Acid tolerance is one of the main cariogenecities of Streptococcus mutans, especially its acid tolerance response, is regarded as a significant factor for its life and cariogenecity.
耐酸反应被认为是影响细菌生存及致龋性的重要因素。
The dissolution reactions of alkaline minerals in alkali solution were studied by the thermodynamic method, and the capacities of alkali released from alkaline minerals and their effect on alkalisilica reactions (ASR) were analyzed also.
应用热力学方法探讨了298K时钾长石、钠长石、霞石等含碱矿物在碱性环境下的碱析出能力,并对这些含碱矿物分解析出的碱对碱硅酸反应的影响进行了讨论。
Results indicate that the mechanism for controlling alkalisilica reaction expansion with LiOH is mainly due to the formation of lithium-containing less-expansive product around aggregate and the protection of the reactive aggregate by the lithium-containing.
研究了沸石化珍珠岩混凝土在KOH,LiOH溶液中压蒸膨胀行为,通过扫描电镜和能量散射谱对产物的形貌和组成进行了分析,说明LiOH抑制碱硅酸反应膨胀的机理主要是在集料周围形成了含锂盐的非膨胀性产物,含锂产物层的形成对活性集料起保护作用而阻止了碱的进一步侵蚀。
The modified zeolite with higher alkaline cations exchange capacity was produced through modification of natural zeolite, with which the concentration of soluble alkaline in concrete was decreased considerably, and the alkalisilica reaction (ASR) controlled consequently.
ASTMC441实验表明:利用改性沸石等量取代水泥5%可将碱硅酸反应引起的膨胀降低到0。
The effect of two kinds of alkali-bearing aggregates, nepheline syenite and alaskite on alkali–silica reaction(ASR) were studied using a new accelated test method, by which specimens were cured in steam at 80 ℃.
采用80℃蒸汽养护快速实验方法,研究了2种不同类型含碱集料——霞石正长岩和白岗岩对碱–硅酸反应的影响,并通过在150℃不同的碱溶液中压蒸集料的方法,对含碱集料的析碱机理进行了分析。
The expansion and micro-cracks of the mortar with composite mineral admixtures (fly ash, zeolite and slag) due to the alkali-silica reaction (ASR) are studied.
通过研究含有粉煤灰、沸石和矿渣的水泥胶砂试样因碱-硅酸反应所引起的膨胀和微观开裂特征表明:复合矿物材料(粉煤灰、沸石和矿渣)在低碱水泥和高活性集料中并不能完全消除水泥胶砂试样中的碱-硅酸反应,但减少了胶砂试样的膨胀率和膨胀破坏;且随着复合材料的增加,胶砂试样的膨胀率和膨胀破坏下降,微观结构得到改善。
The natural calcareous limestone is used as aggregate with alkali reactivity,the effect of composites of natural zeolite with fly ash,granulated blastfurnace slag and silica fume on alkali-silica reaction(ASR) accords to the testing method of ASTM C1260.
采用天然碱活性石灰质骨料,按照快速砂浆棒法(ASTM C1260),研究了天然沸石分别与粉煤灰、矿渣和硅灰的复合对碱-硅酸反应(ASR)的影响。
As a representative alkaline aggregate, nepheline was selected and the effect of it on the expansion of alkali-silica reaction was studied.
以霞石正长岩为代表,研究了含碱集料对碱-硅酸反应膨胀的影响。