利用廢棄粘土磚制備泡沫混凝土的試驗研究
發(fā)布時間：2018-11-09 19:41
【摘要】：隨著建筑行業(yè)快速穩(wěn)定發(fā)展，大量磚混結(jié)構(gòu)建筑物被新型建筑物代替，拆除的廢棄粘土磚成為難以處理的建筑垃圾。廢棄粘土磚經(jīng)過分揀、破碎、磨細等手段，可以得到再生廢磚骨料和再生膠凝材料磚粉，廢磚粉在激發(fā)劑作用下有較好的活性，適用于泡沫混凝土砌塊等墻體材料。 本文針對影響廢磚泡沫混凝土性能的泡沫劑體系組成、膠凝材料體系組成、激發(fā)劑體系組成、外加劑等主要因素，采用室內(nèi)試驗及理論分析的方法，得到滿足泡沫混凝土行業(yè)標(biāo)準(zhǔn)的最佳配合比，以及干表觀密度、28d立方體抗壓強度、干縮率、吸水率與凍融指標(biāo)、碳化指標(biāo)等大量試驗數(shù)據(jù)。 主要得到以下結(jié)論：選用十二烷基苯磺酸鈉作為發(fā)泡劑，稀釋比例為1:50，羥丙基甲基纖維素醚作為穩(wěn)泡劑，摻入比例為0.12%，泡沫性能符合要求，可以用于廢磚泡沫混凝土中；堿或硫酸鹽能激發(fā)磚粉中的活性成分，當(dāng)摻入15%石膏和20%石灰時，廢磚泡沫混凝土力學(xué)性能優(yōu)于其他激發(fā)劑組成；聚羧酸高效減水劑與廢磚泡沫混凝土適應(yīng)性良好，當(dāng)其摻量在0.9%~1.5%之間時，廢磚泡沫混凝土工作性好，干表觀密度達到設(shè)計值；膠凝材料組成是影響廢磚泡沫混凝土力學(xué)性能和吸水率的主要因素，當(dāng)膠凝材料水泥:磚粉:粉煤灰為70:10:20時，廢磚泡沫混凝土28d抗壓強度大于5.5MPa，考慮到最大程度使用工程廢棄物，采用水泥:磚粉:粉煤灰為60:20:20的組成，此時廢磚泡沫混凝土28d立方體抗壓強度不小于4.0MPa；廢棄粘土磚作為細骨料摻入泡沫混凝土中時，可制備符合泡沫混凝土行業(yè)標(biāo)準(zhǔn)FC A10-C2-W20-JG/T266-2011的砂系廢磚泡沫混凝土，，節(jié)約水泥147kg/m3，節(jié)約砂223.3kg/m3。 試驗制備出符合泡沫混凝土行業(yè)標(biāo)準(zhǔn)FCA06-C4-W25-JC/T266-2011的廢磚泡沫混凝土，干表觀密度635.1kg/m3，28d立方體抗壓強度4.6MPa，吸水率24.0%，凍融后質(zhì)量損失3%、強度損失18%，碳化系數(shù)0.87，導(dǎo)熱系數(shù)0.127，性能符合GB0574-2010《墻體材料應(yīng)用統(tǒng)一技術(shù)規(guī)范》中A3.5的要求，可用作外墻保溫材料或填充墻等，與同密度等級傳統(tǒng)泡沫混凝土相比節(jié)約水泥100kg/m3，不僅響應(yīng)國家近年來建筑材料節(jié)能利廢的政策號召，而且具有突出的產(chǎn)品經(jīng)濟效益和社會效益，應(yīng)用前景廣泛。
[Abstract]:With the rapid and stable development of the construction industry, a large number of brick and concrete structures have been replaced by new buildings. After sorting, crushing and grinding waste clay bricks, recycled brick aggregate and reclaimed cementitious brick powder can be obtained. The waste brick powder has good activity under the action of activator, and is suitable for wall materials such as foam concrete block. In this paper, the composition of foaming agent system, the composition of cementitious material system, the composition of activator system and admixture, etc., which affect the properties of foamed concrete with waste brick, are analyzed by laboratory test and theoretical analysis. The optimum mix ratio, dry apparent density, 28d cube compressive strength, dry shrinkage rate, water absorption, freeze-thaw index, carbonation index and so on were obtained. The main conclusions are as follows: sodium dodecylbenzene sulfonate was selected as foaming agent, the dilution ratio was 1: 50, hydroxypropyl methyl cellulose ether was used as foaming stabilizer, the proportion of sodium dodecyl benzene sulfonate as foaming agent was 0.12. Can be used in waste brick foam concrete; When 15% gypsum and 20% lime were added, the mechanical properties of waste brick foam concrete were superior to those of other activators. The polycarboxylic acid superplasticizer has good adaptability to waste brick foam concrete. When the content of polycarboxylic acid superplasticizer is between 0.9% and 1.5%, the waste brick foam concrete has good workability and dry apparent density reaches the design value. The composition of cement material is the main factor that affects the mechanical properties and water absorption of waste brick foam concrete. When cement: brick powder: fly ash is 70:10:20, the compressive strength of waste brick foam concrete is more than 5.5 MPA. Considering the maximum use of engineering waste, the cement: brick powder: fly ash is composed of 60:20:20, and the compressive strength of waste brick foam concrete is not less than 4.0MPa for 28d. When waste clay brick is mixed into foamed concrete as fine aggregate, sand series waste brick foam concrete conforming to FC A10-C2-W20-JG/T266-2011 standard of foam concrete industry can be prepared, which can save 147kg / m ~ 3 cement and 223.3kg / m ~ 3 sand. The waste brick foam concrete conforming to the industry standard of foam concrete (FCA06-C4-W25-JC/T266-2011) was prepared. The dry apparent density was 635.1 kg / m 328d cube compressive strength was 4.6 MPA, the water absorption was 24.0%, and the mass loss after freezing and thawing was 3%. Strength loss 18, carbonization coefficient 0.87, thermal conductivity 0.127. The performance meets the requirements of A3.5 in GB0574-2010 uniform Technical Specification for the Application of Wall Materials, and can be used as thermal insulation material for external walls or filled walls, etc. Compared with the traditional foam concrete of the same density grade, cement is saved by 100 kg / m ~ (3), which not only responds to the policy call of building materials in recent years to save energy and benefit from waste, but also has outstanding economic and social benefits, and has a wide application prospect.
【學(xué)位授予單位】：內(nèi)蒙古科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU528
本文編號：2321372
[Abstract]:With the rapid and stable development of the construction industry, a large number of brick and concrete structures have been replaced by new buildings. After sorting, crushing and grinding waste clay bricks, recycled brick aggregate and reclaimed cementitious brick powder can be obtained. The waste brick powder has good activity under the action of activator, and is suitable for wall materials such as foam concrete block. In this paper, the composition of foaming agent system, the composition of cementitious material system, the composition of activator system and admixture, etc., which affect the properties of foamed concrete with waste brick, are analyzed by laboratory test and theoretical analysis. The optimum mix ratio, dry apparent density, 28d cube compressive strength, dry shrinkage rate, water absorption, freeze-thaw index, carbonation index and so on were obtained. The main conclusions are as follows: sodium dodecylbenzene sulfonate was selected as foaming agent, the dilution ratio was 1: 50, hydroxypropyl methyl cellulose ether was used as foaming stabilizer, the proportion of sodium dodecyl benzene sulfonate as foaming agent was 0.12. Can be used in waste brick foam concrete; When 15% gypsum and 20% lime were added, the mechanical properties of waste brick foam concrete were superior to those of other activators. The polycarboxylic acid superplasticizer has good adaptability to waste brick foam concrete. When the content of polycarboxylic acid superplasticizer is between 0.9% and 1.5%, the waste brick foam concrete has good workability and dry apparent density reaches the design value. The composition of cement material is the main factor that affects the mechanical properties and water absorption of waste brick foam concrete. When cement: brick powder: fly ash is 70:10:20, the compressive strength of waste brick foam concrete is more than 5.5 MPA. Considering the maximum use of engineering waste, the cement: brick powder: fly ash is composed of 60:20:20, and the compressive strength of waste brick foam concrete is not less than 4.0MPa for 28d. When waste clay brick is mixed into foamed concrete as fine aggregate, sand series waste brick foam concrete conforming to FC A10-C2-W20-JG/T266-2011 standard of foam concrete industry can be prepared, which can save 147kg / m ~ 3 cement and 223.3kg / m ~ 3 sand. The waste brick foam concrete conforming to the industry standard of foam concrete (FCA06-C4-W25-JC/T266-2011) was prepared. The dry apparent density was 635.1 kg / m 328d cube compressive strength was 4.6 MPA, the water absorption was 24.0%, and the mass loss after freezing and thawing was 3%. Strength loss 18, carbonization coefficient 0.87, thermal conductivity 0.127. The performance meets the requirements of A3.5 in GB0574-2010 uniform Technical Specification for the Application of Wall Materials, and can be used as thermal insulation material for external walls or filled walls, etc. Compared with the traditional foam concrete of the same density grade, cement is saved by 100 kg / m ~ (3), which not only responds to the policy call of building materials in recent years to save energy and benefit from waste, but also has outstanding economic and social benefits, and has a wide application prospect.
【學(xué)位授予單位】：內(nèi)蒙古科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU528
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