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    山东青石的抗冻性耐热性以及导热性
    作者: 时间:2020-05-11 09:05:59 来源:原创


    1.抗冻(dong)性


    山东青石(shi)石(shi)材的(de)(de)抗(kang)冻(dong)(dong)(dong)(dong)性(xing)(xing)是(shi)(shi)指(zhi)其(qi)抵抗(kang)冻(dong)(dong)(dong)(dong)融(rong)破坏(huai)的(de)(de)能力。其(qi)值是(shi)(shi)根据石(shi)材在水饱和状态下按规范要求所能经受(shou)的(de)(de)冻(dong)(dong)(dong)(dong)融(rong)循环次数表示。能经受(shou)的(de)(de)冻(dong)(dong)(dong)(dong)融(rong)循环次数越多,则抗(kang)冻(dong)(dong)(dong)(dong)性(xing)(xing)越高。石(shi)材的(de)(de)抗(kang)冻(dong)(dong)(dong)(dong)性(xing)(xing)与吸水率有密切关系,吸水率低的(de)(de)石(shi)材其(qi)抗(kang)冻(dong)(dong)(dong)(dong)性(xing)(xing)好。吸水率不小于0.5%时应进行抗(kang)冻(dong)(dong)(dong)(dong)性(xing)(xing)检(jian)测,经25次冻(dong)(dong)(dong)(dong)融(rong)循环后强度损失(shi)不大(da)于25%的(de)(de)为合格。


    2.耐热(re)性


    山东(dong)青石(shi)石(shi)材的耐(nai)热性与其(qi)化(hua)学成分及矿物质组成有关。石(shi)材的热胀(zhang)(zhang)冷(leng)缩,体积变化(hua)产生(sheng)内应力或(huo)因组成矿物发生(sheng)分解和变质等导致结构破坏。如(ru)花岗(gang)岩,当温度(du)达到700°C以上时,其(qi)中的石(shi)英(ying)受热发生(sheng)膨(peng)胀(zhang)(zhang),强度(du)迅速下(xia)降。


    3.导热(re)性


    山东(dong)青石石材(cai)的导(dao)热性(xing)主(zhu)要(yao)与其表观密度和结(jie)构状态(tai)有关。重质石材(cai)的热导(dao)率可达2.91~3.49W/m·K;轻质石材(cai)的热导(dao)率则在0.23~0.70W/m·K。相(xiang)同成(cheng)分的石材(cai),玻(bo)璃态(tai)比结(jie)晶态(tai)的热导(dao)率小,封闭(bi)孔隙的导(dao)热性(xing)差。



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