摘 要:通过实验研究探索了再生混凝土配合比设计的方法, 提出了在普通混凝土配合比设计的基础上进行废混凝土骨料的预吸水, 并通过掺加优质粉煤灰、减水剂或二者复合, 可成功地配制同时满足工作性和强度要求的再生混凝土。 根据这种方法 , 配制的全部使用废混凝土骨料为粗骨料的再生混凝土28天的抗压强度高达54.6MPa。 Abstract: The approach for the proportion design of recycled aggregate concrete is investigated according to the experimental study.It is suggested that the proportion of cement, sand and aggregate can be calculated based on the current proportion design code for ordinary concrete.As regard to the water content, the water adsorption of waste concrete aggregate within certain time period should also be considered and added to the water content calculated according to the code for ordinary concrete .In addition, the using of good quality fly ash and superplasticizer can improve the strength of recycled aggregate concrete.The highest compressive strength of the concrete, in which all aggregate is insteaded by waste concrete aggregate, is up to 54.6MPa at 28days.

摘 要:通过实验研究探索了再生混凝土配合比设计的方法, 提出了在普通混凝土配合比设计的基础上进行废混凝土骨料的预吸水, 并通过掺加优质粉煤灰、减水剂或二者复合, 可成功地配制同时满足工作性和强度要求的再生混凝土。 根据这种方法 , 配制的全部使用废混凝土骨料为粗骨料的再生混凝土28天的抗压强度高达54.6MPa。 Abstract: The approach for the proportion design of recycled aggregate concrete is investigated according to the experimental study.It is suggested that the proportion of cement, sand and aggregate can be calculated based on the current proportion design code for ordinary concrete.As regard to the water content, the water adsorption of waste concrete aggregate within certain time period should also be considered and added to the water content calculated according to the code for ordinary concrete .In addition, the using of good quality fly ash and superplasticizer can improve the strength of recycled aggregate concrete.The highest compressive strength of the concrete, in which all aggregate is insteaded by waste concrete aggregate, is up to 54.6MPa at 28days.

提要：21世纪水泥混凝土面临两大问题:(1)可持续发展问题;(2)可知性问题。本文以前者为主并论述高性能混凝土技术的要点。

摘要:本文从合理利用资源,保护人类赖于生存的自然环境不遭破坏并实现可持续发展的战略高度出发,论述了混凝土目前及今后的发展方向,提出了发展“绿色高性能混凝土(GHPC)的观点。 Abstract :In this paper the trend of concrete development at present and future has been espounded with a far -sighted strategy , that is reasonably utilizing the resource , protecting the natural environment , which human existance relies on , and realizing the sustainable development .And a point of view for developing Green High Performance Concrete has been put forward .

摘 要:试验研究了原材料品种、 性质及配合比对 RPC 强度的影响;在未掺钢纤维的情况下, 配制出了流动性好, 高温养护(200℃)下抗压强度达 229.0MPa 的超高强混凝土, 在掺钢纤维以及高温养护的情况下 RPC 的抗压强度高达 298.6MPa。 Abstract:ased on experiments , the effects of kinds , properties and proportioning of raw materials on the compressive strength of RPC was studied.As a result, ultra high-strength concrete with excellent fluidity and compressive strength up to 229.0MPa under high temperature curing (200℃)was prepared , while the compressive strength of RPC adding with steel fiber was up to 298.6MPa.

一 、大宗建材必须是可持续发展的绿色材料 水泥与水泥基材料是当今最大宗的人造材料 。世 界水泥年产量已超过 15 亿吨 (我国 1997 年为 5.1 亿 吨 ,达世界产量的三分之一), 据此推算 ,水泥基材料总 量在 60～ 70 亿吨上下 。估计所消耗的主要资源为优质 石灰石 15亿吨 、砂石集料 40 亿 m 3 , 排放的 CO 2(主要 温室气体)12亿吨以上 , 还有其他有害气体与大量粉 尘 ,严重污染环境 。如今后几年我国水泥年产量保持在 5亿吨 , 按合理的指标估算 , 每年消耗的能源 、资源与 造成的环境负担如表 1。 可见不论全世界与我国 ,都必须依靠科技 ,大力节 约能源资料 ,保护环境 ,否则水泥与水泥基材料将成为 不可持续发展的材料 。水泥基材料必须向高性能发展 , 向减少用量 , 延长寿命 , 增加功能 , 尤其降低环境代价 的方向努力 。

摘要 : 本文探讨了 橡胶粉对 混授土 抗折 、 抗压 强 度及抗冲击性 能的影响 。 研 究结 果表明橡胶 粉改性 混 凝土的抗折 、 抗压 强 度 较基准混 凝土 变化不 大 , 冲击荷载则 明 显提 高 。 采用 适当 粘结剂可 以 改善橡胶粉与混 授 土的界面状况 , 大幅度提高混凝土 的抗 冲击性能 。 Abstract: In this paper, the influence of rubber powder on flexural, compr回sive and impact strength of c。ncrete has been studied. The r田ults show that, in comparison with the control, there is lttle diifference to flexural and com pressive strength of the modifiied c。ncrete. H。wever, the impact property w出improved 。bviosly. Further more by using suitable adhesion agent, the interface state between rubber and conorete oan be improved, which greatly benefits the impact property of concrete.