產品介紹
(1)水泥,冬期施工中應優先選用硅酸鹽水泥或普通硅酸鹽水泥,水泥強度等級不低于
級。小的水泥用量不應少于300kg/m,水灰比不應大于 。使用其他品種水泥時,
應注意其中摻合料對隧道溝蓋板混凝土抗凍、抗滲等性能的影響。摻防凍劑的混凝土,嚴
禁使用高鋁水泥。
) Cement, Portland cement or ordinary portland cement shall be preferred in
winter construction, and the cement strength grade shall not be lower than
. The minimum cement consumption shall not be less than 300kg / m, and the
water cement ratio shall not be greater than . When using other kinds of
cement, attention should be paid to the influence of admixtures on the frost
resistance and impermeability of tunnel trench cover concrete. High alumina
cement shall not be used for concrete mixed with antifreeze.
(2)隧道溝蓋板模具混凝土骨料。冬期施工中,隧道溝蓋板混凝土骨料清潔,不得含
有冰、雪等凍結物及易凍裂的礦物質。在摻有鉀、鈉離子防凍劑的混凝土中,骨料中不應
混有活性骨料。