东江双曲拱坝坝高157m,混凝土方量为94万m~3。由于坝体较高且受力复杂,因此,对混凝土的抗裂性,耐久性和均匀性等方面都有较高的要求。但是,由于东江坝址区气温变幅大,夏季干燥,风速大,混凝土容易出现温度裂缝;拱坝混凝土采用的天然粗骨料虽能满足规范要求,但其风化、软弱颗粒含量较大,易破碎;砂子偏粗,且级配不均匀,所以 The dam of the Dongjiang double-curvature arch dam is 157m high with a concrete mass of 940,000m 3. Due to the high dam strength and complex, therefore, the crack resistance, durability and uniformity of concrete have higher requirements. However, due to the large temperature variation in the Dongjiang dam site, the summer dryness and wind speed, the concrete is prone to temperature cracks. Although the natural aggregate used in concrete arch dam can meet the requirements of the specification, its weathering and weak particles are relatively large, Broken; coarse sand partial, and grading uneven, so