系数是根据使用离心机测得的渗透溶液重量计算的。对浸泡在规定溶液中的样本进行冻融试验。渗透系数随着矿渣置换率的增加而减小，并且抗冻融性增加，尽管在矿渣置换率为70%的情况下抗冻融性降低。虽然渗透系数随着纤维体积分数的增加而增加，但其抗冻融性能也显著提高。

项目成果

藤井卓: "複合セメント硬化体の酸および融氷剤溶液に対する透水性と凍結融解抵抗性" セメント・コンクリート論文集. 50(発表予定). (1996)

Takashi Fujii：“硬化复合水泥对酸和除冰剂溶液的透水性和冻融性”《水泥和混凝土杂志》50（待发表）。

FUJII,T.: "Effect of Acid solution on Fiber-Reinforced Hardened Cement Pastes Incorporating Blast Furnace Slag." Japan Cement Association Proc.of Cement & Concrete. No.49. 686-691 (1995)

FUJII,T.：“酸溶液对掺有高炉矿渣的纤维增强硬化水泥浆的影响。”

Fujii, T.: "Combined Effect of Acid and Deicer Solutions on Fiber-Reinforced Hardened Cement Pastes" Proc. of Int'l Conf. On Concrete under Severe Conditions. 2. 1247-1256 (1995)

Fujii, T.：“酸和除冰剂溶液对纤维增强硬化水泥浆体的综合影响”Proc。

FUJII,T.: "Behavior of Fiber-Reinforced Hardened Cement Pastes Immersed in Acid Solutions." Proc.of the Japan Concrete Institute. Vol.16, No.1. 907-912 (1994)

FUJII,T.：“纤维增强硬化水泥浆体浸入酸溶液中的行为。”

藤井卓: "酸性溶液の作用をうける繊維補強セメント硬化体の挙動" コンクリート工学年次論文報告集. 16. 907-912 (1994)

Takashi Fujii：“硬化纤维增强水泥在酸性溶液作用下的行为”混凝土工程年报16. 907-912（1994）。