前言贫混凝土(LEAN CONCRETE)是粗、细级配集料与有限的水泥用量和水的混合料。这种混合料的水泥含量较普通水泥混凝土低,通常水泥用量为集料干重的4％～7％之间,所以也称之为经济混凝土。对贫混凝土只期求具有较低的力学强度,其28天龄期的抗压强度一般选定为5.2～8.4MPa,抗折强度一般选定为1～1.8MPa。其强度之所以不要求那么高,主要是贫混凝土基层是无接缝的,所以要严格控制 Foreword LEAN CONCRETE is a mixture of coarse and fine graded aggregates with a limited amount of cement and water. This mixture of cement content lower than ordinary cement, usually the amount of cement aggregate dry weight of 4% to 7%, so it is also called economic concrete. For lean concrete, it only needs to have lower mechanical strength for a period of time. Its compressive strength at 28 days is generally selected to be 5.2 ~ 8.4MPa, and its flexural strength is generally selected as 1 ~ 1.8MPa. The reason why the strength is not so high, mainly lean concrete base is seamless, so to be strictly controlled