我们过去对混凝土的脱模强度是以养护时间来控制的,只是在冬夏变换养护制度时,才进行混凝土试块抽查。由于主客观多种因素的影响,产品的脱模强度往往得不到保证,电杆冻裂高达10％以上。以后,改用混凝土抗压强度来控制养护制度。产品在出养护池前,先试压混凝土试块,普通混凝土产品,强度要达到70％,预应力钢筋混凝土产 In the past, the demoulding strength of concrete was controlled by the maintenance time. Only when the maintenance system was changed in winter and summer, was the concrete block sampled. Due to the influence of various subjective and objective factors, the strength of the product’s mold release is often not guaranteed, and the electric pole freezes up to 10% or more. Later, the use of concrete compressive strength to control the maintenance system. Before the product is put out of the nursing pool, the concrete test block is tested first, and the ordinary concrete product has a strength of 70%. The prestressed concrete production