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以建筑垃圾粉料、再生细骨料、电石渣、石灰为基本原料,引入改性剂S,采用蒸压养护工艺,制备承重墙体砖。结果表明:在合理的配料和养护工艺条件下,采用建筑垃圾粉料可完全取代水泥、石灰等胶凝材料,而再生骨料可全部取代砂粒;其中建筑垃圾粉料、再生骨料总用量可达到70%~80%,固体废弃物总用量达95%,制备的墙体砖强度达MU15级。 相似文献
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Mu15粉煤灰蒸压砖的配合比研究 总被引:1,自引:1,他引:0
建筑垃圾危害社会环境,须合理利用.研究了以建筑垃圾为骨料,利用粉煤灰等工业废渣制Mu15蒸压砖的最佳配合比.通过试验,确定3种体系蒸压砖的最佳配合比:建筑垃圾-粉煤灰-石灰体系, 建筑垃圾65%,粉煤灰25%,生石灰8%;建筑垃圾-粉煤灰-电石渣体系,建筑垃圾 63%,粉煤灰25%, 电石渣10%;建筑垃圾-粉煤灰-石灰-水泥体系,建筑垃圾 65%,粉煤灰25%,生石灰5%,水泥3%. 相似文献
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英慧 《建筑砌块与砌块建筑》2012,(6):50-51,29
通过对表面变形蒸压粉煤灰砖及普通蒸压粉煤灰实心砖进行的抗压强度和抗折强度的试验,对比得出两种砖的抗压强度基本一致,而表面变形砖的抗折强度仅为普通蒸压粉煤灰砖的52%。证明砖表面变形导致抗折强度减小。建议改进砖型或取消凹凸槽以减小应力集中。本文参考试验数据,给出强度等级为MU15蒸压粉煤灰砖的建议折压比限值为0.25。试验结果为辽宁地方标准《蒸压粉煤灰砖建筑技术规范》的编制提供了参考依据。 相似文献
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利用高硫石油焦渣和建筑垃圾制备再生砖 总被引:3,自引:0,他引:3
建筑垃圾和工业废渣危害自然环境,需合理利用.研究了以建筑垃圾为骨料,利用高硫石油焦渣、粉煤灰等工业废渣制备再生砖.通过正交试验分析,给出了最佳配合比:建筑垃圾骨料65%、高硫石油焦渣20%、粉煤灰13%、激发剂2%.并在此基础之上,研究了高硫石油焦渣细度对再生砖抗压强度的影响. 相似文献
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进行了利用建筑垃圾制备再生混凝土路面砖的试验研究,结果表明再生混凝土路面砖抗压强度与水泥用量正相关,适宜水泥掺量为20%;底层配合比中适宜水灰比为0.4,再生粗骨料适宜比例为20%。当底层配合比为水泥:再生骨料A:再生骨料B:水=1:1:4:0.40时,再生混凝土路面砖强度等级为CC40。 相似文献
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按照《砌墙砖试验方法》(GB/T2542-2003)对蒸压粉煤灰砖进行砖的含水率、抗压强度、抗折强度试验。确定蒸压粉煤灰砖的基本力学指标,为编制辽宁省地方标准《蒸压粉煤灰砖建筑技术规范》提供试验依据。结果表明,蒸压粉煤灰砖含水率为2.96%,抗压强度为11.46MPa,抗折强度为1.68MPa,在实际工程上可替代普通烧结砖使用。 相似文献
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《Construction and Building Materials》2006,20(8):569-577
Clay brick generated from construction sites is usually delivered to landfills for disposal. With the limited landfill space in Hong Kong, there is an immediate need to explore the possible use of crushed clay brick as a new civil engineering material. In Hong Kong, government specifications promote the use of paving blocks made with 70–100% recycled concrete aggregate in order to facilitate the recycling of construction and demolition (C&D) waste. This paper presents a recent study at the Hong Kong Polytechnic University on the investigation of blending recycled concrete aggregate and crushed clay brick as aggregates in the production of paving blocks.The results indicated that the incorporation of crushed clay brick reduced the density, compressive strength and tensile strength of the paving blocks. Due to the high water absorption of crushed clay brick particles, the water absorption of the resulting paving blocks were higher than that of the paving blocks that did not incorporate crushed clay brick. Although it was found that crushed clay brick impaired the quality of the resulting paving blocks to a certain extent, the paving blocks using 50% crushed clay brick met the minimum requirements specified by AS/NZS 4455 and ETWB of Hong Kong (Grade B) for pedestrian areas. Furthermore, it was feasible to produce paving blocks prepared with 25% crushed clay brick that satisfied the compressive strength requirement for paving blocks (Grade B) prescribed by ETWB of Hong Kong for trafficked area. 相似文献
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为了研究不同块型非烧结多孔砖砌体的抗压强度,通过试验研究,对Tasuji-Slate-Nilson破坏准则进行修正后,结合ANSYS有限元分析,得到了分析各种块型砌体抗压强度的理论模型。用该模型对各种块型砖砌体分析结果表明,块体原材料、几何尺寸和孔洞率对砌体抗压强度有明显的影响。在普通砖砌体抗压强度计算公式基础上,引入块型影响系数,得到了各种块型非烧结多孔砖砌体抗压强度计算公式。通过与493个蒸压灰砂多孔砖砌体、144个混凝土多孔砖砌体及30个蒸压粉煤灰多孔砖砌体抗压试验结果对比表明,计算公式的计算精度良好。 相似文献
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This paper reports an experimental study that aimed to investigate the effects of recycled clay brick, used as a part of fine aggregate, on mortar durability. The brick, in crushed form, was from a local brick manufacturer that salvages its off-standard products. It was used to replace 10% and 20% (by weight) of the river sand in mortar. Effects of the brick replacement on the mortar flow, compressive strength, shrinkage, freeze–thaw resistance, and alkali–silica reaction potential were investigated. The results showed that as the brick replacement level increased, the mortar flowability reduced. The 10% and 20% brick replacements had no negative effect on the mortar compressive strength and very limited effect on the mortar shrinkage. The freeze–thaw resistance of the mortar was improved by the brick replacement. However, the use of crushed brick as aggregate appeared not to reduce potential alkali–silica reaction. The microscopy study revealed the alkali–silica reaction product and associated cracking in the mortar. Additional study indicated that the brick aggregate used in the study had pessimum proportion, 30%, for the alkali–silica reaction expansion. 相似文献
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试验研究了简单破碎再生粗骨料和颗粒整形再生粗骨料40%,70%和100%取代天然骨料,对混凝土工作性和强度的影响.结果表明:在相同取代率情况下,简单破碎再生粗骨料混凝土用水量较多、强度较差,颗粒整形再生粗骨料混凝土的用水量比简单破碎再生粗骨料混凝土显著降低,强度明显提高;随着取代率的增加,简单破碎再生混凝土的用水量增加较多、强度下降较大,而颗粒整形再生混凝土用水量略有增加且强度稍有降低,但是完全取代时的用水量和强度仍接近天然粗骨料混凝土. 相似文献
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DP型烧结多孔黏土砖的孔型和孔洞率相比普通多孔砖有所变化,为研究对应砌体的力学性能与变形指标,对DP型烧结多孔黏土砖砌体进行了受压和受剪试验,根据试验结果分析了该类砌体受压、受剪的破坏机理和破坏特征。结果表明,大开孔率烧结多孔黏土砖砌体受压破坏时沿竖向形成上下通缝,开孔率较大的DP1型烧结多孔砖砌体的抗压强度比开孔率较小的DP2型烧结多孔黏土砖砌体的低,且变异系数大;砌体破坏形式包括单剪破坏、双剪破坏和砖块压坏三种,DP1型烧结多孔砖砌体抗剪强度比DP2型烧结多孔黏土砖砌体的高。采用最小二乘法对规范公式进行修正,建立了DP型烧结多孔黏土砖砌体抗压和抗剪强度平均值的计算式,计算结果与试验结果吻合较好。计算得到DP型烧结多孔黏土砖砌体抗压和抗剪强度设计值,并根据已有受压本构模型,建立了该类砖砌体受压应力-应变关系式和弹性模量计算式,计算值与试验结果吻合较好。 相似文献