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首页> 外文会议>SP-228; International Symposium on Utilization of High-Strength/High-Performance Concrete vol.1; 20050620-24; Washington,DC(US) >Very High-Strength Rapid-Hardening Concrete
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Very High-Strength Rapid-Hardening Concrete

机译：超高强度快速硬化混凝土

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Mix design and technology of very high strength rapid-hardening concrete (VHSC) on the base of composite cements produced by « intergrinding » (IG) and « interblending » (IB) have been developed, and their characteristic properties have been studied. The use of mechanical-chemical activation of binders in combination with both new generation superplasticizers based on polycarboxilates and traditional ones and efficient dispersed fine mineral additives (silica fume, metakaoline, etc) allows to obtain VHSC. The strength ranged from 50-80 MPa after 24 hours and 125-140 MPa after 28 days of normal curing for self-leveling concrete mixtures (slump value 22-25 cm). Intensive concrete hardening starts after either 10 hours (IG) or 15 hours (IB) from mixing time. With the increase of hardening temperature ranging from 40 to 50℃, the induction period decreases by 2-2,5 times, and strength of concrete exceeds 50 MPa in 8-10 hours after mixing (IG and IB, respectively). Volumetric water absorption of coarse aggregate concrete produced with water/binder ratio of 0.24-0.28 amounts to 2.2-3.3%, and that of fine-grained concrete, with water/ binder ratio of 0.32-0.39, to 3-3.4%. Waterproofness of such concrete exceeds W20 (water tightness relating to Russian standard testing of cube specimen 150 mm in diameter and 50 mm in height under 2 MPa pressure during 6 hours), and their freezing-thawing resistance surpasses 600 cycles. Physical and mechanical properties (initial modulus of elasticity, tensile strength) are in line with the normal indices for corresponding concrete classes. Shrinking deformations of heavy weight concrete after 28 days of normal curing are 10 x 10~(-2) - 17 x 10~(-2) mm/m and those of fine-grained concrete are 29 x 10~(-2) - 48 x 10~(-2) mm/m.
机译：已经开发了以“共磨”（IG）和“共混”（IB）生产的复合水泥为基础的超高强度快速硬化混凝土（VHSC）的配合料设计和技术，并研究了其特性。将粘合剂的机械化学活化方法与基于聚羧酸盐的新一代高效减水剂和传统的高效减水剂以及有效分散的细矿物质添加剂（硅粉，间苯二酚等）结合使用，可以得到VHSC。对于自流平混凝土混合物（坍落度值22-25厘米），强度在24小时后为50-80 MPa，在常规固化28天后为125-140 MPa。距搅拌时间10个小时（IG）或15个小时（IB）之后，开始进行混凝土强强化。随着硬化温度的升高，温度从40升高到50℃，诱导期缩短了2-2,5倍，并且混凝土强度在混合后的8-10小时内分别超过了50 MPa（分别为IG和IB）。水/粘合剂比为0.24-0.28的粗骨料混凝土的体积吸水率为2.2-3.3％，而水/粘合剂比为0.32-0.39的细粒混凝土的体积吸水率为3-3.4％。此类混凝土的防水性超过W20（与俄罗斯标准试验有关的立方体样品的直径为150 mm，高度为50 mm，在2 MPa压力下历时6小时的水密性），其耐冻融性超过600个循环。物理和机械性能（初始弹性模量，拉伸强度）与相应混凝土类别的标准指标一致。正常养护28天后，重混凝土的收缩变形为10 x 10〜（-2）-17 x 10〜（-2）mm / m，细粒混凝土的收缩变形为29 x 10〜（-2）- 48 x 10〜（-2）毫米/米

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