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    蘇州混凝土水泥制品研究院有限公司

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    發布時間:2020-01-06 00:00:00
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    超輕質混凝土的抗凍性試驗方法研究
    Test Method for Freeze-thaw Resistance of Ultra-lightweight Concrete
    2022年第6期
    輕質混凝土;抗凍性;含水率;融化溫度;試件尺寸;凍融循環
    Ultra-lightweight concrete; Freeze-thaw resistance; Moisture content; Thawing temperature; Size of specimen; Freeze-thaw cycle
    2022年第6期
    10.19761/j.1000-4637.2022.06.031.06
    國家重點研發計劃項目(2017YFB0309903);國家自然科學基金面上項目(51972295)。
    劉 迪,王 玲,王振地,方 俊
    中國建筑材料科學研究總院有限公司 綠色建筑材料國家重點實驗室,北京 100024

    劉 迪,王 玲,王振地,方 俊

    劉迪,王玲,王振地,等.超輕質混凝土的抗凍性試驗方法研究[J].混凝土與水泥制品,2022(6):31-36.

    LIU D,WANG L,WANG Z D,et al.Test Method for Freeze-thaw Resistance of Ultra-lightweight Concrete[J].China Concrete and Cement Products,2022(6):31-36.

    瀏覽量:
    1000
    針對現有方法評價超輕質混凝土的抗凍性存在烘干開裂、凍融失效過快等不足,提出了一種改進測試方法,即試件飽水后再瀝水,以調節含水率,并采用氣凍氣融進行凍融循環試驗。研究了瀝水時間、融化溫度和試件尺寸對超輕質混凝土強度損失率和質量損失率的影響。結果表明:控制瀝水時間能有效調節試件的含水率;隨著瀝水時間的延長,試件的凍融質量損失率和強度損失率大體呈下降趨勢;降低凍融循環試驗時的融化溫度能有效解決試件的開裂問題;尺寸較小試件對溫度的敏感程度相對較大,尺寸較大的試件凍融破壞嚴重,不易搬運。并在此研究基礎上,提出了適合超輕質混凝土抗凍性試驗的改進方法,確定了適宜的瀝水時間、融化溫度和試件尺寸,分別為6 h、15 ℃和100 mm×100 mm×100 mm,可為超輕質混凝土的抗凍性測試提供參考。 Aimed to solve the deficiencies of the domestic existing msethod for evaluating the freeze-thaw resistance of ultra-lightweight concrete(ULWC), such as cracking caused by drying and deterioration by freeze-thaw cycles too fast, a new method was put forward, in which the moisture content of the ULWC specimen was adjusted by controlling draining time after soaked in water, and then the mode of freezing and thawing cycle in air was used. The effects of test parameters such as draining time of specimen, thawing temperature and specimen size on the strength loss rate and mass loss rate of ULWC were studied. The results show that controlling the draining time can effectively adjust the moisture content of the specimen. Both the freeze-thaw mass loss rate and strength loss rate of the specimens generally show a downward trend with the extension of the draining time. Lowering the melting temperature can effectively solve the problem of cracking of ULWC specimen during the freeze-thaw test. The smaller size of the specimen is relatively more sensitive to temperature, and the larger size of the specimen is severely damaged by freezing and thawing, and is not easy to handle. Based on the research, a new test method suitable for the evaluation of freeze-thaw resistance of ULWC was proposed. The appropriate drain time, thawing temperature and specimen size were determined to be 6 h, 15 °C and 100 mm×100 mm×100 mm, respectively. The results can provide a reference for the frost resistance test of ULWC.
    英文名 : Test Method for Freeze-thaw Resistance of Ultra-lightweight Concrete
    刊期 : 2022年第6期
    關鍵詞 : 輕質混凝土;抗凍性;含水率;融化溫度;試件尺寸;凍融循環
    Key words : Ultra-lightweight concrete; Freeze-thaw resistance; Moisture content; Thawing temperature; Size of specimen; Freeze-thaw cycle
    刊期 : 2022年第6期
    DOI : 10.19761/j.1000-4637.2022.06.031.06
    文章編號 :
    基金項目 : 國家重點研發計劃項目(2017YFB0309903);國家自然科學基金面上項目(51972295)。
    作者 : 劉 迪,王 玲,王振地,方 俊
    單位 : 中國建筑材料科學研究總院有限公司 綠色建筑材料國家重點實驗室,北京 100024

    劉 迪,王 玲,王振地,方 俊

    劉迪,王玲,王振地,等.超輕質混凝土的抗凍性試驗方法研究[J].混凝土與水泥制品,2022(6):31-36.

    LIU D,WANG L,WANG Z D,et al.Test Method for Freeze-thaw Resistance of Ultra-lightweight Concrete[J].China Concrete and Cement Products,2022(6):31-36.

    摘要
    參數
    結論
    參考文獻
    引用本文

    針對現有方法評價超輕質混凝土的抗凍性存在烘干開裂、凍融失效過快等不足,提出了一種改進測試方法,即試件飽水后再瀝水,以調節含水率,并采用氣凍氣融進行凍融循環試驗。研究了瀝水時間、融化溫度和試件尺寸對超輕質混凝土強度損失率和質量損失率的影響。結果表明:控制瀝水時間能有效調節試件的含水率;隨著瀝水時間的延長,試件的凍融質量損失率和強度損失率大體呈下降趨勢;降低凍融循環試驗時的融化溫度能有效解決試件的開裂問題;尺寸較小試件對溫度的敏感程度相對較大,尺寸較大的試件凍融破壞嚴重,不易搬運。并在此研究基礎上,提出了適合超輕質混凝土抗凍性試驗的改進方法,確定了適宜的瀝水時間、融化溫度和試件尺寸,分別為6 h、15 ℃和100 mm×100 mm×100 mm,可為超輕質混凝土的抗凍性測試提供參考。

    Aimed to solve the deficiencies of the domestic existing msethod for evaluating the freeze-thaw resistance of ultra-lightweight concrete(ULWC), such as cracking caused by drying and deterioration by freeze-thaw cycles too fast, a new method was put forward, in which the moisture content of the ULWC specimen was adjusted by controlling draining time after soaked in water, and then the mode of freezing and thawing cycle in air was used. The effects of test parameters such as draining time of specimen, thawing temperature and specimen size on the strength loss rate and mass loss rate of ULWC were studied. The results show that controlling the draining time can effectively adjust the moisture content of the specimen. Both the freeze-thaw mass loss rate and strength loss rate of the specimens generally show a downward trend with the extension of the draining time. Lowering the melting temperature can effectively solve the problem of cracking of ULWC specimen during the freeze-thaw test. The smaller size of the specimen is relatively more sensitive to temperature, and the larger size of the specimen is severely damaged by freezing and thawing, and is not easy to handle. Based on the research, a new test method suitable for the evaluation of freeze-thaw resistance of ULWC was proposed. The appropriate drain time, thawing temperature and specimen size were determined to be 6 h, 15 °C and 100 mm×100 mm×100 mm, respectively. The results can provide a reference for the frost resistance test of ULWC.

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    (1)控制瀝水時間能有效調節試件的含水率,同一干密度的超輕質混凝土試件在相同凍融循環次數下,隨著瀝水時間的延長,其凍融質量損失率和抗壓強度損失率大體呈下降趨勢,瀝水6 h和12 h時,試件在凍融過程中質量損失的變化趨勢基本相同,考慮時間成本,選擇瀝水時間為6 h。
    (2)降低融化溫度能有效解決超輕質混凝土凍融過程中大規模開裂問題,但考慮到5 ℃條件下融化5 h仍有試件表面結冰未融化的現象,確定凍融循環試驗的融化溫度為15 ℃。
    (3)隨著試件尺寸的增大,超輕質混凝土試件凍融破壞程度越嚴重。小尺寸試件(邊長70 mm)對外界溫度變化更敏感,大尺寸試件(邊長150 mm)在凍融循環試驗過程不便搬運,易出現破損。綜合考慮,選擇邊長為100 mm的立方體試件進行試驗較為合理。

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    劉迪,王玲,王振地,.超輕質混凝土的抗凍性試驗方法研究[J].混凝土與水泥制品,2022(6):31-36.

    LIU D,WANG L,WANG Z D,et al.Test Method for Freeze-thaw Resistance of Ultra-lightweight Concrete[J].China Concrete and Cement Products,2022(6):31-36.

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