建筑垃圾再生骨料干粉砂浆的制备和性能研究

发布时间：2018-01-02 16:35

本文关键词：建筑垃圾再生骨料干粉砂浆的制备和性能研究　出处：《济南大学》2014年硕士论文　论文类型：学位论文

【摘要】：我国是处于城市化全面发展的阶段，每年我国因为旧房拆迁及建造新房而产生大量的建筑垃圾，大部分垃圾都是直接堆放在露天或只是简单的填埋处理，对生态环境造成了严重破坏，建筑垃圾的再生资源化利用愈加紧迫。中国干粉砂浆的发展现状与发达国家相比差距较大，没有形成系统的基本机理理论研究，且有些砂浆配比的基本规律也未摸清。本文综合考虑建筑垃圾资源化的重要性和干粉砂浆取代现场拌制砂浆的必要性两方面的问题，利用建筑垃圾再生骨料生产干粉砂浆。本文主要研究内容包括：比较了再生骨料与天然河砂的基本物理性能，包括表观密度、孔隙率和吸水率等。以复合激发剂和界面增强剂对建筑垃圾再生骨料干粉砂浆进行改性，系统研究了复合激发剂和界面增强剂对干粉砂浆力学性能和砂浆界面结合情况的影响。研究了粉煤灰、羧甲基纤维素保水剂、萘系高效减水剂等对再生骨料干粉砌筑砂浆各项性能的影响和作用机理；研究了钢渣、硅灰、保水剂和减水剂等对再生骨料干粉抹灰砂浆性能的影响及作用机理；研究了粉煤灰、硅灰、保水剂和减水剂等对再生骨料干粉地面砂浆各项性能的影响和作用机理。实验研究表明，再生骨料的表观密度远小于天然河砂，孔隙率和吸水率比天然河砂大，再生骨料干粉砂浆的力学性能优于天然河砂干粉砂浆。复合激发剂可激发再生骨料中具有潜在胶凝活性的组分，同时可激发粉煤灰的活性，提高干粉砂浆的力学性能，比未掺加复合激发剂时28d抗压强度提高了5.93%。界面增强剂中的极性基团抑制游离水的扩散，改善界面层的结合情况，提高干粉砂浆的力学性能，比未掺加界面增强剂时28d抗压强度提高了8.71%。M10再生骨料干粉砌筑砂浆的最佳原料配比选择为：灰料比为1:5.0，粉煤灰掺量为25%，复合激发剂掺量为0.9%，界面增强剂掺量为1.2%，保水剂掺量为0.24%，减水剂掺量为1.2%，满足GB/T25181-2010《预拌砂浆》中对M10干粉砌筑砂浆各项性能的要求。加入羧甲基纤维素保水剂后，再生骨料干粉抹灰砂浆的收缩性能得到明显改善，在保水剂掺量为0.12%时，28d收缩率为1.56‰。M15再生骨料干粉抹灰砂浆的最佳原料配比选择为：灰料比1:4.0，钢渣掺量为18%，，硅灰掺量为4%，钢渣激发剂掺量为0.5%，复合激发剂0.9%，界面增强剂1.2%，保水剂0.15%，减水剂为1.5%，满足GB/T25181-2010《预拌砂浆》中对M15干粉抹灰砂浆各项性能的要求。再生骨料干粉地面砂浆在掺入萘系高效减水剂时，抗冻性能得到了一定程度的改善，减水剂掺量为1.2%时，再生骨料干粉地面砂浆的抗冻标号为D35，试样经35次冻融循环后，其质量损失为2.45%，强度损失为17.37%。M20再生骨料干粉地面砂浆的最佳原料配比选择为：灰料比为1:4.5，粉煤灰掺量为25%，硅灰掺量为4%，复合激发剂掺量为0.9%，界面增强剂掺量为1.2%，保水剂掺量为0.12%，减水剂掺量为1.2%，满足GB/T25181-2010《预拌砂浆》中对M20干粉地面砂浆各项性能的要求。
[Abstract]:Our country is in the stage of comprehensive development of the city, every year in China because the demolition of old and new buildings and produce large amounts of construction waste, most of the garbage are piled up in the open air or just simple landfill disposal, causing serious damage to the ecological environment, renewable resources construction waste utilization is even more pressing. The current situation of the development of Chinese powder of the large gap compared with developed countries, there is no theoretical research on the basic mechanism of the system, and some basic rules did not find out the mortar ratio. In this paper, considering the importance of construction waste recycling and dry mortar to replace the two necessary on-site mixing mortar of recycled aggregate mortar production, utilization of construction waste.
The main contents of this paper include: the basic physical properties between recycled aggregate and natural sand, including apparent density, porosity and water absorption rate. The compound activator and interfacial agent on reinforced recycled aggregate mortar modified system of composite excitation agent and interfacial agent on properties of mortar and reinforced effect the interfacial mechanical dry mortar combination of fly ash, carboxymethyl cellulose superabsorbent, naphthalene superplasticizer on recycled aggregate dry mortar performance and mechanism of silica fume; steel slag, water retaining agent and water reducing agent on the influence of recycled aggregate dry plaster performance and mechanism; Study on the fly ash, silica fume, water retaining agent and water reducing agent on the performance of recycled aggregate mortar powder ground and the mechanism.
Experimental results show that the apparent density is much smaller than the natural river sand, porosity and water absorption ratio of natural river sand, aggregate mortar regenerated better mechanical properties than natural sand mortar. Composite activator may have potential cementitious activation in Recycled Aggregate Fractions, and can stimulate the activity of fly ash. To improve the mechanical properties of dry mortar, than adding composite activator 28d compressive strength increased by 5.93%. interface diffusion enhancement agent in the inhibition of polar groups in free water, improve the combination of interface layer, improve the performance of the mortar, than not adding interface reinforcing agent 28d compressive strength increased by 8.71%.M10 regeneration aggregate dry powder mortar is the best ratio of raw materials: grey powder ratio was 1:5.0, with 25% fly ash, compound activator dosage is 0.9%, the interface strengthening agent content is 1.2%, water content is 0.24% The amount of water reducing agent is 1.2%, which meets the requirements of GB/T25181-2010< premixed mortar > M10 dry powder masonry mortar.
Adding carboxymethyl cellulose superabsorbent, dry shrinkage of mortar plastering of recycled aggregate has been significantly improved, in water content is 0.12%, 28d contraction rate was 1.56 per thousand.M15 recycled aggregate mortar powder for the best ratio of raw materials: grey powder is 1:4.0, 18% steel slag, silica fume was 4% steel slag, activator content is 0.5%, 0.9% compound activator, interface enhancer 1.2%, water 0.15%, water reducing agent is 1.5%, meet the requirements of the M15 properties of GB/T25181-2010< dry powder mortar mortar >.
Dry powder mortar of recycled aggregate ground in the incorporation of naphthalene superplasticizer, the frost resistance has been improved to a certain extent, superplasticizer is 1.2%, the frost resistance grade of recycled aggregate mortar powder ground is D35, after 35 freeze-thaw cycles, the mass loss was 2.45% and the strength loss of 17.37%.M20 regeneration dry powder mortar aggregate ground for the best ratio of raw materials: grey powder ratio was 1:4.5, with 25% fly ash, silica fume was 4%, compound activator dosage is 0.9%, the interface strengthening agent content is 1.2%, water content is 0.12%, superplasticizer is 1.2%, meet the requirements of M20 powder the surface properties of GB/T25181-2010< mortar mortar >.

【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU578.1;X799.1

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