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Substitution of Aggregates in Concrete and Mortar with Coltan Mining Waste: Mechanical, Environmental, and Economic Impact Case Study
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作者 Alinabiwe Nyamuhanga Ally Élodie Ruffine Zang +5 位作者 Masika Muhiwa Grâce Manjia Marcelline Blanche Ursula Joyce Merveilles Pettang Nana Ngapgue François Bella Nabil Chrispin Pettang 《Journal of Minerals and Materials Characterization and Engineering》 2024年第2期139-163,共25页
The mining process involves drilling and excavation, resulting in the production of waste rock and tailings. The waste materials are then removed and stored in designated areas. This study aims to evaluate the mechani... The mining process involves drilling and excavation, resulting in the production of waste rock and tailings. The waste materials are then removed and stored in designated areas. This study aims to evaluate the mechanical strength and the environmental and economic impact of using Coltan Mining Waste (CMW) as a substitute for aggregates in concrete and mortar production. To achieve this, the CMW needs to be characterised. The Dreux Gorisse method was primarily used to produce concrete with a strength of 20 MPa at 28 days. The mortars, on the other hand, were formulated according to the NF P 18-452 standard. The environmental impact of using CMW as substitutes for natural aggregates in the production of concrete and mortar was analysed using SimaPro software. The results showed that mortars and concrete made with CMW have comparable compressive strengths to the reference mortar and concrete;reduce the negative impact on ecosystem quality, human health, resources, and climate change. It has also been shown that the substitution of aggregates by CMW reduces the cost of concrete and mortar as a function of the distance from the aggregate footprint. 展开更多
关键词 AGGREGATE Coltan Mining Waste CONCRETE mortar Mechanical strength Life Cycle Analysis
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Strength and Microstructure of Mortar Containing Glass Powder and/or Glass Aggregate 被引量:1
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作者 刘数华 WANG Shu +4 位作者 ZHOU Wei LI Lihua XIAO Henglin WEI Jianpeng TANG Wan 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2016年第6期1302-1310,共9页
The compressive strength of mortar containing glass powder(GP) and/or glass aggregate(GA) was tested, and its microstructure was also studied by thermogravimetric and differential thermal analysis(TG-DTA), scann... The compressive strength of mortar containing glass powder(GP) and/or glass aggregate(GA) was tested, and its microstructure was also studied by thermogravimetric and differential thermal analysis(TG-DTA), scanning electron microscopy(SEM), energy dispersive spectroscopic analysis(EDX), and X-ray diffraction(XRD) techniques. The incorporation of GA would decrease the compressive strength of the mortar in the absence of GP. Incorporating both GA and GP could change the hydration environment, promote pozzolanic reaction of GP and improve the compressive strength. GP does not lead to but can effectively control ASR(Alkali Silica Reaction). GP and GA do not transform the type of hydrates, but have a great influence on the amounts of hydration products, and generate more calcium silicate hydrate(C-S-H gel) with lower Ca/Si ratio. GP and GA with good gradation will make the microstructure denser. 展开更多
关键词 glass powder glass aggregate mortar strength microstructure
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Compressive Strength Development and Microstructure of Cement-asphalt Mortar 被引量:7
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作者 王强 阎培渝 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2011年第5期998-1003,共6页
The compressive strength developing process and the microstructure of cement-asphalt mortar (CA mortar) were investigated.The fluidity of CA mortar has a great influence on its strength.The optimum value of spread d... The compressive strength developing process and the microstructure of cement-asphalt mortar (CA mortar) were investigated.The fluidity of CA mortar has a great influence on its strength.The optimum value of spread diameter of slump flow test is in the range of 300 to 400 mm.The compressive strength of CA mortar keeps a relatively high growth rate in 56 days and grows slowly afterwards.The residual water of hydration in CA mortar freezes under minus environmental temperature which can lead to a significant reduction of the strength of CA mortar.Increasing A/C retards asphalt emulsion splitting and thus prolongs the setting process of CA mortar.The hydration products of cement form the major structural framework of hardened CA mortar and asphalt is a weak phase in the framework but improves the viscoelastic behavior of CA mortar.Therefore,asphalt emulsion should be used as much as possible on the condition that essential performance criterions of CA mortar are satisfied. 展开更多
关键词 asphalt emulsion compressive strength CA mortar MICROSTRUCTURE
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Filler effect of fine particle sand on the compressive strength of mortar 被引量:1
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作者 Chai Jaturapitakkul Jatuphon Tangpagasit +1 位作者 Sawang Songmue Kraiwood Kiattikomol 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2011年第2期240-246,共7页
The river sand, which is a non-pozzolanic material, was ground into 3 different particle sizes. Portland cement type I was replaced by the ground river sands at 10wt%?40wt% of binder to cast mortar. Compressive stren... The river sand, which is a non-pozzolanic material, was ground into 3 different particle sizes. Portland cement type I was replaced by the ground river sands at 10wt%?40wt% of binder to cast mortar. Compressive strengths of mortar were investigated and the filler effect of different fine particles of sand on the compressive strength of mortar was evaluated. The results show that the compressive strength of mortar contributed from the filler effect of smaller particles is higher than that of the coarser ones. The difference in compressive strength of mortar tends to be greater as the difference in ground river sand fineness increases. The results also suggest that ASTM C618 specification is not practically suitable for specifying pozzolan in concrete since the strength activity index of mortar containing ground river sand (high crystalline phase) with 33.8wt% of particles retained on a 45-μm sieve can pass the strength requirement. 展开更多
关键词 mortar SAND particle size compressive strength HYDRATION
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Effect of Sand Content on Strength and Pore Structure of Cement Mortar
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作者 卜静武 TIAN Zhenghong +1 位作者 ZHENG Shiyu TANG Zilong 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第2期382-390,共9页
The effects of four sand contents on the compressive, flexural and splitting-tensile strength of cement mortars were evaluated. Moreover, we experimentally investigated the pore structure of cement mortar brought abou... The effects of four sand contents on the compressive, flexural and splitting-tensile strength of cement mortars were evaluated. Moreover, we experimentally investigated the pore structure of cement mortar brought about by changing the sand content and water/cement ratio. The changes in the pore structure were quantified by measuring the porosity and pore size distribution obtained by using mercury intrusion porosimetry(MIP) technique. The test results show that the strengths of cement mortar increase with increasing sand content. It is also suggested that the traditional water/cement ratio law can be applied to cement mortar with different sand contents, provided that a slight modification is introduced. Sand content is an important parameter influencing the pore structure of cement mortar. Moreover, there is a good relationship between the pore structure and strength of cement mortar. 展开更多
关键词 sand content strength cement mortar pore structure
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Strength,porosity,and chloride resistance of mortar using the combination of two kinds of pozzolanic materials
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作者 Sumrerng Rukzon Prinya Chindaprasirt 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2013年第8期808-814,共7页
This article presents a study on the resistance to chloride penetration, corrosion, porosity, and strength of mortar containing fine fly ash (FA), ground rice husk-bark ash (RB), and ground bagasse ash (BA). Ord... This article presents a study on the resistance to chloride penetration, corrosion, porosity, and strength of mortar containing fine fly ash (FA), ground rice husk-bark ash (RB), and ground bagasse ash (BA). Ordinary Portland cement (CT) was blended with a single pozzolan and two pozzolans. Strength, porosity, rapid chloride penetration, immersion, and corrosion tests were performed to characterize the mortar. Test results showed that the use of ternary blends of CT, FA, and RB or BA decreased the porosity of the mortar, as compared with binary blended mortar containing CT and RB or BA. The resistance to chloride penetration of the mortar improved substantially with partial replacement of CT with FA, RB, and BA. The use of ternary blends of CT, FA and RB or BA produced the mortar with good strength and resistance to chloride penetration. The resistance to chloride penetration was higher with an increase in the replacement level due to the reduced calcium hydroxide. 展开更多
关键词 mortar pozzolanic materials strength POROSITY chloride penetration agricultural wastes
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Density and Strength of Mortar Made with the Mixture of Wood Ash, Crushed Gneiss and River Sand as Fine Aggregate
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作者 Mambou Ngueyep Luc Leroy Keyangue Tchouata Jules Hermann +3 位作者 Atangana Nkene Elise Rose Ndop Joseph Fotseu Miyo Christian Dupont Ndjaka Jean-Marie Bienvenu 《Journal of Materials Science and Chemical Engineering》 2018年第4期109-120,共12页
The main purpose of this paper is to study the feasibility of using wood bottom ash to partially replace natural fine aggregate or crushed gneiss sand in the manufacturing of mortars. The experiment uses wood ash as f... The main purpose of this paper is to study the feasibility of using wood bottom ash to partially replace natural fine aggregate or crushed gneiss sand in the manufacturing of mortars. The experiment uses wood ash as fine aggregates, which passes through 5 mm sieve, in proportions of 5%, 10%, 15%, 20% and 25% by weight to replace partially river sand and crushed gneiss, and the both sand of the same size as the aggregate respectively. Experimental results show that density of mortar and the compressive strength of mortar decrease globally with the increase in wood ash content. At 56 days, and for all replacements with wood ash, compressive strengths values of mortar obtained with the mixture of wood ash and river sand is greater than 20 MPa, which is not the case for mortar made with crushed gneiss and wood ash. Moreover, for 5% of replacement with wood ash, compressive strengths of mortar obtained with the mixture of wood ash and river sand and the mixture of wood ash and crushed gneiss are respectively 37 MPa and 32 MPa at 56 days. These values satisfied the strength requirements. Hence, 5% replacement of crushed gneiss with wood ash is suggested and could be benefit for mortar. In addition, the replacement of sand by wood ash is preferable with river sand which contains fewer fines than crushed gneiss. The compressive strength of mortar with 25% wood ash + river sand could be suitable. 展开更多
关键词 Wood Bottom ASH River Sand CRUSHED GNEISS mortar COMPRESSIVE strength DENSITY
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Relation between Modulus of Elasticity and Compressive Strength of Ultrahigh-Strength Mortar with Mixed Silicon Carbide as Fine Aggregate
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作者 Research Notes H.Suto Tohoku University, Aoba-Hachiman 5-4-12, Sendai, 980-0871, Japan 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2001年第5期579-580,共2页
Ultrahigh-strength mortar mixed surface-oxidized silicon carbide as a fine aggregate was prepared by means of press-casting followed by curing in an autoclave. The relation between modulus of elssticity up to 111 GPa ... Ultrahigh-strength mortar mixed surface-oxidized silicon carbide as a fine aggregate was prepared by means of press-casting followed by curing in an autoclave. The relation between modulus of elssticity up to 111 GPa and compressive strength up to 360 MPa of mortar mixed silicon carbide was discussed and it was revealed that the contributions of the aggregate hardness and of the interfacial strength between the aggregate and the cement paste on the elasticity of mortar were imporant. 展开更多
关键词 high Relation between Modulus of Elasticity and Compressive strength of Ultrahigh-strength mortar with Mixed Silicon Carbide as Fine Aggregate SIC
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Importance of Sand Grading on the Compressive Strength and Stiffness of Lime Mortar in Small Scale Model Studies
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作者 Abbagana Mohammed Tim G. Hughes Aliyu Abubakar 《Open Journal of Civil Engineering》 2015年第4期372-378,共7页
Mortars provide the continuity required for the stability and exclusion of weather elements in masonry assemblies. But because of the heterogeneity of the mortar, its mechanism of behaviour under different load effect... Mortars provide the continuity required for the stability and exclusion of weather elements in masonry assemblies. But because of the heterogeneity of the mortar, its mechanism of behaviour under different load effects is dependent on the properties of the constituents of the mortar. The aim of paper is to determine the effect sand grading for various cement-sand-lime mortar designations (BS) and strength classes (EC) on the compressive strength and stiffness of mortar. Two silica sands;HST 95 and HST60 were used to make mortars in three strength classes: M2, M4 and M6, corresponding to mortar designations iv, iii and ii respectively. The results show that mortar made with the HST60 sand (coarser grading) usually resulted in mortar with a higher compressive strength and stiffness. The One Way ANOVA analysis of both compressive strength and stiffness at a significance level of 5% on the effect of sand grading on the two parameters also shows that they are both significant. There is also strong evidence of a linear correlation between the stiffness and compressive strength. The results indicate that in order to replicate full scale behaviour of masonry at model scales, the grading of fine aggregate in the models should be similar so as to properly model full scale behavior. 展开更多
关键词 Lime-mortar SAND GRADING strength STIFFNESS MASONRY Model
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Strength and chloride resistance of blended Portland cement mortar containing palm oil fuel ash and fly ash 被引量:4
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作者 Sumrerng Rukzon Prinya Chindaprasirt 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2009年第4期475-481,共7页
This paper presented a study on the strength and chloride resistance of mortars made with ternary blends of ordinary Portland cement (OPC), ground palm oil fuel ash (POA), and classified fly ash (FA). The mortar... This paper presented a study on the strength and chloride resistance of mortars made with ternary blends of ordinary Portland cement (OPC), ground palm oil fuel ash (POA), and classified fly ash (FA). The mortar mixtures were made with Portland cement type I containing 0-40wt% FA and POA. FA and POA with 1wt%-3wt% retained on a sieve No.325 were used. The compressive strength and rapid chloride penetration depth of mortars were determined. The results reveal that the use of ternary blended cements produces good strength mortars. The use of the blend of FA and POA also produces high strength mortars and excellent resistance to chloride penetration owing to the synergic effect of FA and POA. A mathematical analysis and two-parameter polynomial model were presented to predict the compressive strength. The mathematical model correlated well with the experimental results. The computer 3-D graphics of strength of the ternary blended mortars were also constructed and could be used to aid the understanding and the proportioning of the blended system. 展开更多
关键词 compressive strength chloride resistance fly ash palm oil fuel ash mortar
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Experimental Study of the Physical and Mechanical Behaviour of Mortar Formulations with Fine Sands of Recycled Glass
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作者 Apedjinou Dodji Kplolanyo Samah Essoavama Ouro-Djobo +2 位作者 Amey Kossi Bollanigni Kassegne Komlan Assogba Tiem Sonnou 《Open Journal of Civil Engineering》 2023年第2期252-262,共11页
This work is part of an experimental contribution approach to the study of the incorporation of glass sand from the grinding of recycled glass waste in cement mortars and its influence on the physical and mechanical b... This work is part of an experimental contribution approach to the study of the incorporation of glass sand from the grinding of recycled glass waste in cement mortars and its influence on the physical and mechanical behavior of semi-rich mortars without adjuvants. For this purpose, after a physical characterization of the sands, eight (08) formulations of mortars based on cement CEM II B/L 32.5R and fine sands (0/2) of glass at mass contents of 0%, 10%, 20%, 30%, 40%, 50%, 75% and 100% of the silty sand (0/2) were made respectively to three (03) types of fine glass sand (white, brown, green) with water dosages on cement (W/C) of 0.50, 0.45, 0.40. The results obtained show that the fine sands of recycled glass have a higher water absorption than the silty sand and the physical properties of the mortars prepared are affected by the increase in the glass content. The mechanical performances are obtained for the ratio W/C = 0.50 and the formulation of glass mortars for an optimal compressive strength superior to glass-free mortar requires a substitution of 10% for fine white glass sand, 20% for sand fine green glass and 75% for fine brown glass sand. The comparative study between these different compositions of fine glass sand mortars shows that the mechanical performances of fine brown glass sand are better than other glass sands but generally remain inferior to the control mortar based on natural silty sand. 展开更多
关键词 Glass Waste Glass Sand mortar Compression strength Bending strength Absorption Rate
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硅灰及矿渣粉对大掺量粉煤灰砂浆力学性能的影响及机理研究 被引量:1
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作者 刘扬 王家理 +3 位作者 罗冬 袁和平 鲁乃唯 王柏文 《硅酸盐通报》 CAS 北大核心 2024年第7期2584-2594,共11页
以硅灰和矿渣粉(GGBS)为辅助胶凝材料,使用聚羧酸高性能减水剂,分别研究了硅灰和GGBS对大掺量粉煤灰砂浆抗压强度的影响。通过压汞测试(MIP)、扫描电子显微镜(SEM)以及X射线衍射(XRD)等方法对制备试件的孔结构、微观产物、物相组成进行... 以硅灰和矿渣粉(GGBS)为辅助胶凝材料,使用聚羧酸高性能减水剂,分别研究了硅灰和GGBS对大掺量粉煤灰砂浆抗压强度的影响。通过压汞测试(MIP)、扫描电子显微镜(SEM)以及X射线衍射(XRD)等方法对制备试件的孔结构、微观产物、物相组成进行分析,得到了硅灰和GGBS影响大掺量粉煤灰砂浆强度的机理。结果表明:单掺硅灰的大掺量粉煤灰砂浆的抗压强度随着硅灰含量增加先增大后减小,单掺GGBS的规律与硅灰类似;复掺硅灰和矿渣时,砂浆的强度较其他同龄期组均有一定的提高,二者表现出良好的协同作用;无论是单掺还是复掺,硅灰和GGBS都对大掺量粉煤灰砂浆强度有良好的提升作用。砂浆试件总孔隙率和大孔占比与抗压强度总体呈负相关,强度越高的砂浆试件微观结构越致密,但相比于总孔隙率,毛细孔和大孔占比表现出与抗压强度更好的相关性。当硅灰和GGBS质量分数分别为8%和6%时,砂浆28 d强度最大,为88.05 MPa。 展开更多
关键词 大掺量粉煤灰砂浆 硅灰 矿渣粉 抗压强度 微观结构
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脱硫石膏基自流平砂浆的制备与性能研究
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作者 戴民 丁笠轩 赵明宇 《沈阳建筑大学学报(自然科学版)》 CAS 北大核心 2024年第5期938-944,共7页
目的以脱硫石膏为主要胶凝材料,通过优化材料组成制备出主要性能满足相关标准要求的石膏基自流平砂浆。方法将脱硫石膏、水泥、细砂、减水剂和缓凝剂等组分按不同比例混合,以力学性能、30 min流动度为考查指标,设计单因素试验,探讨各组... 目的以脱硫石膏为主要胶凝材料,通过优化材料组成制备出主要性能满足相关标准要求的石膏基自流平砂浆。方法将脱硫石膏、水泥、细砂、减水剂和缓凝剂等组分按不同比例混合,以力学性能、30 min流动度为考查指标,设计单因素试验,探讨各组分用量对自流平砂浆性能的影响。结果随水灰比的增加,脱硫石膏净浆流动度增加,力学性能降低;减水剂掺量增加会使脱硫石膏净浆的30 min流动度提高,力学性能降低;掺入普通硅酸盐水泥能明显提高净浆30 min流动度以及抗折、抗压强度;随细砂掺量的增加,脱硫石膏基自流平砂浆的30 min流动度降低,抗折强度明显降低,抗压强度在细砂掺量为40%后明显降低。结论经优化后配制出的脱硫石膏基自流平砂浆的力学性能和30 min流动度满足《石膏基自流平砂浆》要求。 展开更多
关键词 脱硫石膏 自流平砂浆 流动度 强度
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3D打印再生砂浆早期流变性能及结构经时演化研究
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作者 刘超 蒙毅升 +1 位作者 武怡文 刘化威 《材料导报》 EI CAS CSCD 北大核心 2024年第9期118-125,共8页
为深入探究再生砂浆在3D打印技术中的适用性,对不同取代率的再生砂浆开展研究,分析了再生砂浆的流/触变性在早期阶段的发展过程,采用数字图像技术对静载作用下3D打印试件的变形进行收集分析。结果表明:随着水化反应的进行,再生砂浆呈现... 为深入探究再生砂浆在3D打印技术中的适用性,对不同取代率的再生砂浆开展研究,分析了再生砂浆的流/触变性在早期阶段的发展过程,采用数字图像技术对静载作用下3D打印试件的变形进行收集分析。结果表明:随着水化反应的进行,再生砂浆呈现较快的静态屈服应力和触变环面积的增长趋势,其20 min静态屈服应力为天然砂浆的1.47倍,表现出更好的可建造性。在荷载作用下再生砂浆打印试件的竖向突变高度损失和徐变位移明显较小,约为天然砂浆打印试件的1/2。根据再生砂表观特点揭示了水化过程中再生砂浆流/触变性的演化机理,从材料性能和3D打印试件结构空隙方面对3D打印试件在静载作用下的变形进行分析,为再生砂浆在3D打印中的使用提供理论支撑。 展开更多
关键词 3D打印 再生砂浆 早期性能 流变性 强度演化
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钢纤维-海泡石纤维优化铁尾矿砂-石英砂混合砂浆性能试验研究
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作者 李九苏 易俊波 《化工矿物与加工》 CAS 2024年第8期9-16,共8页
为了在保证经济性的同时改善铁尾矿砂-石英砂混合砂浆的性能,选用钢纤维、海泡石纤维优化混合砂浆,研究了钢纤维、海泡石纤维单掺和以不同比例混掺对混合砂浆工作性能、力学性能和自然干燥收缩率的影响。结果表明,在单掺情况下,海泡石... 为了在保证经济性的同时改善铁尾矿砂-石英砂混合砂浆的性能,选用钢纤维、海泡石纤维优化混合砂浆,研究了钢纤维、海泡石纤维单掺和以不同比例混掺对混合砂浆工作性能、力学性能和自然干燥收缩率的影响。结果表明,在单掺情况下,海泡石纤维对流动性的负面影响高于钢纤维,两种纤维分别以合适掺量掺入混合砂浆中,钢纤维对抗折强度和28 d自然干燥收缩率的改善效果优于海泡石纤维,而海泡石纤维对抗压强度的改善效果更佳;钢纤维-海泡石纤维以0.50%-1.0%和0.75%-1.0%组合混掺对矿浆力学性能和干燥收缩改善效果最佳。从性能改善效果和经济性角度综合考虑,确定了最优纤维掺量组合,即钢纤维、海泡石纤维掺量分别为0.50%、1.0%。在此掺量组合下,混合砂浆3 d、7 d和28 d抗折强度分别提升了15.8%、13.0%和12.5%,混合砂浆3 d、7 d和28 d抗压强度分别提升了16.2%、14.7%和13.9%,28 d自然干燥收缩率降低了32.8%,且经济性良好,每吨混合砂浆仅增加28.8元左右的成本。 展开更多
关键词 钢纤维 海泡石纤维 铁尾矿砂 石英砂 水泥砂浆 抗折强度 抗压强度
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硫酸镁侵蚀作用下高流态水泥砂浆的早期强度劣化特征
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作者 王健 李敏 +3 位作者 陈净纯 赵泽栋 赵洪波 任皎龙 《山东理工大学学报(自然科学版)》 CAS 2024年第3期42-50,共9页
高流态早强(HFES)水泥砂浆被广泛应用于土木工程的各个领域。在复杂的工程环境下,HFES水泥砂浆的硫酸盐侵蚀不容忽视。尽管硫酸盐对水泥基材料性能的影响已有一些研究,但HFES水泥砂浆与传统水泥基材料相比有明显不同,其在硫酸盐侵蚀情... 高流态早强(HFES)水泥砂浆被广泛应用于土木工程的各个领域。在复杂的工程环境下,HFES水泥砂浆的硫酸盐侵蚀不容忽视。尽管硫酸盐对水泥基材料性能的影响已有一些研究,但HFES水泥砂浆与传统水泥基材料相比有明显不同,其在硫酸盐侵蚀情况下的劣化机制尚不明确。本文研究了不同硫酸镁溶液浓度和侵蚀时间下HFES水泥砂浆的早期抗折和抗压强度,通过扫描电镜(SEM)、X射线衍射(XRD)和差示扫描量热仪(DSC)测试,分析了硫酸镁溶液浓度和侵蚀次数对HFES水泥砂浆微观结构和水化产物的影响,揭示了硫酸镁对HFES水泥砂浆早期强度形成的影响机制。 展开更多
关键词 高流态水泥砂浆 劣化特征 早期强度 硫酸镁 侵蚀
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不同环境溶液下高吸水树脂对水泥基材料的裂缝修复性 被引量:1
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作者 杨世界 张士萍 +1 位作者 牛龙龙 张守卫 《硅酸盐通报》 CAS 北大核心 2024年第6期2012-2021,共10页
混凝土开裂及修复一直是工程界关注的重点问题,高吸水树脂(SAP)具有一定的裂缝自愈合功能。本文测试了不同环境溶液(NaOH、NaCl和蒸馏水)下SAP的吸液性能,以开裂试件的抗压强度恢复率、不同裂缝宽度(0.1、0.2 mm)的自愈合率以及裂缝填... 混凝土开裂及修复一直是工程界关注的重点问题,高吸水树脂(SAP)具有一定的裂缝自愈合功能。本文测试了不同环境溶液(NaOH、NaCl和蒸馏水)下SAP的吸液性能,以开裂试件的抗压强度恢复率、不同裂缝宽度(0.1、0.2 mm)的自愈合率以及裂缝填充状态为修复指标,分析了不同质量分数(0%、0.5%、1.0%)的SAP在不同环境溶液下对开裂砂浆试件的修复效果。结果表明:SAP在不同环境溶液下的吸液倍率呈先快速增加后缓慢趋于稳定的变化规律,其中SAP在NaOH环境溶液下的吸液倍率最高;SAP的掺入一定程度上提升了开裂砂浆试件在不同环境溶液下的抗压强度恢复率,其中掺入0.5%SAP的试件在NaOH环境溶液修复28 d的抗压强度恢复率最高,高出基准组17%;SAP的掺入提高了不同裂缝宽度的砂浆试件在不同环境溶液下的自愈合性能,随着SAP含量增加,0.2 mm裂缝宽度的砂浆试件在NaOH环境溶液修复28 d的自愈合率显著高于蒸馏水和NaCl溶液,掺入1.0%SAP的试件在NaOH环境溶液下的自愈合率达90%;SAP协同水化产物封堵裂缝口,提高了水泥砂浆的耐久性。 展开更多
关键词 环境溶液 高吸水树脂 砂浆 裂缝 抗压强度 自愈合
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不同来源垃圾焚烧炉渣的理化性质及再生砂浆的强度变异性
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作者 陈春红 张海燕 +2 位作者 张勇刚 唐婷 卜继斌 《华南理工大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第10期87-100,共14页
城市生活垃圾炉渣(IBA)随着垃圾的组成、焚烧工艺和贮存条件等不同而产生较大的异质性,一批再生混凝土(砂浆)有效的配合比对另一批可能无效,导致再生混凝土(砂浆)性能产生较大的离散性,使其应用受到限制。为探究不同来源垃圾焚烧炉渣的... 城市生活垃圾炉渣(IBA)随着垃圾的组成、焚烧工艺和贮存条件等不同而产生较大的异质性,一批再生混凝土(砂浆)有效的配合比对另一批可能无效,导致再生混凝土(砂浆)性能产生较大的离散性,使其应用受到限制。为探究不同来源垃圾焚烧炉渣的异质性及再生砂浆的强度变异性,文中收集了不同焚烧厂以及不同月份来源的共计14批次IBA样品,测试了不同来源IBA试样的理化性质以及再生砂浆的工作性能和抗压、劈裂抗拉强度,统计分析了IBA再生砂浆的强度变异性水平。结果表明:IBA的压碎指标、空隙率、硫化物和氯化物含量均超出了规范关于再生细骨料的要求,不同来源的IBA存在明显的异质性;单一焚烧厂不同月份的IBA以50%取代率配制M_(2)0强度等级以下的再生水泥砂浆时,强度相较于天然骨料砂浆降低不显著,且强度变异性与普通再生骨料混凝土相当,标准差也低于规范建议值,但用于M_(2)0以上再生砂浆时强度降低较多(约23%~32%);两座不同焚烧厂的IBA再生砂浆的抗压强度变异系数较高,建议不同焚烧厂来源的IBA再生砂浆不混合使用。 展开更多
关键词 垃圾焚烧炉渣 异质性 再生砂浆 强度 变异性
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微波照射下附着砂浆对再生混凝土粗骨料强度的影响 被引量:1
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作者 邵珠山 王维涛 +2 位作者 赵冬 袁媛 郭轩 《材料科学与工程学报》 CAS CSCD 北大核心 2024年第1期27-34,共8页
微波照射回收废弃混凝土中的粗骨料是一种高效、节能、环保的混凝土再资源化技术。粗骨料表面附着砂浆耗散的微波能量对于回收粗骨料的质量有显著影响。本实验选取了两种常见的粗骨料,花岗岩和玄武岩,制成表面包裹均匀厚度砂浆的试样进... 微波照射回收废弃混凝土中的粗骨料是一种高效、节能、环保的混凝土再资源化技术。粗骨料表面附着砂浆耗散的微波能量对于回收粗骨料的质量有显著影响。本实验选取了两种常见的粗骨料,花岗岩和玄武岩,制成表面包裹均匀厚度砂浆的试样进行微波加热试验,研究了不同的砂浆厚度和含水率下试样表面的温度变化,并对微波照射后砂浆失水特性、裂纹扩展及破坏特征进行了分析。微波加热结束后剔除粗骨料表面剩余的附着砂浆,选取形状完整未发生熔融的粗骨料进行单轴抗压强度测试,研究包裹砂浆对微波照射粗骨料强度折减的影响。结果表明:微波照射后花岗岩和玄武岩骨料的强度随粘结砂浆含水量的增加而增加;微波照射后花岗岩骨料强度随黏附砂浆厚度增加而增加,玄武岩骨料强度随黏附砂浆厚度增加呈下降趋势。与厚度相比,砂浆的含水率对微波加热后粗骨料的强度影响更大。 展开更多
关键词 混凝土 微波加热 砂浆厚度 含水率 强度弱化
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低水温下大流动性环氧树脂水下修补砂浆的制备
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作者 易旭涛 刘军 +2 位作者 相福壮 雷英强 丁建彤 《水利水电技术(中英文)》 北大核心 2024年第S01期422-428,共7页
水电站泄水建筑物水下修补施工对环氧树脂修补砂浆的流动性有更高要求,特别是低水温环境下仍然具有大流动性、可以自流平。选用Dinger-Funk方程优化填料粒径分布,优选粒径分布指数为0.4、紧密堆积空隙率仅0.251%的填料,将环氧树脂砂浆... 水电站泄水建筑物水下修补施工对环氧树脂修补砂浆的流动性有更高要求,特别是低水温环境下仍然具有大流动性、可以自流平。选用Dinger-Funk方程优化填料粒径分布,优选粒径分布指数为0.4、紧密堆积空隙率仅0.251%的填料,将环氧树脂砂浆流动度提高到18.3 cm;增加稀释剂用量,由20份增加到40份,5℃下环氧树脂基液黏度显著降低73%,砂浆流动度由13.5 cm提高到17.0 cm;为了抵消稀释剂掺量增加和低温所导致的砂浆强度降低,添加30份三环氧官能团树脂增加树脂基液活性,5℃下砂浆的28 d水下粘结强度和抗压强度分别为2.9 MPa、88 MPa,相比未添加的分别提高142%、115%。 展开更多
关键词 水下修补 环氧树脂砂浆 低温 流动度 水下强度
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