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灌浆料裂缝情况分析

发布时间:2021-01-23 10:43      浏览次数:


温度裂缝多发生在灌浆料表面或温差变化较大地区的结构中。灌浆料浇筑后,在硬化过程中,灌浆料水化产生大量的水化热,导致内部温度急剧上升,而灌浆料表面散热较快,就形成内外的较大温差,较大的温差造成内部与外部热胀冷缩的程度不同,使混凝土表面产生一定的拉应力,当拉应力超过混凝土的抗拉强度极限时,灌浆料表面就会产生裂缝,这种裂缝多发生在混凝土施工中后期。温度裂缝的走向通常无一定规律,大面积结构裂缝常纵横交错;梁板类长度尺寸较大的结构,裂缝多平行于短边;深入和贯穿性的温度裂缝一般与短边方向平行或接近平行,裂缝沿着长边分段出现,中间较密。裂缝宽度大小不一,受温度变化影响较为明显,冬季较宽,夏季较窄。高温膨胀引起的灌浆料温度裂缝是通常中间粗两端细,而冷缩裂缝的粗细变化不太明显。此类缝隙较窄,不会影响结构受力。

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