Effects of Wood Ash and Waste Glass Powder on Properties of Concrete in Terms of Workability and Compressive Strength in Jaresh City

The potential for using fly ash as a supplementary cementing material in concrete has been known almost since the beginning of the previous century. Fly ash was used as a supplementary cementing material (SCM) in the production of Portland cement concrete. A supplementary cementing material, when used in conjunction with Portland cement, contributes to the properties of the hardened concrete through hydraulic or pozzolanic activity, or both. In this study, the fly ash and waste glass powder were used in concrete blocks to study the improvement of concrete in terms of workability and strength. Therefore, an experimental study will be conducted to measure the engineering properties of cured concrete. In this research, local raw material from Jaresh area was used.

玻璃粉对粉煤灰复合硬化水泥浆氯离子结合能力影响

就玻璃粉对粉煤灰复合硬化水泥浆氯离子结合能力影响进行了研究。首先对0~70%粉煤灰取代量的复合硬化水泥浆在90 d内的氯离子结合性能进行了研究。其次,采用玻璃粉与粉煤灰1∶4的比例以二者混合粉体替代水泥,玻璃粉替代量为0~8%,对玻璃粉-粉煤灰-水泥体系硬化浆体氯离子固定能力进行了研究。并通过XRD物相分析对氯离子结合机理进行了分析。结果表明,在粉煤灰复合水泥硬化浆体中,随粉煤灰对水泥取代量的增大,在不同龄期时,氯离子结合量出现极大值,且该极大值随龄期增长向小取代量方向移动。玻璃粉在粉煤灰复合水泥浆中的加入,有使硬化水泥浆氯离子结合能力降低的趋势。但根据XRD的结果,无论是粉煤灰复合水泥浆还是玻璃粉和粉煤灰复掺的硬化水泥浆,其Friedel盐含量和组成及龄期的关系均和氯离子结合量和同类因素的关系不一致。推测物理吸附对上述两种体系氯离子结合量随组成与龄期变化的规律有更大的影响。

三乙醇胺对含玻璃粉复合水泥浆氯离子结合能力的影响

研究了三乙醇胺(TEA)对玻璃粉/粉煤灰/普通硅酸盐复合水泥浆氯离子结合能力的影响,并通过XRD、扫描电镜和热重分析对其机理进行了分析。试验结果表明,在玻璃粉复掺粉煤灰水泥浆中掺入TEA可以提高其7、14、28 d的氯离子结合能力,TEA的掺量为相对于胶凝材料质量的0.025%时,氯离子结合能力与对照组相比有显著的增长,随着TEA掺量继续增加至0.1%,氯离子结合量增幅减缓。XRD分析结果表明,TEA在7、14 d龄期时,掺量达到0.1%具有促进F盐形成的作用。TEA对复掺玻璃粉和粉煤灰水泥浆的氯离子结合能力的提高作用主要由物理结合能力的提高所导致。TEA具有破坏水泥浆中堆垛层状氢氧化钙晶体形成的作用,更加分散的氢氧化钙的分布有利于CSH凝胶的形成,可起到增大水泥浆氯离子物理结合能力的作用。