低碳超高强石渣混凝土的配制技术研究
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摘要
应用"硅酸盐水泥+活性矿物掺合料+高效减水剂"的技术路线、磁化水混凝土技术和常规的制备工艺,利用本地来源广泛的石子、石渣等原材料进行了低碳超高强石渣混凝土(GSHSCUS)试验,系统研究掺合料、养护制度、养护龄期等对超高强石渣混凝土强度的影响,探讨其规律性.试验结果表明,采用普通工艺、廉价的本地材料及低至350 kg·m~(-3)的水泥消耗量完全可以制备抗压强度达到128.8 MPa的低碳超高强混凝土.在试验参数范围内,绝湿养护、冷水养护对混凝土强度的影响并不十分明显;影响超高强石渣混凝土强度的因素依次为水胶比、硅粉掺量、水泥用量、偏高岭土掺量和粉煤灰掺量;超高强石渣混凝土的单位质量水泥贡献的质强比约为普通混凝土的4.17倍,约为高强混凝土(HSC)的2.49倍,活性粉末混凝土(RPC)的2.02倍.因此,以低用量水泥配制的超高强石渣混凝土是低碳绿色混凝土,是低碳经济时代混凝土发展的方向.
Adopting the technique of Portland cement mixed active mineral admixtures with superplasticizer, and the magnetized water concrete plus general technical process,the authors have conducted experiments on green super high strength concrete by using local raw materials such as gravel,stone-chip instead of sand.Through experiments,the influence of additives,curing condition,curing age on the strength is systematically studied.Experimental results show that,it is possible for us to make up the new type of environmentally friendly concrete,i.e.,super-high strength concrete,with the strength being as high as 128.8 MPa by means of the general technical process with the cheap local materials,and at the lower consumption of ordinary Portland cement of 350 kg·m~(-3).It was found that within the factor scope of this test,water curing of concrete is nearly the same as that of water-proof curing of concrete on the strength; the related factors affecting compressive strength of GSHSCUS,in a sequence of contribution,are the ratio of water to binder,silica content,cement content,metakaolin content,and the fly ash content respectively, and that specific strength of per unit cement of GSHSCUS is about 4.17 times as high as that of ordinary concrete,and 2.49 times that of HSC,and 2.02 times that of RPC.Therefore,GSHSCUS at the lower consumption of cement can be called as low-carbon concrete and sure to be paid much attention on in the coming low-carbon era.
Adopting the technique of Portland cement mixed active mineral admixtures with superplasticizer, and the magnetized water concrete plus general technical process,the authors have conducted experiments on green super high strength concrete by using local raw materials such as gravel,stone-chip instead of sand.Through experiments,the influence of additives,curing condition,curing age on the strength is systematically studied.Experimental results show that,it is possible for us to make up the new type of environmentally friendly concrete,i.e.,super-high strength concrete,with the strength being as high as 128.8 MPa by means of the general technical process with the cheap local materials,and at the lower consumption of ordinary Portland cement of 350 kg·m~(-3).It was found that within the factor scope of this test,water curing of concrete is nearly the same as that of water-proof curing of concrete on the strength; the related factors affecting compressive strength of GSHSCUS,in a sequence of contribution,are the ratio of water to binder,silica content,cement content,metakaolin content,and the fly ash content respectively, and that specific strength of per unit cement of GSHSCUS is about 4.17 times as high as that of ordinary concrete,and 2.49 times that of HSC,and 2.02 times that of RPC.Therefore,GSHSCUS at the lower consumption of cement can be called as low-carbon concrete and sure to be paid much attention on in the coming low-carbon era.
引文
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[3]陈国灿.钢管聚丙烯纤维超高强石渣混凝土短柱的静力特性研究[J].武汉大学学报工学版,2010(5):617-622.
[4]田志敏,张想柏,冯建文,等.钢管超高性能RPC短柱的轴压特性研究[J].地震工程与工程振动,2008(1):99-107.
[5]冯乃谦.高性能混凝土与超高性能混凝土的发展和应用[J].施工技术,2009(4):1-6.
[6]陈国灿.低碳超高强石渣混凝土的力学性能试验研究[J].佳木斯大学学报自然科学版,2010(5):693-697.
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[8]邓聚龙.灰色预测与决策[M].武汉:华中科技大学出版社,2002.
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