Straw/ash magnesium-oxy-chloride cement hollow slat or hollow building block and preparation method thereof
A technology of magnesium oxychloride cement and hollow slabs, applied in cement mixing devices, clay preparation devices, chemical instruments and methods, etc., can solve problems such as poor water resistance, improve thermal insulation performance, reduce environmental burden, and be easy to purchase Effect
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[0026] A straw / ash magnesium cement hollow slab / hollow block and a preparation method thereof, the steps are as follows:
[0027] (1) halogen sheet is mixed with the magnesium chloride solution of mass fraction 25%-30%;
[0028] (2) Select ash and slag (such as fly ash, slag, silica fume any one or a mixture of any several) and modifier phosphate (including potassium dihydrogen phosphate, ammonium dihydrogen phosphate, sodium hydrogen phosphate , magnesium phosphate, etc.), boric acid or sodium borate modifier, etc.;
[0029] (3) According to MgO and MgCl 2 The mass ratio of 5:1-6:1 (according to MgCl 2 MgCl in solution 2 The ratio of the mass of magnesium oxide to the mass of magnesium oxide), the ash residue accounts for 10%-30% of the MgO mass, and the phosphate modifier accounts for 0.5%-2% of the MgO mass. MgO, MgCl 2 , ash and modifier are mixed uniformly to prepare magnesium oxychloride cement cementitious material;
Embodiment 1
[0032] Embodiment 1: select raw material, MgO and MgCl according to above-mentioned characteristic steps 2 The mass ratio is 5:1, the ash (fly ash) dosage is 10% (accounting for MgO mass percentage), the straw volume dosage is 10% (accounting for total volume percentage), modifier potassium dihydrogen phosphate The dosage is 1% (accounting for the percentage of MgO mass). According to the above steps, the magnesium oxychloride cement cementitious material is formulated and prepared, water is added and stirred, and molds are installed.
[0033] The molded specimens were placed under natural conditions and cured for 28 days to measure their strength and conduct a water resistance test. The results show that the 28d flexural strength of the specimen is above 10MPa, the 28d compressive strength is 50MPa, and the softening coefficient after soaking in water for 28d is above 0.81.
[0034] At the same time, in this example, the magnesium oxychloride cement cementitious material wi...
Embodiment 2
[0035] Embodiment 2: choose raw material, MgO and MgCl according to above-mentioned characteristic steps 2 The mass ratio is 5:1, the ash (fly ash) content is 10% (accounting for MgO mass percentage), the straw volume content is 30% (accounting for the total ratio volume percentage), modifier phosphoric acid di The dosing amount of potassium hydrogen is 1% (accounting for the percentage of MgO mass). According to the above steps, the magnesium oxychloride cement cementitious material is formulated and prepared, water is added and stirred, and molds are installed.
[0036] The molded specimens were preserved under natural conditions, and their bulk density, strength, water resistance and thermal conductivity were measured. The results show that the dry bulk density of the specimen is 1400kg / m 3 , the 28d flexural strength of the specimen is above 9MPa, the 28d compressive strength is above 14MPa, the thermal conductivity is 0.22w / (m·k), and the softening coefficient after soa...
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