共查询到20条相似文献,搜索用时 131 毫秒
1.
超轻混凝土在非结构材料领域具有很大的市场需求。以再生EPS(泡沫聚苯乙烯)颗粒为超轻集料,以水泥为胶凝材料,添加矿物外加剂、增粘剂、憎水剂,可以制备物理力学性能和热工性能优越的300级再生EPS超轻混凝土。介绍了300级再生EPS超轻混凝土的研究结果及其应用。 相似文献
2.
3.
制备了不同泡沫掺量(泡浆比为0、0.5、1、1.5、2、2.5、3、4)及复掺不同聚苯乙烯颗粒(颗粒与泡沫体积比为0.5、1、1.5、2)的轻质混凝土,研究了EPS(Expanded Polystyrene,简称EPS)颗粒对轻质泡沫混凝土强度及收缩性能的影响。随着泡浆比的增大,泡沫混凝土的表观密度和抗压强度逐渐降低,收缩值也随之增大;当泡沫掺量过大时,泡沫混凝土易出现坍模现象,料浆的缺陷也会增多。而复掺EPS颗粒的泡沫混凝土采用EPS颗粒取代部分泡沫,解决了高掺量泡沫的混凝土易坍模的问题;随着EPS颗粒掺量的增加,泡沫混凝土的表观密度和抗压强度值变得稳定,同等密度条件下强度更高,延缓了泡沫混凝土的收缩。 相似文献
4.
采用包覆法,将含有无卤阻燃剂的热固性酚醛树脂胶包覆在预发泡的可发性聚苯乙烯(EPS)珠粒表面,再通过水蒸气发泡、模压成型工艺制备出无卤阻燃EPS泡沫材料.研究了3种无卤阻燃剂(三聚氰胺磷酸盐、三聚氰胺氰尿酸盐和聚磷酸铵)在EPS泡沫材料中的阻燃作用,探讨了聚磷酸铵用量对EPS泡沫材料阻燃性能、力学性能和隔热性能的影响.结果表明,在3种无卤阻燃EPS泡沫材料中,采用聚磷酸铵与酚醛树脂包覆制备的无卤阻燃EPS泡沫材料综合性能最好.当EPS、酚醛树脂和聚磷酸铵质量比为100∶100∶40时,无卤阻燃EPS泡沫材料的综合性能较好,其压缩强度为0.42MPa,弯曲强度为0.70MPa,氧指数(体积分数)为30.5%,导热系数为0.025 6W·m-1·K-1. 相似文献
5.
《建筑节能》2021,(8)
寒区建筑外围护结构附加保温材料能够有效改善室内热环境,降低建筑能耗。EPS、XPS等传统保温板虽然在一定程度上能满足建筑的保温需求,但易开裂脱落且阻燃性差,存在安全隐患。超轻泡沫混凝土具有良好的热工性能和阻燃性能,是理想的无机保温材料,应用前景明朗。建立寒区某简化农宅建筑能耗分析模型,通过EnergyPlus软件研究对比安装超轻泡沫混凝土保温板与EPS、XPS等传统保温材料的建筑全年能耗,并分析外墙保温、屋顶保温形式差异,给出安装不同保温材料建筑全生命周期内总费用。研究结果表明,外墙保温对建筑能耗影响较大;建筑保温材料厚度相同时,超轻泡沫混凝土保温板保温性能优于XPS保温板、EPS保温板;超轻泡沫混凝土保温板厚度采用120 mm时全生命周期总费用最低。 相似文献
6.
试验研究了4种(表观)密度的EPS(发泡聚苯乙烯)混凝土的静态压缩性能和劈裂性能,建立了较低密度EPS混凝土的应力-应变关系模型,赋予了各参数相应的物理意义.结果表明:当EPS混凝土密度较高时,其呈现出明显的准脆性材料特性;当EPS混凝土密度较低时,其呈现出明显的泡沫吸能材料特性.所建立的较低密度EPS混凝土应力-应变关系模型能较好地拟合试验结果.相同相对密度的EPS混凝土,其相对劈裂强度表现出明显的粒子尺寸效应.随EPS混凝土相对密度的降低,其相对劈裂强度粒子尺寸效应逐渐减小. 相似文献
7.
EPS轻质混凝土力学性能研究 总被引:19,自引:0,他引:19
聚苯乙烯泡沫(EPS)混凝土是一种轻质而具有良好吸能功能的新型建材。然而,由于聚苯乙烯泡沫颗料质轻以及其表面的亲油性,使得EPS混凝土在成型过程中易于离析和工作性差,最终导致强度偏低。试验通过采用类似“裹砂”工艺的预拌方法拌制EPS混凝土并测试了力学性能。研究表明,通过部分取代粗集料和细集料,可以制得表观密度在800kg/m^3~1800kg/m^3、抗压强度为10MPa~25MPa的EPS混凝土。试验结果同时表明:微硅粉和氯丁胶乳在适当的养护条件下能显著改善聚苯乙烯泡沫颗粒与水泥浆体的粘结性能,提高EPS混凝土的抗压强度。 相似文献
8.
通过向低水灰比高流动性水泥浆中掺入不同比例的泡沫和EPS颗粒,制备了一系列200 kg/m3超轻EPS复合泡沫混凝土,并测试了强度、吸水率、软化系数、干缩、导热系数等性能.结果表明,EPS颗粒的引入可以提高复合体系的强度,降低吸水率,提高软化系数,降低干缩,不会明显影响导热系数,表明EPS可作为制备超轻泡沫混凝土的优质填充料. 相似文献
9.
以磷酸镁水泥(magnesium phosphate cement,MPC)为胶凝材料制备出了表观密度为1 800~750 kg/m~3的可用于结构的磷酸镁水泥-聚苯乙烯泡沫(MPC-EPS)混凝土.试验研究了MPC-EPS混凝土的力学性能、干缩性能、吸水率及抗冻融和干湿循环能力.结果表明:MPC-EPS混凝土具有较高的早期强度,且EPS掺量越大,其早期强度发展越快;与普通水泥为胶凝材料的EPS混凝土相比,MPC-EPS混凝土具有较低的干缩变形和吸水率,是一种耐久性良好的保温隔热材料. 相似文献
10.
为提出合理的EPS轻质混凝土设计方法,对泡沫混凝土设计方法进行改进.设计了不同密度不同掺合料的多种EPS轻质混凝土配合比.测试了不同配合比、不同龄期下EPS轻质混凝土干密度和抗压强度.结果表明这种配合比设计方法应用于EPS轻质混凝土设计是可行的. 相似文献
11.
12.
13.
结合具体工程实例,介绍了气泡轻质土在公路工程中的应用,分别阐述了轻质气泡土施工工艺、适用情况及经济效益等内容,实践证明,轻质气泡土能大幅度降低填土荷载,提高路堤稳定性,且施工工期短,值得推广。 相似文献
14.
Decorative tiles and mouldings made of polymeric foams are getting more popular in buildings. There are health, safety and environmental concerns on these products and their use in the buildings. In this paper, we report the results of the study and discuss about concerns of decorative mouldings made of expanded polystyrene (EPS). Physical damage to the structure of the building, potential harms to residents and health hazards were found as main concerns in this regard. The use of decorative mouldings made of EPS in the buildings is the subject to some considerations. The climate conditions play significant role in the feasibility of usage of decorative mouldings in the buildings. Although these products may add some aesthetic effects to the building's exterior view, the observations and results of this study do not support the use of the products in the buildings. Decorative mouldings bring significant safety and health risks, and it is recommended that for usage in buildings, particularly residential ones, the decorative moulding to be made of non-flammable light-weight materials or to be completely excluded from the buildings. 相似文献
15.
《Soils and Foundations》2002,42(4):29-41
The use of a compressible layer such as expanded polystyrene blocks behind a rigid retaining wall and geogrid layers embedded in a dense granular backfill is examined as a reinforcement technique for retaining wall structures. The mobile model retaining walls adjacent to reinforced model specimens are subjected to different surcharge pressures, and are caused to move laterally to measure the lateral earth pressure during the wall movement. The coefficients of earth pressure at rest and active earth pressure are carefully inferred from test results. Three series of tests are conducted; one test series with expanded polystyrene blocks installed behind the wall, another with geogrid layers embedded within model specimens, and the last series with expanded polystyrene blocks installed behind the wall and geogrid layers fixed between two adjacent expanded polystyrene blocks and embedded within model specimens. The reductions in the earth pressure at rest and the active earth pressure due to various patterns of reinforcement are interpreted in relation to the concept of controlled yielding of compressible expanded polystyrene blocks, tensile strains induced along geogrid layers, fixity between expanded polystyrene blocks and geogrid layers, and a facing unit consisting of expanded polystyrene blocks. 相似文献
16.
17.
18.
This paper presents a new kind of material for use in highway embankments in the soft soil of the Yangzi River delta. The
experimental study was carried out first to evaluate the effectiveness of the proposed material, using different mixtures
of river sand, cement and expanded polystyrene beads. This was confirmed by numerical modeling which indicated both its suitability
as regards strength and a reduced settlement compared with the general lime stabilized soil embankments. The environmental
advantage is that it utilized river sand which has to be removed to retain the profile of the river bed. 相似文献
19.