本文選題：再生骨料 + 吸水返水特性��； 參考：《混凝土》2017年12期

【摘要】：采用U型管微壓測定裝置,結(jié)合毛細(xì)管負(fù)壓測試,研究了不同預(yù)濕程度的再生廢磚骨料在不同水灰比凈漿中的吸水返水特性。研究結(jié)果表明,再生骨料接觸水泥漿體后開始吸水,隨著水泥水化反應(yīng)的進(jìn)行,水分不斷消耗,漿體毛細(xì)管不斷細(xì)化,孔內(nèi)負(fù)壓增大,骨料開始返水,當(dāng)毛細(xì)管負(fù)壓達(dá)到峰值后,骨料返水速度變慢,直至達(dá)到新的平衡時(shí)返水結(jié)束;再生骨料的吸水返水特性和骨料預(yù)濕程度及漿體水灰比相關(guān),骨料在預(yù)濕狀態(tài)及水灰比低的條件下,吸水能力較弱,返水能力較強(qiáng)。
[Abstract]:The water absorption and return characteristics of recycled brick aggregate with different prewetting degree in different water / cement ratio were studied by using U type tube micro pressure measuring device and capillary negative pressure test. The results show that the recycled aggregate begins to absorb water after contact with the cement paste. With the hydration reaction of cement, the water is consumed continuously, the slurry capillary is continuously refined, the negative pressure in the pore increases, and the aggregate begins to return water. When the capillary negative pressure reaches the peak value, the rate of water return becomes slower until the new equilibrium is reached, and the water absorption and water return characteristics of the recycled aggregate are related to the prewetting degree of the aggregate and the water-cement ratio of the slurry. Under the condition of prewet state and low water-cement ratio, the absorbability of aggregate is weak and the ability of water recovery is stronger.
【作者單位】： 北京建筑大學(xué)北京未來城市設(shè)計(jì)高精尖創(chuàng)新中心;
【基金】：國家自然科學(xué)基金(51608028);國家自然科學(xué)基金(51608029)
【分類號】：TU528.041
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本文編號：2111171