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A. Y. B. Anifowose 《Bulletin of Engineering Geology and the Environment》2000,58(2):151-157
Some lateritic soils derived from different parent rocks in the Akure area of Nigeria were studied. The laboratory investigations indicated that most of these tropical soils, which were erroneously referred to as lateritic clays, actually contained very low proportions of clay particles. Migmatite-derived soils were found to respond better to stabilisation than those derived from charnockite. Firing was found to be the most important way of improving the durability of lateritic soil blocks as sintering takes place within the soil grain interstices. Iron concretions may be deleterious as they serve as focal points for sample failure. Received: 28 September 1994 · Accepted: 6 June 1999 相似文献
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研究水灰比、煅烧煤矸石和外加剂掺量等因素对煤矸石灌浆材料性能的影响,对浆液的黏度、密度、析水率、凝结时间及其固化后的强度进行了测定。结果表明:水灰比、煅烧煤矸石掺量是影响灌浆材料物理性能的主要因素,在加入适量外加剂的条件下,煅烧煤矸石掺量60%制得的灌浆材料,其28d最高结石强度和固砂强度分别可达到50MPa和53MPa,完全可以替代水泥浆液作为灌浆材料。 相似文献
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现代建筑,首先让人们想到的是区别于传统建筑,并且在采用的材料、施工技术等均有较大的突破.显然,这是现代建筑的基本特征.现代建筑还必须符合循环经济的要求,即要求按照生态规律组织生产、消费和处理废物,合理利用自然资源和环境容量,在物质不断循环利用的基础上发展经济,使经济系统和谐地纳入到自然生态系统的物质循环过程中. 相似文献
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Wood and biomass (branches and foliage) of five Mediterranean evergreen hardwood species (Quercus coccifera, Quercus ilex, Arbutus unedo, Phillyrea latifolia, Erica arborea) growing in Greece were investigated as particleboard raw material. The average diameter of the stems varied between the species from 4.1 cm (Erica arborea) to 7.5 cm (Quercus ilex) and the bark to wood ratio of the stems varied between the species from 7.8% (Quercus ilex) to 15.9% (Erica arborea). 相似文献
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分析了真空挤出机真空箱的构成及其作用,论述了减少或消除真空箱堵塞的原因和危害性。提出了减少或消除真空箱堵塞的有效途径,有利于获得产量大、产品质量好和成品率高的砖瓦坯体。 相似文献
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本刊讯 9月11日,中国建筑材料联合会会同国家建筑材料展贸中心、中国建材机械工业协会、中国建筑卫生陶瓷协会、中国石材工业协会、中国建筑玻璃与工业玻璃协会、中国绝热隔音材料协会、中国建筑材料联合会混凝土外加剂分会等单位,以及荣获2007年“中国名牌产品”称号的建材企业,在人民大会堂召开2007年建材行业中国名牌产品媒体见面会暨庆祝酒会。 相似文献
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par Brajendra Kumar Gupta 《Building Research & Information》2013,41(2):103-105
Wartime devastation and a serious shortage of fired bricks, cement, lime and steel, as well as transport difficulties, prompted the authorities in the German Democratic Republic to promote the use of local loam as a construction material. This summary of experiences is taken from a full report on the subject* 相似文献
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《Building Research & Information》1974,2(2):103-105
Wartime devastation and a serious shortage of fired bricks, cement, lime and steel, as well as transport difficulties, prompted the authorities in the German Democratic Republic to promote the use of local loam as a construction material. This summary of experiences is taken from a full report on the subject* 相似文献
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燃气中H2S是一种带臭味的无色气体,燃烧时可生成一种有毒物SO2,使用前必须先将其脱除。选择合适的脱硫方法,使用优质的脱硫剂是本文研究的课题。 相似文献
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大力发展煤矸石的综合利用 总被引:11,自引:0,他引:11
我国煤炭年产量约10亿t,居世界第一位.煤炭生产和加工中产生的固体废弃物一煤矸石,目前累计堆存近40亿t,占地约100 hm2,而且每年约以一亿吨的速度递增.煤矸石已是我国排放量最大的工业固体废弃物之一.煤矸石长期堆存和自燃,不仅侵占大量珍贵土地,而且污染大气和地下水质,构成了对环境的威胁.煤矸石综合利用是资源综合利用的重要内容,是我国以煤为主的能源结构的必然选择,也是实施可持续发展战略的重要措施之一.因此,我们必须以长远发展战略的高度充分认识煤矸石综合利用的重要意义. 相似文献
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Previous studies have been carried out on calcined phosphogypsum (PG) for making the building materials. The present study was focused on autoclaved PG and its use in making load-bearing wall bricks. Autoclaved PG was prepared from original waste PG with steam pre-treatment. The crystalline phase, morphology, and thermal characteristics of original waste PG and autoclaved PG were investigated by XRD, SEM, and SDT. Then bricks of the size of Chinese standard brick were prepared from different types of PG in the PG-fly ash–lime–sand system. Results showed that the compressive strength of bricks from autoclaved PG by lower-pressure steam of 0.12 MPa, 120 °C for 16 h was much higher. The flexural strength and compressive strength of the bricks could reach 4.0 MPa and 15.0 MPa, respectively. The durability of the bricks was investigated by 15 freezing–thawing cycles at temperatures from ?20 °C to 20 °C, and the weight loss was only 0.029% after all of cycles. Hemihydrates (CaSO4 · 0.5H2O) were dehydrated products from dihydrates in original PG with lower-pressure steam treatment, and hemihydrates were susceptible to absorbing the humidity and were transformed into densified re-crystallization gypsum (CaSO4 · 2H2O) that contributed to the final strength of bricks. Microstructural characteristics of bricks were investigated by XRD and SEM. Tobermorite was the significant hydrated product, which contributed to the strength of bricks. The use of autoclaved PG for making load-bearing wall bricks was recommended instead of conventional burnt clay bricks. 相似文献
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近年来受能源日益紧张的影响,节能产品受到各国重视,国家、地方相继出台了一系列建筑节能政策,使节能材料在建筑领域的应用越来越广。板类产品以其利废、节能、节土等特点及特殊功能,在建筑中扮演着越来越重要的角色。随着新产品的层出不穷,我们的视野也应不断扩大:对一些在我国已发展较成熟的产品要有一个正确的认识,同时对一些新产品要善于应用和推广。本文列举的几种板类产品只是众多板材中的一个缩影。(一)G R C轻质墙板1、产品特点及用途GRC是GlassFiberRinforcedCement(玻璃纤维增强水泥)的缩写,是一种新型轻质墙体材料,近年来已… 相似文献