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一、前言为了满足桥梁混凝土的设计和施工的需要,我们对用外加剂配制泵送缓凝早强混凝土及中温蒸养混凝土进行了研究,取得了良好结果。现将这两种混凝土的研究结果分述如下:二、泵送缓凝早强混凝土的研究(一)泵送混凝土的技术要求及外加剂的选择泵送混凝土的技术要求:(1)采用425号普通水泥,水泥用量不超过500公斤/米~3;(2)集料采用中砂及5～20毫米碎
I. INTRODUCTION In order to meet the design and construction requirements of bridge concrete, we studied the use of admixtures to prepare pumped retarded early-strength concrete and intermediate-temperature steam-cured concrete, and achieved good results. The research results of these two kinds of concrete are divided into two parts as follows: Second, the study of pumping retarding early-strength concrete (I) Technical requirements for pumping concrete and the selection of additives The technical requirements for pumping concrete: (1) Adopt 425 No. Ordinary cement, the cement dosage should not exceed 500 kg/m~3; (2) The aggregate material should be medium sand and 5~20mm broken.