實驗結果顯示，在發泡劑用量0.5%、0.9%、1.3%，水泥/污泥灰用量比例為40：60、30：70、20：80，以及水固比為0.5、0.6、0.7、0.8等配比條件下，污泥灰發泡輕質混凝土之密度與抗壓強度皆能達到中國國家標準CNS 13480「高壓蒸汽養護輕質氣泡混凝土磚」之比重1.2以下、抗壓強度2.5MPa之水準；污泥灰發泡輕質混凝土為多孔洞結構，其毛細管孔體積達84.7~96.4%，傳導率介於0.0845~0.1024W/m.K，僅一般混凝土之1/10~1/20，且低於一般市售ALC製品；污泥灰發泡輕質混凝土經1093℃焚燒後，因燒結作用使其密度與抗壓強度增加，當污泥灰用量增加其強度提升幅度越大，但體積收縮率反而增加，此現象需待改善。因此，利用污泥灰渣與廢五金粉常溫製造發泡輕質混凝土，不但符合減量、資源化與省能等功能，同時能提供質輕且經濟的環保建材。

The results showed that under a mix design using 0.5%, 0.9% and 1.3% vesicant, with cement to sludge ash ratios ranging from 40：60, 30：70 and 20：80, and a water-to-solid ratio from 0.5, 0.6,0.7, and 0.8, the resultant sludge-ash-lightweight- concrete satisfied, in terms of density and compressive strength, the standards of CNS 13480 of which the requirements for specific gravity and compressive strength are <1.2 and 2.5MPa., respectively. The capillary pore volume of the resultant sludge—ash-lightweight-concrete fell in the range of 84.7%~96.4%; the thermal conductivity of the resultant concrete ranged from 0.0845~0.1024W/m.K, a value half of that of the ordinary concrete and lower than that of commercial ALC products. Heating test at 1093℃ showed that an increase in the density and compressive strength of the tested concrete specimen took place concurrently with the sintering of the concrete. Moreover, increasing the amount of sludge ash tended to increase the compressive strength of the concrete to some extent; however, a positive correlation between the degree of strength development and volumetric shrinkage suggested there was still room for further improvement. In conclusion, making blowing lightweight concrete with sludge ash and waste-metal power not only satisfies the requirement for waste reduction, recycling and energy conservation but also offers a light, economical and environment-friendly building material.

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