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首页> 外文会议>RILEM Proceedings PRO 40; International RILEM Conference on the Use of Recycled Materials in Buildings and Structures vol.2; 20041108-11; Barcelona(ES) >STRENGTH DEVELOPMENT AND DRYING SHRINKAGE OF STEAM-CURED CONCRETE CONTAINING PFBC COAL ASH
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STRENGTH DEVELOPMENT AND DRYING SHRINKAGE OF STEAM-CURED CONCRETE CONTAINING PFBC COAL ASH

机译：含PFBC粉煤灰的蒸汽固化混凝土的强度发展和干缩

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摘要

A pressurized fluidized bed combustion (PFBC) thermal power plant has been constructed in Japan in order to enhance power-generating efficiency as well as to reduce environmental load. Coal ash produced from this type of power plant (PFBC coal ash) contains large amounts of CaO, SO_3, and small amount of SiO_2. In order to utilize PFBC coal ash to structural concrete like prefabricated concrete products as an mineral admixture, strength development and drying shrinkage of concrete containing PFBC coal ash (PFBC concrete) cured by steam of 60℃ are investigated experimentally relating its microstructure and hydrated products. Water to binder (W/B) ratios of concrete are 0.30 and 0.45, and their replacement ratios of the ash are 0.0 and 0.3, respectively. The compressive strength of PFBC concrete were 20% lower than that of normal concrete independent of W/B at early ages. However, the former exceeded the latter at and after 28 days for W/B = 0.30 and reached almost the same strength as the latter at 1 year for W/B = 0.45. One of the reasons for these results might be explained by production of ettringite which reduce pore volume in the size over 0.1 μm in diameter, especially in case of W/B = 0.30 as pozzolanic reaction was not significantly observed. Drying shrinkage of PFBC concrete was comparable with that of normal concrete, while measurement in full sized hollow girder without arrangement of steel bars showed the contribution of PFBC coal ash to reducing autogenous shrinkage.
机译：日本已经建造了加压流化床燃烧（PFBC）热电厂，以提高发电效率并减少环境负荷。这种发电厂产生的煤灰（PFBC煤灰）包含大量的CaO，SO_3和少量的SiO_2。为了将PFBC粉煤灰作为预制混凝土产品作为矿物掺合料用于结构混凝土，对60℃蒸汽固化的PFBC粉煤灰的混凝土的强度发展和干燥收缩进行了实验研究，探讨了其微观结构和水合产物的关系。混凝土的水与粘结剂（W / B）比为0.30和0.45，灰分的替代比分别为0.0和0.3。早于W / B，PFBC混凝土的抗压强度比普通混凝土低20％。但是，前者在W / B = 0.30时和之后28天超过后者，并且在W / B = 0.45时达到与后者在1年时几乎相同的强度。这些结果的原因之一可以由钙矾石的产生来解释，该钙矾石减少了直径超过0.1μm的尺寸的孔体积，特别是在W / B = 0.30的情况下，因为没有明显观察到火山灰反应。 PFBC混凝土的干缩与普通混凝土相当，而在没有布置钢筋的全尺寸空心梁中进行的测量表明，PFBC粉煤灰有助于减少自发收缩。

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