利用废弃混凝土粉料制备粘结砂浆的研究
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摘要
为解决建筑垃圾成分复杂、粉料造成二次污染的问题,根据废弃混凝土粉料具有一定活性且多孔的特点,研究了废弃混凝土粉料掺量对陶瓷面砖粘结剂工作性和力学性能的影响规律。结果表明:多孔的建筑垃圾细粉料会导致瓷砖粘结剂砂浆的需水量增加、保水能力增强、凝结时间缩短,废弃混凝土微粉的优化掺量区间为外掺10%。采用XRD、SEM等测试技术从微观上揭示建筑垃圾微粉的掺入对力学性能的影响机理是:在低掺量条件下,多孔的建筑垃圾微粉在拌合初期孔洞吸水,形成局部低水胶比区,同时在水化过程中释放水分,促进了粉料周围水泥水化;高掺量时建筑垃圾微粉活性显著低于水泥的活性,降低粘结剂砂浆的总体强度。
In order to solve the problem of construction waste composition,powder cause secondary pollution,according to the waste concrete powder with a certain activity and the porous characteristics of the waste concrete powder content on the workability and mechanical properties of ceramic tile adhesives;the results showed that: the porous powder materials of construction waste will lead to the increase in water demand of the tile adhesive mortar and water retention ability,setting time shorten the optimal dosage range of waste concrete powder mixed with 10%,adopted by XRD,SEM such as testing technology construction waste powder mixed with mechanical properties of the mechanism is derived from the micro level: low dosage conditions,porous construction waste powder in mixing early holes absorbent,the formation of local low water-cement ratio the district,while the release of water in the hydration process,the powder around the cement hydration;construction waste powder activity was significantly lower than the activity of the cement at high dosage,reducing the overall strength of the binder mortar.The research results to improve the construction waste resource utilization efficiency and reduce the cost of ceramic tile binder of great significance.
In order to solve the problem of construction waste composition,powder cause secondary pollution,according to the waste concrete powder with a certain activity and the porous characteristics of the waste concrete powder content on the workability and mechanical properties of ceramic tile adhesives;the results showed that: the porous powder materials of construction waste will lead to the increase in water demand of the tile adhesive mortar and water retention ability,setting time shorten the optimal dosage range of waste concrete powder mixed with 10%,adopted by XRD,SEM such as testing technology construction waste powder mixed with mechanical properties of the mechanism is derived from the micro level: low dosage conditions,porous construction waste powder in mixing early holes absorbent,the formation of local low water-cement ratio the district,while the release of water in the hydration process,the powder around the cement hydration;construction waste powder activity was significantly lower than the activity of the cement at high dosage,reducing the overall strength of the binder mortar.The research results to improve the construction waste resource utilization efficiency and reduce the cost of ceramic tile binder of great significance.
引文
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[2]宋少民,王林.建筑垃圾再生混凝土配合比试验研究[J].武汉理工大学学报,2009,31(7):56-59.
[3]袁远.机械力化学改性粉状建筑废弃物的研究[D].昆明:昆明理工大学,2009.
[4]阎培渝.建筑垃圾资源化关键技术与产业化[J].建设科技,2007,10(5):10-15.
[5]陈刚,苏磊,陈扬.国外建筑垃圾再生骨料的应用情况及在国内市场的应用前景分析[J].中国环保产业,2005,28(7):51-53.
[6]李滢,代大虎.建筑垃圾再生骨料基本特性研究[J].青海大学学报:自然科学版,2011,12(3):14-17.
[7]张益,王雷.《地震灾区建筑垃圾处理技术导则》解析[J].建设科技,2008,27(15):68-70.
[8]欧阳雯欣,王清远.灾后再生混凝土的应用及推广分析[J].四川建筑科学研究,2010,36(6):178-184.
[9]陈军,何品晶,邵立明,等.拆毁建筑垃圾产生量的估算方法探讨[J].环境卫生工程,2007,14(6):20-22.
[10]吴贤国,李惠强,杜婷.建筑施工废料的数量、组成与产生原因分析[J].华中科技大学学报,2000,36(12):47-50.
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