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水泥粘土砂浆咬合桩应用研究 被引量:8
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作者 林奇 《福建工程学院学报》 CAS 2010年第1期9-11,86,共4页
深基坑工程施工止水问题影响到地下工程的施工质量、施工效率、施工环境和施工安全。文章结合工程实例,提出水泥粘土砂浆咬合桩止水技术。对水泥粘土砂浆成桩性能、水泥粘土砂浆咬合桩特点和施工方法进行研究,开辟一条基坑止水技术新途径。
关键词 水泥粘土砂浆 咬合桩 止水帷幕 深基坑工程
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Effects of Cationic Surfactant on Fresh and Hardened Properties of Cement-Based Mortar 被引量:2
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作者 Soumaya Zormati Fadhel Aloulou Habib Sammouda 《Journal of Renewable Materials》 SCIE EI 2023年第5期2345-2365,共21页
The objective of this study is to analyze the effects of using surfactant(CTAB)and cellulose nanofibers(NFC)as an admixture in cement mortars.We examined composite properties as porosity,compression energy,thermal con... The objective of this study is to analyze the effects of using surfactant(CTAB)and cellulose nanofibers(NFC)as an admixture in cement mortars.We examined composite properties as porosity,compression energy,thermal conductivity and hydration.The results showed that with the addition of 0.7%by weight of NFC per emulsion in the presence of a cationic surfactant(CTAB).The new material produced presented a dry porosity between 4.7%and 4.4%,compressive strength between 9.8 and 22.9 MPa,and thermal conductivity between 0.95 and 2.25 W·m^(−1)·K^(−1).Thus we show better mechanical and thermal performance than that traditional Portland cement mortar with a density similar.In addition,the mortar made by emulsion of ordinary portland cement,cellulose nanofiber and organophilic clay(OC)treated with cetyltrimethylammonium bromide(CTAB)obtained has good resistance under high temperature and water,as well as excellent thermal insulation performance under high temperature and humidity conditions.This study verified that the presence of NFC promotes hydration,leading to the production of more calcium silicate and portlandite gel. 展开更多
关键词 Cement nanofiber cellulose organophile-clay thermal conductivity hydration surfactant compressive strength MORTAR
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水泥-粘土复合粉混合砂浆早期强度研究 被引量:1
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作者 陈欢 刘飞 +3 位作者 张健 程阳 何国顺 王延磊 《粘接》 CAS 2021年第10期94-97,共4页
本文利用室内试验,对水泥-粘土复合粉混合砂浆早期强度进行研究,对不同龄期、掺量对水泥土强度影响进行分析,得到材料应力-应变全过程曲线,得到合适水泥土配比。通过分析试验结果表示,水泥土无侧限抗压强度在龄期不断增长过程中不断的增... 本文利用室内试验,对水泥-粘土复合粉混合砂浆早期强度进行研究,对不同龄期、掺量对水泥土强度影响进行分析,得到材料应力-应变全过程曲线,得到合适水泥土配比。通过分析试验结果表示,水泥土无侧限抗压强度在龄期不断增长过程中不断的增大,养护龄期为7~21d时候的无侧限抗压强度迅速增长。添加水泥能够对土体性能进行改善,并且在水泥掺量增长过程中增加。添加适量的粘土,此混合砂浆材料能够在注浆加固工程中使用。 展开更多
关键词 水泥 粘土 砂浆 混合砂浆
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临河高水位基坑水泥粘土砂浆止水桩的应用 被引量:2
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作者 孔秋平 《福建建设科技》 2017年第4期9-11,共3页
本文结合某临河高水位基坑工程实例介绍水泥粘土砂浆止水桩的应用情况以及施工技术要点,对低强度水泥粘土砂浆性能、水泥粘土砂浆止水桩特点和采用双回旋套管取土咬合施工方法进行总结,给深基坑支护工程提供一种新的止水技术。
关键词 水泥粘土砂浆桩 低强度 止水技术
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Causes of Cracks on Structures in Ngara-Tanzania
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作者 Fikiri Fredrick Magafu Wu Li 《Engineering(科研)》 2010年第12期958-961,共4页
Development of macro and micro cracks on plastered walls and floors have been studied at different sites under site investigation whereby building inspections, construction history, engineering properties of soil and ... Development of macro and micro cracks on plastered walls and floors have been studied at different sites under site investigation whereby building inspections, construction history, engineering properties of soil and building surroundings assessment were conducted. We did revision of structural calculations and laboratory experiment to find out the source of cracks. Micro and macro cracks have no structural problems on the structure so long as the developed cracks are within the serviceability limit state [1]. There are two main causes of cracks in the structure that are structural and nonstructural sources [2]. The first task was to identify whether the source of cracks are structural or non structural. During site investigation the modes of crack formation, depth and length of crack, crack patterns and direction were studied at different sites in Ngara. Theoretical calculations of crack width and particles size distribution of sand from three main sources were analyzed after performing both sieve analysis and decantation tests. In depth site investigation, literature review and laboratory tests result showed that the causes of cracks are nonstructural and all three reliable sources of sand in Ngara contain more quantities of fines than that specified in BS 882. This paper is looking for the causes of cracks on structures and recommending further research on new idea of using simple technology and low cost methods that is affordable by both the government of Tanzania and local community of Ngara to overcome the problem of structures that develop micro and macro cracks. 展开更多
关键词 MACRO Cracks Micro Cracks LIME Stabilized Cement-Sand MORTAR SILT and CLAY Soils
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水泥-粘土复合粉混合砂浆28d强度早期推定
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作者 谢军 薛斌 +4 位作者 阎杰 王立新 徐永峰 丛晓红 赵飞 《河北建筑工程学院学报》 CAS 2013年第3期8-9,13,共3页
在水泥-粘土复合粉混合砂浆配合比设计的基础上利用7d强度对28d强度进行早期的推定;运用数理统计的方法,建立不同的回归方程并对结果进行比较,结果指数方程稳定性好;28d强度早期推定对建筑工程实践提供了科学依据.
关键词 水泥-粘土复合粉 混合砂浆 28d强度 早期推定
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