本文選題：輕質高強 + 免燒輕骨料�。� 參考：《東南大學》2017年碩士論文

【摘要】：隨著建筑節(jié)能要求的提高,輕質高強與保溫一體化是建筑材料發(fā)展趨勢之一。輕骨料泡沫混凝土兼具泡沫混凝土輕質保溫與輕骨料混凝土高比強的優(yōu)勢于一體,成為高強保溫材料的發(fā)展方向。制備高比強免燒輕骨料,研究物料性能、用水量、核-殼層厚度關系、養(yǎng)護方式等因素與輕骨料性能關系,研究表明,使用3mm直徑EPS顆粒作為內核,物料比例為C:FA:CH=5:4:1并控制殼層厚度為2mm、成球用水量為15%,采用75:蒸養(yǎng)條件制備700級輕骨料,其筒壓強度為8.OMPa。在核殼型免燒輕骨料研究基礎上進一步采用相變材料制備相變儲熱型免燒輕骨料,制備1400kg/m~3密度等級輕骨料混凝土,28d抗壓強度分別為 12.5MPa、18.2MPa,導熱系數(shù)分別為 0.26W/(m·K)、0.30W/(m·K)。研究工程用輕骨料混凝土流變性能,分析了流變性能指標(屈服剪切應力σ0、塑性粘度n)與混凝土新拌性能、泵送性能關系,漿體粘度合理范圍為2.0Pa·s～3.0Pa·s,屈服剪切應力合理范圍為75Pa～125Pa。分析了孔隙率與孔徑分布對輕骨料混凝土性能影響,采用MIP法研究輕骨料對基體孔結構的影響,輕骨料摻量為30%、40%時基體相平均孔徑分別為20.4nm、31.4nm,28d抗壓強度分別為37.5MPa、21.3MPa。研究了輕骨料多孔混凝土泵送性能,結果表明,保證輕骨料多孔混凝土泵送性時壓力泌水率BP合理范圍為35%～45%,V140范圍為2～11mL。采用混料設計方法研究漿體、輕骨料、泡沫體積分量對輕骨料泡沫混凝土性能影響,使用不同擬合方式優(yōu)選得到得到混凝土性能回歸方程,并通過回歸方程對混凝土性能進行預測,優(yōu)化不同密度等級配合比,制備高比強、低導熱系數(shù)輕骨料泡沫混凝土。優(yōu)化后1400 kg/m~3密度等級輕骨料泡沫混凝土 28d抗壓強度為30.3MPa,導熱系數(shù)為0.262W/(m·K),對比普通輕骨料混凝土,強度與保溫性能都顯著提升。
[Abstract]:With the improvement of building energy conservation requirements, the integration of lightweight and high strength and heat preservation is one of the development trends of building materials. Light aggregate foam concrete has the advantages of light thermal insulation of foam concrete and high ratio of light aggregate concrete, and has become the development direction of high strength insulation material. The properties of lightweight aggregates with high specific strength and no burning were studied. The relationship between material performance, water consumption, core-shell thickness and curing mode was studied. The results showed that the 3mm diameter particles were used as the core. The material ratio is CFAA: Ch 5: 4: 1 and the shell thickness is 2 mm and the water consumption is 15 mm. The 700 grade lightweight aggregate is prepared by 75: evaporation condition. The cylinder pressure strength is 8.OMPa. Based on the study of core-shell non-fired lightweight aggregate, phase change material was further used to prepare phase-change heat storage non-fired lightweight aggregate. The compressive strength of 1400kg/m~3 density grade lightweight aggregate concrete was 12.5MPa (18.2 MPa) for 28 days, and the thermal conductivity was 0.26W / m ~ (-1) 0.30W / m ~ (-1) K, respectively. The rheological properties of lightweight aggregate concrete used in engineering are studied. The relationship between the rheological properties (yield shear stress 蟽 0, plastic viscosity n) and the fresh mixing performance of concrete is analyzed. The relation of pumping performance, the reasonable range of slurry viscosity is 2.0 Pa / s, and the reasonable range of yield shear stress is 75 Pa / 125Pa. The effects of porosity and pore size distribution on the properties of lightweight aggregate concrete were analyzed. The effect of light aggregate on matrix pore structure was studied by MIP method. The pumping performance of porous lightweight aggregate concrete is studied. The results show that the reasonable range of pressure bleeding rate BP is 35 ~ 45V _ (140) and 21.11 mL / L when the pumping property of lightweight aggregate porous concrete is guaranteed. The effects of slurry, lightweight aggregate and foam volume component on the properties of lightweight aggregate foam concrete were studied by mixing design method. The regression equation of concrete performance was obtained by using different fitting methods. The performance of concrete was predicted by regression equation, and the mix ratio of different density grades was optimized to prepare high ratio and low thermal conductivity lightweight aggregate foam concrete. After optimization, the compressive strength and thermal conductivity of 1400 kg/m~3 density grade lightweight aggregate foam concrete are 30.3MPa and 0.262 W / m K ~ (-1) respectively. Compared with ordinary lightweight aggregate concrete, the strength and thermal insulation properties are improved significantly.
【學位授予單位】：東南大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU528

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