超低密度泡沫混凝土的研究

发布时间：2018-04-19 23:04

本文选题：超低密度泡沫混凝土 + 硫铝酸盐水泥　；参考：《湖南大学》2013年硕士论文

【摘要】：泡沫混凝土作为一种轻质多孔材料，具有轻质、保温隔热性能好、防火性能优良等特点，已广泛应用于建筑工程。众所周知，泡沫混凝土的密度越小，导热系数越低，保温隔热效果也越好。因此，泡沫混凝土作为一种无机保温材料，其优异的保温隔热性能，预示着超低密度泡沫混凝土产品的研发必将是泡沫混凝土行业未来的一个发展方向。然而，超低密度泡沫混凝土目前大多采用硫铝酸盐等特种水泥来生产，相对普通硅酸盐水泥来说，特种水泥的成本高，，因而阻碍了超低密度泡沫混凝土作为保温材料的进一步发展。为了解决这一问题，本课题研究开发以普通硅酸盐水泥为主要胶凝材料的超低密度泡沫混凝土；另外，为了获得更加优异的保温性能，旨在研制出密度等级100kg/m3以下的超低密度泡沫混凝土。本试验研究了水泥品种、水灰比、矿物掺合料以及温度对超低密度泡沫混凝土的影响。试验结果表明，采用硫铝酸盐水泥，在实验室中可以研制出干密度87.7kg/m3的超低密度泡沫混凝土。在保持硫铝酸盐水泥掺量为7.5%的情况下，以硅酸盐水泥为主要胶凝材料，探究了硅灰、早强剂、纤维素醚和聚丙烯纤维对普硅-硫铝泡沫混凝土抗压强度的影响。试验结果表明：在密度等级为400kg/m3，当甲基纤维素和聚丙烯纤维的掺量为0.2%时，能大大提高泡沫混凝土的抗压强度，此时其抗压强度可高达1.34MPa，高于同密度等级下快硬硫铝酸盐水泥泡沫混凝土，也远高于市场同类产品。此外，试验还研究了泡沫混凝土干密度与抗压强度和导热系数之间的关系。试验结果表明：泡沫混凝土干密度越小，抗压强度越低，导热系数越小。另外，通过孔结构研究，分析了泡沫混凝土气孔结构与强度之间的关系，结果表明：孔径越小，分布越均匀，其抗压强度越高。
[Abstract]:Foam concrete, as a light porous material, has the characteristics of light quality, good heat insulation and heat insulation, good fire resistance and so on. It has been widely used in construction engineering. It is known that the smaller the density of the foam concrete, the lower the thermal conductivity, the better the heat insulation effect. Therefore, the foam concrete is a kind of inorganic insulation material, and its excellent protection is guaranteed. The performance of thermal insulation indicates that the research and development of super low density foam concrete product will be a future development direction of foam concrete industry. However, most of ultra-low density foam concrete is produced by special cement such as sulphate and aluminate, and the cost of special cement is higher than that of ordinary portland cement, which hinders the ultra low density. In order to solve this problem, this subject studies and develops ultra low density foam concrete with ordinary portland cement as the main cementitious material. In addition, in order to obtain more excellent thermal insulation performance, the purpose of developing super low density foam concrete below 100kg/m3 density grade is to develop.
The effect of cement variety, water cement ratio, mineral admixture and temperature on ultra-low density foam concrete was studied in this experiment. The experimental results show that the ultra low density foam concrete with dry density 87.7kg/m3 can be developed in the laboratory by using sulphoaluminate cement. In the case of keeping the content of thioaluminate cement 7.5%, the silicate salt water is used. As the main cementitious material, the effect of silica fume, early strength agent, cellulose ether and polypropylene fiber on the compressive strength of pericosulfate aluminum foam concrete is investigated. The test results show that the compressive strength of the foam concrete can be greatly increased when the density grade is 400kg/m3, when the dosage of methyl cellulose and polypropylene fiber is 0.2%, the compression strength of the foam concrete can be greatly improved. The strength can be as high as 1.34MPa, higher than that of fast hardening sulphoaluminate cement foam concrete under the same density level, which is much higher than that of similar products in the market.
In addition, the relationship between the dry density of the foam concrete and the compressive strength and the thermal conductivity is also studied. The test results show that the smaller the dry density of the foam concrete is, the lower the compressive strength and the smaller the thermal conductivity. In addition, the relationship between the pore structure and the strength of the foam concrete is analyzed by the pore structure. The results show that the more pore size is, the more pore size is. The more uniform the distribution is, the higher the compressive strength.

【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU528.2

【参考文献】